Updated on 2024/10/30

写真a

 
NAGAYAMA Tsutomu
 
Organization
Research Field in Engineering, Science and Engineering Area Graduate School of Science and Engineering (Engineering) Department of Engineering Electrical and Electronics Engineering Program Assistant Professor
Title
Assistant Professor
Homepage
https://www.eee.kagoshima-u.ac.jp/~t-nagayama/
External link

Degree

  • 博士(工学) ( 2016.3   山口大学 )

Research Interests

  • Transformation Electromagnetics

  • Metamaterials

  • Metasurfaces

  • Transformation Acoustics

  • Acoustic Metamaterials

  • Acoustic Metasurfaces

Research Areas

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Electron device and electronic equipment  / Metamaterials, Invisible cloaks, Transformation Electromagnetics, Metasurfaces

  • Others / Others  / Acoustic Metamaterials, Acoustic Cloaks, Transformation Acoustics, Acoustic Metasurfaces

  • Nanotechnology/Materials / Applied condensed matter physics

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Electron device and electronic equipment

Research History

  • Kagoshima University   Research Field in Engineering, Science and Engineering Area Graduate School of Science and Engineering (Engineering) Department of Engineering Electrical and Electronics Engineering Program   Assistant Professor

    2020.4

  • Kagoshima University   Research Field in Engineering, Science and Engineering Area Graduate School of Science and Engineering (Engineering) Electrical and Electronics Engineering Course   Assistant Professor

    2016.4 - 2020.3

Professional Memberships

  • IEEE

    2013.1

  • 電子情報通信学会

    2010.10

  • APS

    2018.3

  • 電気学会

    2010.12

  • 応用物理学会

    2018.6

 

Papers

  • S. Toyomitsu, T. Nagayama, S. Fukushima, T. Watanabe .  (Accepted)Design of a Topological Waveguide Using Two Types of Rhombic Unit Cell Structures Mutually Shifted by Half-period .  Asia-Pacific Microwave Conference Proceedings, APMC   1 - 3   2024.11(Accepted)Design of a Topological Waveguide Using Two Types of Rhombic Unit Cell Structures Mutually Shifted by Half-periodReviewed

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    Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)  

  • Tsutomu Nagayama .  Two Types of Rhombic Distributed Transmission-Line Models for Designing Topological Waveguides .  European Microwave Conference 2024 (EuMC 2024)   397 - 400   2024.9Two Types of Rhombic Distributed Transmission-Line Models for Designing Topological WaveguidesReviewed International journal

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    Authorship：Lead author,　Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)  

  • T. Nagayama .  Design Method for Broadband Metasurfaces with a Function of a Two-dimensional Axicon Lens .  2024 PhotonIcs & Electromagnetics Research Symposium   1 - 6   2024.4Reviewed International journal

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    Authorship：Lead author,　Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：2024 PhotonIcs & Electromagnetics Research Symposium  

    The design method for broadband metasurfaces with a function of a two-dimensional (2-D) sub-wavelength axicon lens is proposed. The one-dimensional (1-D) transmission-line (TL) model is used for the design and the concept is explained based on the theory. The design formula is derived and TL parameters are calculated by determining the condition of the lens like the refraction angle or the aperture size. A metasurface is composed of the 1-D TL model and circuit simulations are carried out with a SPICE simulator. The complex voltage distributions are calculated and the results show that the designed metasurface generates a Bessel zone and has a function of a 2-D axicon lens.

    DOI： 10.1109/PIERS62282.2024.10618565

    Scopus

  • Tsutomu Nagayama .  Design Method for Topological Waveguides by Using Two Types of Rhombic Composite Right/Left-Handed Transmission-Lines .  2023 Asia-Pacific Microwave Conference (APMC)   98 - 100   2023.12Reviewed International journal

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    Authorship：Lead author,　Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

    The design method for topological waveguides is presented based on the transmission-line (TL) theory of metamaterials. Two types of rhombic composite right/left-handed (CRLH) TLs are proposed and the conditions for designing topological waveguides are stated. Circuit parameters are chosen according to the conditions and those frequency dispersion characteristics are calculated by using the theoretical formulas. The designed two rhombic CRLH TLs are arranged periodically at two areas, respectively, and a topological waveguide is constituted on the zigzag boundary between those. The operation is verified by circuit simulations and the validity of the design method is demonstrated from the results.

    DOI： 10.1109/apmc57107.2023.10439689

    Scopus

  • T. Kashiwaki, S. Fukushima, T. Watanabe, T. Nagayama .  Spatial Distribution Observation of Sonoluminescence from Acoustic Cavitation Bubbles in Electric-Field-Applied Water .  28th Microoptics Conference (MOC2023)   1 - 2   2023.9Reviewed International journal

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    We have observed spatial distribution of sonoluminescence from acoustic cavitation bubbles in electric-field-Applied water by using a commercial digital camera. Luminescence included two colors of bluish white and reddish orange and had a column shape. Luminescent characteristics changed when an electric field was applied to the water.

    DOI： 10.23919/MOC58607.2023.10302916

    Scopus

  • Tsutomu Nagayama .  Design Method for Negative Refractive Index Metasurface Lenses by Using a One-Dimensional Distributed Transmission-Line Model .  2023 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT)   76 - 78   2023.8Reviewed International journal

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    Authorship：Lead author,　Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

    A design method for negative refractive index (NRI) metasurface lenses whose thickness is thinner than that of conventional NRI metamaterial ones is presented. A one-dimensional distributed transmission-line model is introduced to the design and the design formulas for determining the line length and the characteristic impedance are shown. As an example, a NRI metasurface lens operating at 1.85 GHz is designed based on the proposed method. A circuit simulation is carried out and complex voltage distributions are calculated to confirm the focusing operation of the designed lens whose thickness is sufficiently thinner than the wavelength.

    DOI： 10.1109/RFIT58767.2023.10243384

    Scopus

  • I. Suhara, T. Nagayama, S. Fukushima, T. Watanabe .  Design of a Broadband Flat Metasurface Lens by Using One-Dimensional Meander Microstrip-Line Structures .  2023 Photonics & Electromagnetics Research Symposium (PIERS)   1899 - 1904   2023.7Reviewed International journal

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    Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

    We design a broadband flat metasurface lens whose thickness is much thinner than the wavelength. The concept with one-dimensional (1-D) transmission-line model is recalled and 1-D meander microstrip-line structures are used for the design. Determining the specification of the lens, the line length is calculated based on the design formula. The eigenfrequency analysis is carried out to modify the error of electrical length from the theoretical value, and the line length is optimized. A metasurface lens is constituted with the structures and full-wave simulations are performed to confirm the broadband operation. It is seen from the results that the designed lens can make a focus at any frequency.

    DOI： 10.1109/piers59004.2023.10221359

    Scopus

  • Takato Teshima, Seiji Fukushima, Tsutomu Nagayama, Toshio Watanabe, Hirotsugu Kikuchi .  Light Beam Steering Demonstration by Using Liquid Crystal Loaded Metasurface .  2023 Photonics & Electromagnetics Research Symposium (PIERS)   1895 - 1898   2023.7Reviewed International journal

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    We proposed two types of LC-loaded metasurface devices having a simple cuboid and a cuboid with a chevron-waveguide structure as a unit cell and showed simulation results on light beam steering. According to the results, it has been confirmed numerically that the light steers at the metasurface devices and its angle can be controlled by change of refractive index. By employing the cuboid with a chevron-waveguide structure, the same steering angle was achieved at lower refractive index change.

    DOI： 10.1109/piers59004.2023.10221529

    Scopus

  • T. Nagayama .  Design Method of Broadband Metasurfaces for Generating a Two-dimensional Gaussian Beam from a Normal Incident Plane Wave with the Same Amplitude Distribution .  2023 Photonics & Electromagnetics Research Symposium (PIERS)   1173 - 1179   2023.7Reviewed International journal

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    The design method of broadband metasurfaces for generating a two-dimensional (2-D) Gaussian beam from a normal incident plane wave with the same amplitude distribution is presented based on the one-dimensional transmission-line model. The formula of the characteristic impedance of the model is derived according to the concept and an electromagnetic metasurface is designed by using the model with the parameters determined from the formula. Circuit simulations are carried out to confirm the validity of the design with the model. The results show that the designed metasurface generates a 2-D Gaussian beam from an incident plane wave and also has the broadband characteristics.

    DOI： 10.1109/piers59004.2023.10221277

    Scopus

  • Izumi Suhara, Tsutomu Nagayama, Toshio Watanabe, Seiji Fukushima .  Implementation Method for Broadband Metasurfaces Based on a Distributed Transmission-Line Model .  2022 IEEE International RF and Microwave Conference (RFM)   1 - 4   2022.12Reviewed International journal

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    We propose an implementation method for broadband metasurfaces based on a one-dimensional distributed transmission-line model. Five types of one-dimensional meander microstrip-line structures are proposed and a metasurface refracting a normal incident plane wave with a 20-degree angle is implemented with those. Line length of each structure is determined from the theoretical formula of the model and the error from the theoretical value is modified by eigenfrequency analysis. Full-wave simulations are carried out, and the broadband refracting operations and the validity of the proposed method are confirmed.

    DOI： 10.1109/RFM56185.2022.10065054

    Scopus

  • Tsutomu Nagayama .  Design Method for Broadband Invisible Cloaks by Using Straight and Meander Transmission-Lines .  2022 IEEE International RF and Microwave Conference (RFM)   1 - 4   2022.12Reviewed International journal

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    Authorship：Lead author,　Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)  

    A design method for transmission-type broadband invisible cloaks is presented. An invisible cloak for hiding a much larger rhombus area than the wavelength is designed by using straight and meander transmission-lines and those line lengths are calculated from theoretical formulas. Circuit simulations are carried out and the broadband operations of the designed invisible cloak are demonstrated from the calculated results of the complex voltage distributions.

    DOI： 10.1109/RFM56185.2022.10065136

    Scopus

  • Yuki Sonoda, Tsutomu Nagayama, Toshio Watanabe, Seiji Fukushima .  Design of a Broadband Carpet Cloak for Hiding Larger Objects than the Wavelength by Using One-Dimensional Meander Microstrip-Line Structures .  Asia-Pacific Microwave Conference Proceedings, APMC2022-November   76 - 78   2022.11Reviewed International journal

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    Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

    Four types of one-dimensional (1-D) meander microstrip-line structures are proposed in order to realize 1-D distributed transmission-line models for the design of carpet cloaks that can hide larger objects than the wavelength. The line length of the proposed structures is determined based on the design theory of the model and a carpet cloak for hiding periodically arranged large triangle areas on a flat surface is designed by using the proposed structures. Full-wave simulations are performed, and the broadband operations and the validity of the design are demonstrated from the calculated results.

    DOI： 10.23919/apmc55665.2022.9999886

    Scopus

  • Ibuki Takegami, Tsutomu Nagayama, Seiji Fukushima, Toshio Watanabe .  Design Method of Acoustic Metamaterials for Negative Refractive Index Acoustic Lenses Based on the Transmission-Line Theory .  Crystals12 ( 11 ) 1 - 11   2022.11Reviewed International journal

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    The design theory for electromagnetic metamaterials with negative refractive indices by using a distributed transmission-line model is introduced to the design of acoustic metamaterials, and a negative refractive index (NRI) acoustic lens is designed theoretically. Adjustments to the negative refractive indices of metamaterials have been carried out by calculations with numerical simulators in conventional design methods. As the results show, many calculations are needed to determine the shape of the unit structures and there are issues in that it is difficult to design those rigorously, meaning that limitations regarding the degree of freedom in the designs are many. On the other hand, the transmission-line model can rigorously design the unit cell structures of both the negative refractive index metamaterials and the background media with the positive refractive indices by calculations with the design formulas and modifying the error from the theory with a small calculation. In this paper, a meander acoustic waveguide unit cell structure is proposed in order to realize a structure with characteristics equivalent to the model, and the waveguide width and length for realizing an NRI acoustic lens are determined from the design formula of the model. The frequency dispersion characteristics of the proposed structure are also computed by eigenvalue analysis and the error in the waveguide length from the theoretical value is modified by a minor adjustment of the waveguide length. In addition, the NRI acoustic lens is constituted by periodically arranging the proposed unit cell structure with the calculated parameters, and the full-wave simulations are carried out to show the validity of the design theory. The results show that the designed lens operates at 2.5 kHz.

    DOI： 10.3390/cryst12111655

    Scopus

  • Tsutomu Nagayama, Akihiro Toshima, Seiji Fukushima, Toshio Watanabe .  Two-Dimensional Distributed Transmission-Line Models for Broadband Full-Tensor Anisotropic Acoustic Metamaterials Based on Transformation Acoustics .  Crystals12 ( 11 ) 1 - 17   2022.10Reviewed International journal

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Crystals  

    We propose the design method for broadband acoustic metamaterials based on the concept of transformation acoustics. Two-dimensional distributed transmission-line (TL) models for full-tensor anisotropic electromagnetic metamaterials are applied to full-tensor anisotropic acoustic metamaterials and the design formulas are shown to uniquely determine the structural parameters of the unit cells. Two-dimensional acoustic waveguide unit cell structures for realizing the TL models are proposed and an acoustic carpet cloak and an acoustic illusion medium are designed according to the introduced theory. The complex sound pressure distributions in the acoustic waveguides of the unit cells are calculated by full-wave simulations to verify the validity of the proposed method, and the broadband operations of the designed carpet cloak and illusion medium are confirmed from the results.

    DOI： 10.3390/cryst12111557

    Scopus

  • Tomoya Nakagawa, Tsutomu Nagayama, Seiji Fukushima, Toshio Watanabe .  Constitution Method for Broadband Acoustic Metamaterials Based on the Design Theory of a One-Dimensional Distributed Transmission-Line Model .  Crystals12 ( 11 ) 1 - 11   2022.10Reviewed International journal

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    A method for realizing broadband acoustic metasurfaces composed of a one-dimensional distributed transmission-line model is proposed. There are no design formulas for determining the structural parameters of the structure constituting acoustic metasurfaces in the conventional method, and therefore parameter extractions by means of many calculations with numerical simulations are needed to realize acoustic metasurfaces. There are also narrow band operations or impedance matching problems. On the other hand, this paper shows that we can design broadband acoustic metasurfaces by determining the structural parameters with the design formulas of the model without many calculations. An acoustic metasurface that refracts incident plane waves at an angle of 20 degrees is first designed by using one-dimensional meander acoustic waveguide structures equivalent to the model, and these structural parameters are determined by the design formulas of the model and the modifications of the error from the theory. Full-wave simulations are performed, and the broadband operations and the validity of the design theory are shown from these results. Furthermore, a broadband acoustic flat lens is designed with the proposed structures as an example of the application of the proposed method, and these operations are also demonstrated by similar full-wave simulations.

    DOI： 10.3390/cryst12111528

    Scopus

  • M. Kawasako, T. Watanabe, T. Nagayama, S. Fukushima .  Scalability of Multi-Stage Nested Mach-Zehnder Interferometer Optical Switch with Phase Generating Couplers .  Advances in Science, Technology and Engineering Systems Journal (ASTES)7 ( 4 ) 140 - 146   2022.8Reviewed International journal

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：ASTES Journal  

    DOI： 10.25046/aj070418

    DOI： 10.25046/aj070418

  • T. Kiritoshi, T. Watanabe, T. Nagayama, S. Fukushima .  Coupling characteristics of a mode multi/demultiplexer with a vertically stacked asymmetric directional coupler .  27th Optoelectronics and Communications Conference / International Conference on Photonics in Switching and Computing (OECC/PSC 2022)   2022.7Reviewed International journal

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    We show the coupling characteristics of a mode multi/demultiplexer (MUX/DEMUX) with a vertically stacked asymmetric directional coupler. Designed multilayer 4-mode MUX/DEMUX has higher coupling efficiency than the conventional in-plane mode MUX/DEMUX.

    DOI： 10.23919/OECC/PSC53152.2022.9849938

    DOI： 10.23919/OECC/PSC53152.2022.9849938

    Scopus

  • T. Nagayama .  Design Method of Broadband Acoustic Metasurfaces Based on the Transmission-line Theory .  2022 Photonics & Electromagnetics Research Symposium (PIERS)   432 - 438   2022.4Reviewed International journal

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    DOI： 10.1109/PIERS55526.2022.9793268

    Scopus

  • T. Nagayama, S. Fukushima, T. Watanabe .  Design Method of Broadband Flat Metasurface Lenses by Using an One-Dimensional Distributed Transmission-Line Model .  2021 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (APS/URSI)   403 - 404   2021.12Reviewed International journal

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

    We propose a design method for broadband flat metasurface lenses by using an one-dimensional distributed transmission-line model. The design formula of the line length is shown and how to determine the characteristic impedance is stated. Circuit simulations are carried out to confirm the validity of the design method and broadband operations of a designed flat metasurface lens are demonstrated.

    DOI： 10.1109/aps/ursi47566.2021.9704148

    Scopus

  • Tsutomu Nagayama, Akihiro Toshima, Yuki Sonoda, Seiji Fukushima, Toshio Watanabe .  Design of a Broadband Carpet Cloak by Using an One-Dimensional Distributed Transmission-Line Model .  2021 IEEE Asia-Pacific Microwave Conference (APMC) 2021-November   353 - 355   2021.12Reviewed International journal

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)  

    DOI： 10.1109/APMC52720.2021.9661681

    Scopus

  • Akihiro Toshima, Tsutomu Nagayama, Seiji Fukushima, Toshio Watanabe .  Acoustic Illusion Medium Mimicking Scattered Waves of a Groove on a Flat Surface Based on Transformation Acoustics .  2021 Photonics & Electromagnetics Research Symposium (PIERS)2021-November   2587 - 2592   2021.11Reviewed International journal

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    Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

    An acoustic illusion medium for mimicking a groove on a flat surface is designed by using the equivalent circuit models for full-tensor anisotropic acoustic metamaterials. The concept is explained according to the theory of transformation acoustics and its circuit parameters are calculated from the design formulas. The mimicking operations of the normal and the oblique incidence cases are shown by circuit simulations with a SPICE simulator to confirm the validity of the design theory. In addition, the radar cross sections (RCSs) are compared with those of the groove to evaluate the operations.

    DOI： 10.1109/PIERS53385.2021.9694828

    Scopus

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  • Seiji Fukushima, Satoshi Yanagihara, Toshio Watanabe, Tsutomu Nagayama .  Light Modulation Enhancement by using an Impedance Matching Scheme for a Subcarrier Multiplexed Light Transmitter .  Advances in Science, Technology and Engineering Systems Journal (ASTES)6 ( 6 ) 7 - 11   2021.11Reviewed International journal

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.25046/aj060602

  • Masayuki Kawasako, Toshio Watanabe, Tsutomu Nagayama, Seiji Fukushima .  4-Stage Mach-Zehnder Interferometer Optical Switch with Phase Generating Couplers .  2021 26th Microoptics Conference (MOC)   1 - 2   2021.9Reviewed International journal

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    Language：English   Publishing type：Research paper (international conference proceedings)  

    DOI： 10.23919/MOC52031.2021.9598066

    Scopus

  • Truncated spot size converters for silicon photonic wire waveguides .  26th Optoelectronics and Communications Conference (OECC 2021)   1 - 3   2021.7Reviewed International journal

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    We examined light propagation along the spot size converter of silicon photonic wire waveguides, and show there are two maxima in coupling efficiency. An optimal design was given in terms of compactness and high efficiency by changing its dimension and shape.

    DOI： 10.1364/OECC.2021.W4F.3

    Scopus

  • Tsutomu Nagayama .  Design method for broadband metasurfaces by using a simple non-resonant one-dimensional transmission-line model .  2021 2nd International Conference for Emerging Technology, INCET 2021   1 - 4   2021.5Reviewed International journal

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

    DOI： 10.1109/INCET51464.2021.9456227

    Scopus

  • Tsutomu Nagayama, Shohei Aoyagi, Seiji Fukushima, Toshio Watanabe .  Design of a Zero-Index Metamaterial for Invisible Cloaks by Using an Unit Cell Structure Equivalent to a Distributed Transmission-Line Model .  IEICE TRANSACTIONS on Electronics (Japanese Edition)J104-C ( 1 ) 33 - 42   2021.1Reviewed

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    Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)  

  • 永山 務, 福島 誠治, 渡邉 俊夫 .  分布定数線路モデルと等価な単位セル構造による透明マントのための屈折率0媒質の設計 .  電子情報通信学会論文誌J104-C   33 - 42   2021分布定数線路モデルと等価な単位セル構造による透明マントのための屈折率0媒質の設計Reviewed International journal

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  • Tsutomu Nagayama, Seiji Fukushima, Toshio Watanabe .  Two-Dimensional Full-Tensor Anisotropic Metamaterials with the Impedance of Free Space for Transformation Electromagnetics .    2020-December   134 - 136   2020.12Reviewed International journal

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)  

    DOI： 10.1109/APMC47863.2020.9331685

    Scopus

  • Satoshi Yanagihara, Seiji Fukushima, Toshio Watanabe, Tsutomu Nagayama .  Impedance-matched Feedline for a Semiconductor Laser Emitting Subcarrier Multiplexed Light .  2020 Opto-Electronics and Communications Conference (OECC)   1 - 3   2020.10Reviewed International journal

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    Language：English   Publishing type：Research paper (international conference proceedings)  

    DOI： 10.1109/OECC48412.2020.9273591

    Scopus

  • Tsutomu Nagayama, Seiji Fukushima, Toshio Watanabe .  Design Method for Negative Refractive Index Metamaterials by Using a Distributed Transmission-Line Model .  2020 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT)   58 - 60   2020.9Reviewed International journal

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

    A design method for negative refractive index (NRI) metamaterials is proposed based on the transmission-line (TL) approach. A distributed TL model is introduced to the design and the design formulas are shown. A NRI lens operating at 3.85 GHz is designed with the model as an example. The operation and the validity of the design method are exhibited from the calculated results by circuit simulations with a SPICE simulator.

    DOI： 10.1109/RFIT49453.2020.9226180

    Scopus

  • Tsutomu Nagayama .  Equivalent Circuit Models for Full-Tensor Anisotropic Composite Right/Left-Handed Metamaterials .  2020 IEEE/MTT-S International Microwave Symposium (IMS)2020-August   317 - 320   2020.8Reviewed International journal

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

    Equivalent circuit models for two-dimensional (2-D) full-tensor anisotropic composite right/left-handed metamaterials are presented to design NRI metamaterials based on transformation electromagnetics for manipulating backword waves according to the transformed coordinate system. Relations of circuit parameters and material parameters are shown by comparing circuit equations with Maxwell's equations. As an example, a 2-D full-tensor negative refractive index (NRI) lens based on transformation electromagnetics are designed by using the equivalent circuit models. The full-tensor NRI lens can shift positions of the focus and the refocus according to the coordinate system transformed from the original one embedding a general 2-D NRI lens. Its operations are shown by circuit simulations with a SPICE simulator.

    DOI： 10.1109/IMS30576.2020.9223938

    Scopus

  • Kohei Tasaki, Mitsuru Tokumaru, Toshio Watanabe, Tsutomu Nagayama, Seiji Fukushima .  Nested Mach–Zehnder interferometer optical switch with phase generating couplers .  Japanese Journal of Applied Physics59 ( SOOB04 ) 1 - 4   2020.5Reviewed International journal

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：IOP Publishing  

    DOI： 10.35848/1347-4065/ab8f09

    Scopus

  • Tsutomu Nagayama, Shohei Kakoi, Seiji Fukushima, Toshio Watanabe .  Transmission-Line Approach to Zero-Index Materials for Invisible Cloaks .  2019 IEEE Asia-Pacific Microwave Conference (APMC)2019-December   81 - 83   2019.12Reviewed International journal

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

    A design method for two-dimensional (2-D) zero-index materials (ZIMs) is presented based on the transmission-line (TL) approach in order to realize invisible cloaks for hiding objects. A simple 2-D distributed TL model is proposed and the formula to calculate the dispersion characteristics is theoretically derived. It is shown from the calculated dispersion characteristics that a Dirac cone is always formed at the T-point without adjustments of the unit cell for the degeneration of propagation modes and ZIMs can be easily designed with the proposed model. In addition, a ZIM operating at 5 GHz is designed with the proposed model, and its cloaking operations and the validity of the design theory are demonstrated by circuit simulations.

    DOI： 10.1109/APMC46564.2019.9038216

    Scopus

  • Tsutomu Nagayama, Shuntaro Uchida, Seiji Fukushima, Toshio Watanabe .  Equivalent Circuit Models for Two-dimensional Full-tensor Anisotropic Acoustic Metamaterials .  2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall)   989 - 995   2019.12Reviewed International journal

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

    We extend the theory of equivalent circuit models for two-dimensional (2-D) full-tensor anisotropic electromagnetic metamaterials and introduce the design method with equivalent circuit models to designs of 2-D full-tensor anisotropic acoustic metamaterials. Relations of circuit parameters and material parameters including the off-diagonal components of the mass density tensor are revealed from the duality of circuit equations and acoustic equations. A 2D acoustic carpet cloak for hiding a bump on a flat surface is designed with equivalent circuit models to confirm the validity of the theory. Circuit simulations are carried out and the voltage distributions and the radar cross sections are compared with those for the cases with the flat surface and the bump. Those results show the angle independent cloaking operations of the designed acoustic carpet cloak.

    DOI： 10.1109/PIERS-Fall48861.2019.9021320

    Scopus

  • Tsutomu Nagayama, Atsushi Sanada .  Broadband transmission-line illusions based on transformation electromagnetics .  EPJ Applied Metamaterials6 ( 23 ) 1 - 10   2019.11Invited Reviewed International journal

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：EPJ Applied Metamaterials  

    © T. Nagayama and A. Sanada, published by EDP Sciences, 2019. We demonstrate broadband transmission-line illusions based on transformation electromagnetics at microwave frequencies by using the distributed full-tensor anisotropic medium. Due to an intrinsic nature of the non-resonant unit cell of the medium, the illusions operate from DC to an upper limit frequency where the homogeneous medium approximation holds. Two-dimensional groove and bump illusion media mimicking scattered waves by an original groove and a bump are designed. Their broadband and incident angle independent operations are confirmed by circuit simulations. The groove illusion medium is implemented on a dielectric substrate with microstrip-line technology, and it is confirmed experimentally by near-field measurements that the illusion medium well mimics scattered waves by the original groove in the broadband frequency range from 2.60 GHz to 4.65 GHz.

    DOI： 10.1051/epjam/2019018

    Scopus

  • Toshio Watanabe, Kohei Tasaki, Tsutomu Nagayama, Seiji Fukushima .  Nested Mach-Zehnder Interferometer Optical Switch with Low Crosstalk .  2019 24th Microoptics Conference (MOC)   234 - 235   2019.11Reviewed International journal

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

    We demonstrate a 1 times mathrm {N} nested Mach-Zehnder interferometer optical switch configuration with low crosstalk regardless of coupling ratio deviation. It also has an inherent symmetry which helps a scale expansion of its port count.

    DOI： 10.23919/MOC46630.2019.8982851

    Scopus

  • Shuhei Shimada, Toshio Watanabe, Tsutomu Nagayama, Seiji Fukushima .  Design of arrayed-waveguide optical switch employing window function for crosstalk reduction .  Japanese Journal of Applied Physics58 ( SJJB03 ) 1 - 4   2019.7Reviewed International journal

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：IOP Publishing  

    DOI： 10.7567/1347-4065/ab27b1

    Scopus

  • Wataru Yamauchi, Toshio Watanabe, Tsutomu Nagayama, Seiii Fukushima .  Joint-Switching Architecture Utilizing Waveguide-Based Multicast Switch in CDC-ROADM for Multi-Core Fiber Networks .  2019 24th OptoElectronics and Communications Conference (OECC) and 2019 International Conference on Photonics in Switching and Computing (PSC)   1 - 3   2019.6Reviewed International journal

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

    We propose a joint-switching architecture utilizing waveguide-based multicast switches in a colorless, directionless and contentionless ROADM node for multi-core fiber networks cost-effectively.

    DOI： 10.23919/PS.2019.8817853

    Scopus

  • Yuma Takano, Tsutomu Nagayama, Atsushi Sanada .  Constant Permeability Design of Cylindrical Invisibility Cloaks with Hyperbolic Coordinate Transformation Based on Transformation Electromagnetics .  2018 IEEE Asia Pacific Microwave Conference (APMC)2018-November   1 - 4   2018.11Reviewed International journal

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    Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)  

    DOI： 10.23919/APMC.2018.8617298

    Scopus

  • Tsutomu Nagayama, Seiji Fukushima, Toshio Watanabe, Atsushi Sanada .  Flat Retroreflector Mimicking a Cylindrical Retroreflector with a Function of a Luneburg Lens .  2018 IEEE Asia Pacific Microwave Conference (APMC)2018-November   1055 - 1057   2018.11Reviewed International journal

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)  

    DOI： 10.23919/APMC.2018.8617161

    Scopus

  • Shuhei Shimada, Toshio Watanabe, Tsutomu Nagayama, Seiji Fukushima .  Design of arrayed-waveguide optical switch employing window function .  2018 23th Microoptics Conference (MOC)   2018.10Design of arrayed-waveguide optical switch employing window functionReviewed International journal

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    Language：English   Publishing type：Research paper (international conference proceedings)  

  • Seiji Fukushima, Tomonori Ueozno, Sotaro Ohshima, Toshio Watanabe, Tsutomu Nagayama .  Optoelectronic Frequency Conversion Employing an Electro-Absorption Modulated Laser for a Cube Satellite Earth Station .  2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama)   257 - 261   2018.8Reviewed International journal

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    Language：English   Publishing type：Research paper (international conference proceedings)  

    DOI： 10.23919/PIERS.2018.8598042

    Scopus

  • Tsutomu Nagayama, Atsushi Sanada .  Coordinate transformation resonators .  Applied Physics Letters112 ( 23 ) 234101-1 - 234101-4   2018.6Reviewed International journal

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1063/1.5027017

    Scopus

  • Tsutomu Nagayama, Seiji Fukushima, Toshio Watanabe .  2-D Flat Lenses Based on Transformation Electromagnetics .  2018 Thailand-Japan Microwave   1 - 4   2018.62-D Flat Lenses Based on Transformation ElectromagneticsReviewed International journal

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)  

  • Tomonori Uezono, Seiji Fukushima, Toshio Watanabe, Tsutomu Nagayama .  Link Length Analysis of a Radio-on-Fiber System for a Cube Satellite Earth Station .  Annual Conference on Engineering and Applied Science (ACEAT)   2017.11Link Length Analysis of a Radio-on-Fiber System for a Cube Satellite Earth StationReviewed International journal

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    Language：English   Publishing type：Research paper (international conference proceedings)  

  • Tsutomu Nagayama, Seiji Fukushima, Toshio Watanabe .  Flat focusing reflector simulation employing circuit models .  2017 IEEE Asia Pacific Microwave Conference (APMC)   1 - 4   2017.11Reviewed International journal

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)  

    DOI： 10.1109/APMC.2017.8251709

    Scopus

  • Tsutomu Nagayama .  (Invited)Distributed Full-Tensor Anisotropic Metamaterials for Implementing Coordinate Transformation Media .  Proceedings of The 2017 Vietnam - Japan Microwave   89 - 92   2017.6(Invited)Distributed Full-Tensor Anisotropic Metamaterials for Implementing Coordinate Transformation MediaInvited International journal

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    Authorship：Lead author,　Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Proceedings of The 2017 Vietnam - Japan Microwave  

  • Tsutomu Nagayama, Atsushi Sanada, Seiji Fukushima, Toshio Watanabe .  Flat Retroreflector Based on Transformation Electromagnetics .  2016 International Conference on Advanced Technologies for Communications (ATC)   13 - 16   2016.10Reviewed International journal

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)  

    DOI： 10.1109/ATC.2016.7764759

    Scopus

  • Tsutomu Nagayama, Atsushi Sanada .  Illusion Medium Mimicking Scattered Waves of a Bump on a Flat Surface Based on Transformation Electromagnetics .  The 5th Advanced Lasers and Photon Sources (ALPS’16)   1 - 2   2016.5Illusion Medium Mimicking Scattered Waves of a Bump on a Flat Surface Based on Transformation ElectromagneticsReviewed International journal

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)  

  • Tsutomu Nagayama, Atsushi Sanada .  Planar Distributed Full-tensor Anisotropic Metamaterials for Transformation Electromagnetics .  IEEE Transactions on Microwave Theory and TechniquesMTT-63 ( 12 ) 3851 - 3861   2015.12Reviewed International journal

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1109/TMTT.2015.2487275

    Scopus

  • Atsushi Sanada, Tsutomu Nagayama .  Transmission Line Metamaterials for Transformation Electromagnetics .  2014 44th European Microwave Conference   965 - 967   2014.10Invited Reviewed International journal

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    Authorship：Last author   Language：English   Publishing type：Research paper (international conference proceedings)  

    DOI： 10.1109/EuMC.2014.6986597

    Scopus

  • Atsushi Sanada, Tsutomu Nagayama .  Transmission Line Approach to 2D Full-Tensor Anisotropic Metamaterials for Transformation Electromagnetics .  2014 International Conference on Electromagnetics in Advanced Applications (ICEAA)   804 - 805   2014.8Invited Reviewed International journal

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    Authorship：Last author   Language：English   Publishing type：Research paper (international conference proceedings)  

    DOI： 10.1109/ICEAA.2014.6903967

    Scopus

  • Tsutomu Nagayama, Atsushi Sanada .  Specular Reflection from a Sinusoidal Periodic Boundary by a Carpet Cloak of Invisibility .  2013 Asia-Pacific Microwave Conference Proceedings (APMC)   1209 - 1211   2013.11Reviewed International journal

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)  

    DOI： 10.1109/APMC.2013.6695073

    Scopus

  • Tsutomu Nagayama, Atsushi Sanada .  Physical Equivalent Circuit Model for 2D Full-Tensor Anisotropic Metamaterials .      1 - 3   2013.6Reviewed International journal

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)  

    DOI： 10.1109/MWSYM.2013.6697788

    Scopus

  • Atsushi Sanada, Tsutomu Nagayama .  Transmission line approach for transformation electromagnetics .  Proceedings of 2013 International Symposium on Electromagnetic Theory   336 - 337   2013.5Invited Reviewed International journal

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    Authorship：Last author   Language：English   Publishing type：Research paper (international conference proceedings)  

    Scopus

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Books

  • メタマテリアルの設計、作製と新材料、デバイス開発への応用

    永山務（ Role： Contributor ,  第７章 第４節 回路モデルを用いた変換音響学に基づく音響メタマテリアルの設計方法）

    (株)技術情報協会  2022.3  （ ISBN:9784861048760 ）

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    Responsible for pages：pp.444-451   Language：Japanese Book type：Scholarly book

  • 月刊マテリアルステージ 2021年8月号

    永山務（ Role： Contributor ,  特集3 音響メタマテリアル設計理論と音響透明マントへの応用）

    (株)技術情報協会  2021.8 

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    Responsible for pages：pp.83-88   Language：Japanese Book type：Scholarly book

MISC

  • 積層型非対称方向性結合器を用いたモード合分波器

    鍵本力, 渡邉俊夫, 永山務, 福島誠治

    2023年度(第76回） 電気・情報関係学会九州支部連合大会   2023.9

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    Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

  • マルチモード伝送可能な屈折率導波型フォトニック結晶ファイバ

    小田昇輝, 渡邉俊夫, 永山務, 福島誠治

    2023年度(第76回） 電気・情報関係学会九州支部連合大会   2023.9

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    Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

  • 中空コア光ファイバの群遅延特性

    井芹奎士郎, 渡邉俊夫, 永山務, 福島誠治

    2023年度(第76回） 電気・情報関係学会九州支部連合大会   2023.9

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    Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

  • 冗長性を持つ3段Clos光スイッチの回路構成

    永山諒, 渡邉俊夫, 永山務, 福島誠治

    2023年度(第76回） 電気・情報関係学会九州支部連合大会   2023.9

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    Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

  • 屈折率を制御したフォトニック結晶ファイバの特性

    稲光遥也, 渡邉俊夫, 永山務, 福島誠治

    2023年度(第76回） 電気・情報関係学会九州支部連合大会   2023.9

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    Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

  • 液晶メタサーフェスを用いた可変偏向器の検討(2)

    山下駿, 福島誠治, 永山務, 渡邉俊夫

    2023年度(第76回） 電気・情報関係学会九州支部連合大会   2023.9

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    Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

  • アバランシェ・フォトダイオードを用いた周波数逓倍

    平川 大凱, 福島 誠治, 渡邉 俊夫, 永山 務

    令和4年度電気学会九州支部沖縄支所講演会   10 - 12   2022.12

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    Authorship：Last author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

▼display all

Presentations

  • 鍵本力, 渡邉俊夫, 永山務, 福島誠治   積層型非対称方向性結合器を用いたモード合分波器  

    2023年度(第76回)電気・情報関係学会九州支部連合大会  2023.9 

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    Event date： 2023.9

    Language：Japanese   Presentation type：Oral presentation (general)  

  • 小田昇輝, 渡邉俊夫, 永山務, 福島誠治   マルチモード伝送可能な屈折率導波型フォトニック結晶ファイバ  

    2023年度(第76回)電気・情報関係学会九州支部連合大会  2023.9 

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    Event date： 2023.9

    Language：Japanese   Presentation type：Oral presentation (general)  

  • 井芹奎士郎, 渡邉俊夫, 永山務, 福島誠治   中空コア光ファイバの群遅延特性  

    2023年度(第76回)電気・情報関係学会九州支部連合大会  2023.9 

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    Event date： 2023.9

    Language：Japanese   Presentation type：Oral presentation (general)  

  • 永山諒, 渡邉俊夫, 永山務, 福島誠治   冗長性を持つ3段Clos光スイッチの回路構成  

    2023年度(第76回)電気・情報関係学会九州支部連合大会  2023.9 

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    Event date： 2023.9

    Language：Japanese   Presentation type：Oral presentation (general)  

  • 稲光遥也, 渡邉俊夫, 永山務, 福島誠治   屈折率を制御したフォトニック結晶ファイバの特性  

    2023年度(第76回)電気・情報関係学会九州支部連合大会  2023.9 

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    Event date： 2023.9

    Language：Japanese   Presentation type：Oral presentation (general)  

  • 山下駿, 福島誠治, 永山務, 渡邉俊夫   液晶メタサーフェスを用いた可変偏向器の検討(2)  

    2023年度(第76回)電気・情報関係学会九州支部連合大会  2023.9 

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    Event date： 2023.9

    Language：Japanese   Presentation type：Oral presentation (general)  

  • 平川 大凱，福島 誠治，渡邊 俊夫，永山 務   アバランシェ・フォトダイオードを用いた周波数逓倍  

    令和4年度電気学会九州支部沖縄支所講演会  2022.12  電気学会九州支部沖縄支所

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    Event date： 2022.12

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：琉球大学(Online)  

  • 手嶋崇人, 福島誠治, 永山務, 渡邉俊夫   液晶メタサーフェスを用いた可変偏向器の検討  

    2022年度(第75回）電気・情報関係学会九州支部連合大会  2022.9 

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    Event date： 2022.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン（大会本部：長崎大学）  

  • 樋渡裕次郎,渡邉俊夫,永山務,福島誠治   スラブ導波路を交差させたアレイ導波路回折格子の回路構成  

    2022年度(第75回） 電気・情報関係学会九州支部連合大会  2022.9 

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    Event date： 2022.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン（大会本部：長崎大学）  

  • 郡山 博樹, 渡邉 俊夫, 永山 務, 福島 誠治   光回路を用いたベクトル-行列演算器におけるクロストークの影響  

    令和3年度電気学会九州支部沖縄支所講演会  2021.12 

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    Event date： 2021.12

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：琉球大学(Online)  

  • 川迫 雅之, 渡邉 俊夫, 永山 務, 福島 誠治   複合干渉計型光スイッチの多ポート化の構成  

    Photonic Device Workshop 2021 (PDW 2021)  2021.11 

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    Event date： 2021.11

    Language：Japanese   Presentation type：Poster presentation  

  • 下山優人・渡邉俊夫・永山　務・福島誠治   光パワー分配比がカイザー窓関数にしたがうアレイ導波路型光スイッチの設計  

    2021年度(第74回）電気・情報関係学会九州支部連合大会  2021.9 

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    Event date： 2021.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：佐賀大学(Online)  

  • 井上海李・竹本春太・福島誠治・渡邉俊夫・永山　務   不均一な光アレイ部品で実装されたニューラルネットワークの課題  

    2021年度(第74回）電気・情報関係学会九州支部連合大会  2021.9 

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    Event date： 2021.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：佐賀大学(Online)  

  • 長友宏憲・福島誠治・渡邉俊夫・永山　務   電界吸収型光変調器を用いた光逓倍器の提案  

    2021年度(第74回）電気・情報関係学会九州支部連合大会  2021.9 

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    Event date： 2021.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：佐賀大学(Online)  

  • Akihiro Toshima, Tsutomu Nagayama, Seiji Fukushima, Toshio Watanabe   Design of an Acoustic Metamaterial for an Acoustic Illusion  

    2021.3 

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    Event date： 2021.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  • Tsutomu Nagayama   How to Realize Invisible Cloak with Metamaterial   Invited International conference

    IWAIT2021  2021.1 

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    Event date： 2021.1

    Presentation type：Oral presentation (invited, special)  

    Venue：Kagoshima University(Online)   Country：Japan  

  • 池田捷記, 渡邉俊夫, 永山務, 福島誠治   分布ラマン増幅を用いた光ファイバ伝送の雑音特性  

    令和2年度電気学会九州支部沖縄支所講演会  

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    Event date： 2020.12

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：琉球大学(Online)  

  • 新海 智士, 福島 誠治, 渡邉 俊夫, 永山 務   電界吸収型光変調器集積レーザを用いた周波数変換の提案(2)  

    2020年度電気・情報関係学会九州支部連合大会 

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    Event date： 2020.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：九州産業大学(Online)  

  • 戸高 慎吾, 福島 誠治, 邉 俊夫, 永山 務   アバランシェ・フォトダイオードを用いた周波数変換器の周波数特性  

    2020年度電気・情報関係学会九州支部連合大会 

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    Event date： 2020.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：九州産業大学(Online)  

  • 切通 大智, 渡邉 俊夫 ,永山 務, 福島 誠治   同一材料を用いた位相・光軸角度が波長無依存の1/4波長板  

    2020年度電気・情報関係学会九州支部連合大会 

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    Event date： 2020.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：九州産業大学(Online)  

  • 田崎公平, 渡邉俊夫, 永山務, 福島誠治   位相生成カプラを線対称に配置した複合干渉計型光スイッチ  

    第67回応用物理学会春季学術講演会 

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    Event date： 2020.3

    Language：Japanese  

  • 稲永みづほ, 福島誠治, 渡邉俊夫, 永山務   EMLを用いた光副搬送波周波数の変換  

    令和元年度電気学会九州支部沖縄支所講演会 

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    Event date： 2019.12

    Language：Japanese   Presentation type：Oral presentation (general)  

  • 齊之平晃樹,渡邉俊夫,永山務,福島誠治   テーパ型光導波路スポットサイズコンバータの光パワー伝播特性  

    電気・情報関連学会九州支部連合大会 

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    Event date： 2019.9

    Language：Japanese   Presentation type：Oral presentation (general)  

  • 斉條涼,福島誠治,渡邉俊夫,永山務,柳原聖史   アイソレータ・フリーEMLの強度雑音の評価  

    電気・情報関連学会九州支部連合大会 

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    Event date： 2019.9

    Language：Japanese   Presentation type：Oral presentation (general)  

  • 大島颯太郎,福島誠治,渡邉俊夫,永山務,柳原聖史   アバランシェフォトダイオードを用いたRF信号の周波数変換特性  

    電気・情報関連学会九州支部連合大会 

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    Event date： 2019.9

    Language：Japanese   Presentation type：Oral presentation (general)  

  • 柳原聖史,福島誠治,渡邉俊夫,永山務,大島颯太郎   光変調器内蔵レーザを用いたRF信号の周波数変換特性  

    電気・情報関連学会九州支部連合大会 

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    Event date： 2019.9

    Language：Japanese   Presentation type：Oral presentation (general)  

  • 永山務,福島誠治,渡邉俊夫   2次元異方性音響メタマテリアルのための媒質モデルについて  

    応用物理学会秋季学術講演会 

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    Event date： 2019.9

    Language：Japanese   Presentation type：Oral presentation (general)  

  • 渡邉俊夫, 嶋田周平, 永山務, 福島誠治   アレイ光導波路型光スイッチにおけるクロストークの計算方法  

    応用物理学会秋季学術講演会 

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    Event date： 2019.9

    Language：Japanese   Presentation type：Poster presentation  

  • 渡邉俊夫, 山内航, 永山務, 福島誠治   マルチコア光ファイバ対応CDC-ROADMのジョイントスイッチ構成  

    電子情報通信学会ソサイエティ大会 

    　More details

    Event date： 2019.9

    Language：Japanese  

  • 柳原聖史,福島誠治渡邉俊夫,永山務   Qマッチを用いた光変調器内蔵レーザを用いたRoF伝送特性  

    電子情報通信学会 光エレクトロニクス研究会(OPE) 

    　More details

    Event date： 2019.4

    Language：Japanese   Presentation type：Poster presentation  

  • Tsutomu Nagayama,Shuntaro Uchida,Seiji Fukushima,Toshio Watanabe   Equivalent circuit models for acoustic metamaterials based on transformation acoustics   Invited

    第9回メタマテリアル講演会 

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    Event date： 2019.3

    Language：English   Presentation type：Oral presentation (invited, special)  

  • 嶋田周平,渡邉俊夫,永山務,福島誠治   窓関数を用いたアレイ光導波路型光スイッチのクロストーク低減  

    応用物理学会春季学術講演会  

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    Event date： 2019.3

    Language：Japanese  

  • 雨﨑洋樹，福島誠治，渡邉俊夫，永山務   周波数コム発生器を用いたマイクロ波ビームステアリングの提案  

    平成30年度電気学会九州支部沖縄支所講演会 

    　More details

    Event date： 2018.12

    Language：Japanese   Presentation type：Oral presentation (general)  

  • 今岡航，福島誠治，渡邉俊夫，永山務   電界吸収型光変調器集積レーザを用いた周波数変換の提案  

    平成30年度電気学会九州支部沖縄支所講演会 

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    Event date： 2018.12

    Language：English   Presentation type：Oral presentation (general)  

  • 永山務, 内田俊太郎, 福島誠治, 渡邉俊夫   2次元異方性媒質等価回路モデルの変換音響学への適用  

    応用物理学会秋季学術講演会 

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    Event date： 2018.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：名古屋国際会議場  

  • 田崎公平, 渡邉俊夫, 永山務, 福島誠治   複合マッハ-ツェンダ干渉計型1×N光スイッチのクロストーク特性  

    電気・情報関連学会九州支部連合大会 

    　More details

    Event date： 2018.9

    Language：English   Presentation type：Oral presentation (general)  

  • 大島颯太郎，福島誠治，渡邉俊夫，永山務   半導体光デバイスを用いた高周波信号の周波数変換  

    電子情報通信学会光エレクトロニクス研究会(OPE) 

    　More details

    Event date： 2018.4

    Language：Japanese   Presentation type：Poster presentation  

  • T. Nagayama   Transmission-line metamaterials based on transformation electromagnetics   Invited

    第8回メタマテリアル講演会 

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    Event date： 2018.3

    Language：English   Presentation type：Oral presentation (invited, special)  

  • S. Shimada, T. Watanabe, T. Nagayama, S. Fukushima   Arrayed-waveguide optical switch with low crosstalk  

    電子情報通信学会研究会 信学技報 

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    Event date： 2017.12

    Language：English   Presentation type：Oral presentation (general)  

  • W. Yamauchi, T. Watanabe, T. Nagayama, S. Fukushima   Temporal response difference between thermo-optic switch and variable optical attenuator  

    電子情報通信学会研究会 

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    Event date： 2017.12

    Language：English   Presentation type：Oral presentation (general)  

  • 益留優太, 福島誠治, 古賀禎, 渡邉俊夫, 永山務   南九州における放送型自動従属監視システムの運用  

    電気・情報関係学会九州支部連合大会 

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    Event date： 2017.9

    Language：Japanese  

  • 寺野下誉人, 永山務, 福島誠治, 渡邉俊夫   変換電磁気学に基づく座標変換凸レンズについて  

    電気・情報関連学会九州支部連合大会 

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    Event date： 2017.9

    Language：Japanese   Presentation type：Oral presentation (general)  

  • 長濱早, 永山務, 福島誠治, 渡邉俊夫   等価回路モデルによるイリュージョンマントの設計について  

    電気・情報関係学会九州支部連合大会 

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    Event date： 2017.9

    Language：Japanese   Presentation type：Oral presentation (general)  

  • 宇都彪馬, 永山務, 福島誠治, 渡邉俊夫   変換電磁気学に基づくビームシフタの設計について  

    電気・情報関係学会九州支部連合大会 

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    Event date： 2017.9

    Language：Japanese   Presentation type：Oral presentation (general)  

  • 嶋田 周平, 渡邉 俊夫, 永山 務, 福島 誠治   アレイ光導波路を用いた光スイッチのクロストーク低減  

    電気・情報関係学会九州支部連合大会 

    　More details

    Event date： 2017.9

    Language：Japanese  

  • 山内 航, 渡邉 俊夫, 永山 務, 福島 誠治   熱光学効果を用いた可変光減衰器の時間応答  

    電気・情報関係学会九州支部連合大会 

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    Event date： 2017.9

    Language：Japanese  

  • 永山務   [依頼講演]変換電磁気学のための分布定数異方性メタマテリアルについて   Invited

    マイクロ波研究会/電子情報通信学会技術研究報告 

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    Event date： 2017.3

    Language：Japanese   Presentation type：Oral presentation (invited, special)  

  • 上薗 知宜, 福島 誠治, 渡邉 俊夫, 永山 務   小型人工衛星地球局用RoF システムにおける波長分散低減  

    電気・情報関係学会九州支部連合大会 

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    Event date： 2016.9

    Language：Japanese  

  • Zhengyi Gou, Seiji Fukushima, Hirotsugu Kikuchi, Toshio Watanabe, Tsutomu Nagayama   Evaluation of Light Scattering in Dye-doped Polymer/Liquid-Crystal Composite Film (PLCF)  

    電気・情報関係学会九州支部連合大会 

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    Event date： 2016.9

    Language：English  

  • 永山務, 真田篤志   変換電磁気学に基づく 2 次元分布定数異方性媒質の波長依存性について  

    電気・情報関連学会中国支部連合大会 

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    Event date： 2015.10

    Language：Japanese   Presentation type：Oral presentation (general)  

  • 永山務, 信末慶太, 真田篤志   2次元座標変換共振器の共振モードと境界条件との関係について  

    電気・情報関連学会中国支部連合大会 

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    Event date： 2014.10

    Language：Japanese   Presentation type：Oral presentation (general)  

  • 永山務, 信末慶太, 真田篤志   変換電磁気学に基づく2次元座標変換共振器について  

    電子情報通信学会ソサイエティ大会 

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    Event date： 2014.9

    Language：Japanese   Presentation type：Oral presentation (general)  

  • 永山務, 真田篤志   変換電磁気学のための2次元分布定数異方性媒質について  

    マイクロ波研究会/電子情報通信学会技術研究報告 

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    Event date： 2013.11

    Language：Japanese   Presentation type：Oral presentation (general)  

  • 永山務, 真田篤志   変換電磁気学に基づく2次元共振器の共振モード制御について  

    電気・情報関連学会中国支部連合大会 

    　More details

    Event date： 2013.10

    Language：Japanese   Presentation type：Oral presentation (general)  

  • 永山務, 真田篤志   変換電磁気学のための2次元分布定数異方性媒質  

    電子情報通信学会ソサイエティ大会 

    　More details

    Event date： 2013.9

    Language：Japanese   Presentation type：Oral presentation (general)  

  • 真田篤志, 永山務   [チュートリアル講演]変換電磁気学の基礎   Invited

    アンテナ・伝播研究専門委員会/電子情報通信学会技術研究報告 

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    Event date： 2013.8

    Language：Japanese   Presentation type：Oral presentation (invited, special)  

  • 真田 篤志, 永山 務   [特別講演]変換電磁気学とその応用～透明マントの設計法～   Invited

    マイクロ波研究会/電子情報通信学会技術研究報告 

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    Event date： 2012.10

    Language：Japanese   Presentation type：Oral presentation (invited, special)  

  • 永山 務, 真田 篤志, 久保 洋   2次元異方性媒質等価回路モデルによるカーペットクロークの設計について  

    電気・情報関連学会中国支部連合大会 

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    Event date： 2012.10

    Language：Japanese   Presentation type：Oral presentation (general)  

  • 永山 務, 真田 篤志, 山本 綱之, 久保 洋   透明マント媒質設計のための座標変換について  

    電子情報通信学会総合大会 

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    Event date： 2012.3

    Language：Japanese   Presentation type：Oral presentation (general)  

  • 山崎 佑一郎, 真田 篤志, 山本 綱之, 久保 洋, 永山 務   ミリ波帯マッシュルーム型CRLHメタマテリアルの試作とその磁気壁動作測定  

    電気・情報関連学会中国支部連合大会 

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    Event date： 2011.10

    Language：Japanese   Presentation type：Oral presentation (general)  

  • 永山 務, 真田 篤志, 久保 洋, 山本 綱之   2次元異方性媒質の等価回路パラメータ抽出について  

    電気・情報関連学会中国支部連合大会 

    　More details

    Event date： 2011.10

    Language：Japanese   Presentation type：Oral presentation (general)  

  • 永山 務, 真田 篤志, 山本 綱之, 久保 洋   Smithの透明マント媒質の動作について  

    電子情報通信学会総合大会 

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    Event date： 2011.3

    Language：Japanese   Presentation type：Oral presentation (general)  

  • 永山 務, 真田 篤志, 山本 綱之, 久保 洋, 小寺 敏郎   2次元異方性媒質に対する等価回路について  

    電気・情報関連学会中国支部連合大会 

    　More details

    Event date： 2010.10

    Language：Japanese   Presentation type：Oral presentation (general)  

  • 山崎 佑一郎, 永山 務, 真田 篤志, 山本 綱之, 久保 洋, 小寺 敏郎   異方性媒質の等価回路  

    電子情報通信学会ソサイエティ大会 

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    Event date： 2010.9

    Language：Japanese   Presentation type：Oral presentation (general)  

  • 稲永みづほ, 福島誠治, 渡邉俊夫, 永山務   EMLを用いた光副搬送波周波数の変換  

    令和元年度電気学会九州支部沖縄支所講演会  2019.12 

  • 手嶋崇人, 福島誠治, 永山務, 渡邉俊夫   液晶メタサーフェスを用いた可変偏向器の検討  

    2022年度(第75回） 電気・情報関係学会九州支部連合大会  2022.9 

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    Language：Japanese   Presentation type：Oral presentation (general)  

  • 樋渡裕次郎, 渡邉俊夫, 永山務, 福島誠治   スラブ導波路を交差させたアレイ導波路回折格子の回路構成  

    2022年度(第75回）電気・情報関係学会九州支部連合大会  2022.9 

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    Language：Japanese   Presentation type：Oral presentation (general)  

  • 平川 大凱, 福島 誠治, 渡邉 俊夫, 永山 務   アバランシェ・フォトダイオードを用いた周波数逓倍  

    令和4年度電気学会九州支部沖縄支所講演論会  2022.12 

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    Language：Japanese   Presentation type：Oral presentation (general)  

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Awards

  • 2016 Michiyuki Uenohara Memorial Award

    2016.12   IEEE MTT-S Japan, Kansai, and Nagoya Chapters   Planar Distributed Full-Tensor Anisotropic Metamaterials for Transformation Electromagnetics

    Tsutomu Nagayama

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    Award type：International academic award (Japan or overseas)  Country：Japan

    Planar distributed full-tensor anisotropic metamaterials for cloaks of invisibility based on transformation electromagnetics are proposed. The proposed metamaterials are composed of nonresonant transmission lines and are advantageous in full control of the off-diagonal components of the permeability tensor as well as broadband and low-loss characteristics. The explicit design formulas for the metamaterials are given based on the equivalent circuit derived directly from Maxwell's equations. A carpet cloak of invisibility is designed and the validity of the design theory is confirmed by circuit simulations. In addition, the carpet cloak is implemented in microstrip line technology and its performance is demonstrated experimentally at microwave frequencies.

  • 2016 IEEE MTT-S Japan Young Engineer Award

    2016.12   IEEE MTT-S Japan, Kansai and Nagoya Chapters   Planar Distributed Anisotropic Metamaterials for Transformation Electromagnetics

    Tsutomu Nagayama

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    Award type：International academic award (Japan or overseas)  Country：Japan

    Planar distributed full-tensor anisotropic metamaterials for cloaks of invisibility based on transformation electromagnetics are proposed. The proposed metamaterials are composed of nonresonant transmission lines and are advantageous in full control of the off-diagonal components of the permeability tensor as well as broadband and low-loss characteristics. The explicit design formulas for the metamaterials are given based on the equivalent circuit derived directly from Maxwell's equations. A carpet cloak of invisibility is designed and the validity of the design theory is confirmed by circuit simulations. In addition, the carpet cloak is implemented in microstrip line technology and its performance is demonstrated experimentally at microwave frequencies.

  • 電子情報通信学会九州支部「学術奨励賞」（M2）

    2023.3   電子情報通信学会九州支部  

    囿田悠希

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    Award type：Award from Japanese society, conference, symposium, etc. 

  • APMC 2018 Student Prize

    2018.11   APMC 2018 Prize Award Committee   Constant Permeability Design of Cylindrical Invisibility Cloaks with Hyperbolic Coordinate Transformation Based on Transformation Electromagnetics

    Yuma Takano

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    Award type：Award from international society, conference, symposium, etc.  Country：Japan

  • Best Paper Award

    2016.10   Radio & Electronics Association of Vietnam (REV), IEEE Communications Society (IEEE ComSoc)   Flat Retroreflector Based on Transformation Electromagnetics

    Tsutomu Nagayama

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    Award type：Award from international society, conference, symposium, etc.  Country：Viet Nam

    A flat reflector having retroreflection characteristics is presented based on transformation electromagnetics. The retroreflector is designed with a distributed full-tensor anisotropic metamaterial. Its retroreflection operations are confirmed by circuit simulations based on the equivalent circuit model of the distributed anisotropic metamaterial.

  • 平成26年度電子情報通信学会中国支部奨励賞

    2015.2   電子情報通信学会   2次元座標変換共振器の共振モードと境界条件との関係について

    永山務

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    Award type：Award from Japanese society, conference, symposium, etc.  Country：Japan

  • 平成25年度電子情報通信学会中国支部奨励賞

    2014.3   電子情報通信学会   変換電磁気学に基づく2次元共振器の共振モード制御について

    永山務

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    Award type：Award from Japanese society, conference, symposium, etc.  Country：Japan

  • 平成25年度電子情報通信学会学術奨励賞

    2014.3   電子情報通信学会   変換電磁気学のための2次元分布定数異方性媒質

    永山務

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    Award type：Award from Japanese society, conference, symposium, etc.  Country：Japan

  • 平成25年度電気学会論文発表賞B

    2013.12   電気学会   変換電磁気学に基づく2次元共振器の共振モード制御について

    永山務

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    Award type：Award from Japanese society, conference, symposium, etc.  Country：Japan

  • 平成22年度電子情報通信学会中国支部奨励賞

    2011.5   電子情報通信学会   2次元異方性媒質に対する等価回路について

    永山務

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    Award type：Award from Japanese society, conference, symposium, etc.  Country：Japan

  • 平成22年度電気学会中国支部奨励賞

    2011.3   電気学会   2次元異方性媒質に対する等価回路について

    永山務

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    Award type：Award from Japanese society, conference, symposium, etc.  Country：Japan

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Research Projects

  • 空気中を伝わる電磁波に対して動作し大きな物体も隠せる透明マントの設計法の確立

    2024.7 - 2025.3

    鹿児島大学  令和６年度鹿児島大学若手研究者研究支援事業 

    永山務

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    Authorship：Principal investigator  Grant type：Competitive

  • メタマテリアル回路理論に基づく音響トポロジカル導波路構成法の確立および実現

    2024.4 - 2025.3

    公益信託小野音響学研究助成基金 

    永山務

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    Authorship：Principal investigator  Grant type：Competitive

    Grant amount：\1000000

  • Design of a Broadband Flat Metasurface Lens by Using One-Dimensional Meander Microstrip-Line Structures

    2023.7

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    Authorship：Principal investigator  Grant type：Competitive

    Grant amount：\300000

  • 波長よりも大きな物体を隠せる透明マントの設計理論の確立および実現

    Grant number：22K14608  2022.4 - 2024.3

    日本学術振興会(JSPS)  科学研究費助成事業  若手研究

    永山務

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    Authorship：Principal investigator  Grant type：Competitive

  • 音波に対して無いものを有るかのように見せかける音響イリュージョンの実現

    2020.10 - 2021.3

    鹿児島大学  令和２年度鹿児島大学若手研究者研究支援事業 

    永山務

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    Authorship：Principal investigator  Grant type：Competitive

  • 座標変換を模擬したメタマテリアルの設計とイリュージョン媒質への応用

    2019.9 - 2020.8

    公益財団法人 日揮・実吉奨学会(民間財団等)  日揮・実吉奨学会研究助成金  日揮・実吉奨学会研究助成金

    永山務

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    Authorship：Principal investigator  Grant type：Competitive

  • 回路論に基づく音響メタマテリアル設計理論と音響透明マントへの応用

    Grant number：18K14132  2018.4 - 2020.3

    日本学術振興会(JSPS)  科学研究費助成事業  若手研究

    永山務

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    Authorship：Principal investigator  Grant type：Competitive

  • 半導体光デバイスを用いた周波数変換の研究

    Grant number：17K06432  2017.4 - 2022.3

    日本学術振興会(JSPS)  科学研究費助成事業  基盤研究(C)

    福島 誠治(研究代表者), 永山 務, 渡邉 俊夫

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    Authorship：Coinvestigator(s)  Grant type：Competitive

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Teaching Experience

  • エンジニアリング・デザイン実習

    Institution：鹿児島大学

  • 電気電子工学実験III

    Institution：鹿児島大学

  • 微分積分学II

    Institution：鹿児島大学

  • 工学分野実験・演習

    Institution：鹿児島大学

  • 応用数学II及び演習 (演習担当)

    Institution：鹿児島大学

  • 電気電子工学実験IA

    Institution：鹿児島大学

  • 電気電子工学実験IB

    Institution：鹿児島大学

  • 電気電子工学実験II

    Institution：鹿児島大学

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Social Activities

  • リフレッシュ理科教室

    Role(s)： Advisor,　Organizing member,　Demonstrator

    公益社団法人 応用物理学会  2023.8

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    Audience： Schoolchildren

    Type：Other

  • リフレッシュ理科教室

    Role(s)： Advisor,　Organizing member,　Demonstrator

    公益社団法人 応用物理学会  2021.8

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    Audience： Schoolchildren,　Junior students,　Teachers,　Guardians

    Type：Other

  • リフレッシュ理科教室

    Role(s)： Advisor,　Organizing member,　Demonstrator

    公益社団法人 応用物理学会  2019.8

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    Audience： Schoolchildren,　Junior students,　Teachers,　Guardians

    Type：Other

  • サイエンスカフェかごしま 不思議な性質を示す人工材料メタマテリアル

    Role(s)： Lecturer

    鹿児島大学サイエンスカフェ有志の会  2019.7

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    Audience： Schoolchildren,　Junior students,　High school students,　College students,　Graduate students,　Guardians,　General

    Type：Science cafe

  • リフレッシュ理科教室

    Role(s)： Advisor,　Organizing member

    公益社団法人 応用物理学会  2018.8

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    Audience： Schoolchildren,　Junior students,　Teachers,　Guardians

    Type：Other

Media Coverage

  • メタマテリアル Newspaper, magazine

    株式会社南日本新聞社  南日本新聞(2022年2月18日)  オセモコ面「サイエンスカフェ」  2022.2

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    Author：Myself