永山研究室HP

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査読付き論文


▶︎2022年

  • M. Kawasako, T. Watanabe, T. Nagayama, and S. Fukushima, “Scalability of Multi-Stage Nested Mach-Zehnder Interferomer Optical Switch with Phase Generating Couplers,” Advance in Science, Technology and Engineering Systems Journal (ASTES), vol. 7, no. 4,  pp. 140-146, Aug. 2022. (DOI:10.25046/aj070418)
  • T. Kiritoshi, T. Watanabe, T. Nagayama, and S. Fukushima, “Coupling characteristics of a mode multi/demultiplexer with a vartically stacked asymmetric directional coupler,” in 27th Opto-Electronics and Communications Conference / International Conference on Photonics in Switching and Computing (OECC/PSC 2022), Jul. 2022.
    (DOI:10.23919/OECC/PSC53152.2022.9849938)
  • T. Nagayama, “Design Method of Broadband Acoustic Metasurfaces Based on the Transmission-Line Theory,” in 2022 Photonics & Electromagnetics Research Symposium(PIERS), Apr. 2022, pp. 432-438. (DOI:10.1109/PIERS55526.2022.9793268)


▶︎2021年

  • T. Nagayama, S. Fukushima, and T. Watanabe, “Design Method of Broadband Flat Metasurface Lenses by Using an One-Dimensional Distributed Transmission-Line Model,” in 2021 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting, Dec. 2021, pp. 403-404. (DOI:10.1109/aps/ursi47566.2021.9704148)
  • T. Nagayama, A. Toshoma, Y. Sonoda, S. Fukushima, and T. Watanabe, “Design of a Carpet Cloak by Using an One-Dimensional Distributed Transmission-Line Model,” in 2020 IEEE Asia-Pacific Microwave Conference (APMC), Nov. 2021, pp. 353-355. (DOI:10.1109/APMC52720.2021.9661681)
  • A. Toshima, T. Nagayama, S. Fukushima, and T. Watanabe, “Acoustic Illusion Medium Mimicking Scattered Waves of a Groove on a Flat Surface Based on Transformation Acoustics,” in 2021 Photonics & Electromagnetics Research Symposium(PIERS), Nov. 2021, pp. 2587-2592. (DOI:10.1109/PIERS53385.2021.9694828)
  • S. Fukushima, S. Yanagihara, T. Watanabe, and T. Nagayama, “Light Modulation Enhancement by using an Impedance Matching Scheme for a Subcarrier Multiplexed Light Transmitter,” Advance in Science, Technology and Engineering Systems Journal (ASTES), vol. 6, no. 6,  pp. 7-11, Nov. 2021. (DOI:10.25046/aj060602)
  • M. Kawasako, T. Watanabe, T. Nagayama, and S. Fukushima, “4-Stage Mach-Zehnder Interferometer Optical Switch with Phase Generating Coupler,” in 2021 26th Microoptics Conference (MOC), Sep. 2021, pp. 1-2. (DOI:10.23919/MOC52031.2021.9598066)
  • K. Sainohira, T. Watanabe, T. Nagayama, and S. Fukushima, “Truncated spot size converters for silicon photonic wire waveguides,” in 2021 Opto-Electronics and Communications Conference (OECC), July. 2021, pp. 1-3. (DOI:10.1364/OECC.2021.W4F.3)
  • T. Nagayama, “Design Method for Broadband Metasurfaces by Using a Simple Non-Resonant One-Dimentional Transmission-Line Model,” in 2021 2nd International Conference for Emerging Technology, May. 2021, pp. 1-4. (DOI:10.1109/INCET51464.2021.9456227)
  • 永山務, 青柳祥平, 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,” 電子情報通信学会和文誌C マイクロ波・ミリ波特集号, vol. J104-C, no. 1, pp. 33-42, 2021年1月. (Online ISSN:1881-0217, URL)


▶︎2020年

  • T. Nagayama, S. Fukushima, and T. Watanabe, “Two-Dimensional Full-Tensor Anisotropic Metamaterials with the Impedance of Free Space for Transformation Electromagnetics,” in 2020 IEEE Asia-Pacific Microwave Conference (APMC), Dec. 2020, pp. 134-136. (DOI:10.1109/APMC47863.2020.9331685)
  • S. Yanagihara, S. Fukushima, T. Watanabe, and T. Nagayama, “Impedance-matched Feedline for a Semiconductor Laser Emitting Subcarrier Multiplexed Light,” in 2020 Opto-Electronics and Communications Conference (OECC), Oct. 2020, pp. 1-3. (DOI:10.1109/OECC48412.2020.9273591)
  • T. Nagayama, S. Fukushima, and T. Watanabe, “Design Method for Negative Refractive Index Metamaterials by Using a Distributed Transmission-Line Model,” in 2020 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT), Sep. 2020, pp. 58-60. (DOI:10.1109/RFIT49453.2020.9226180)
  • T. Nagayama, “Equivalent Circuit Models for Full-Tensor Anisotropic Composite Right/Left-Handed Metamaterials,” in 2020 IEEE/MTT-S International Microwave Symposium (IMS), Aug. 2020, pp. 317-320. (DOI:10.1109/IMS30576.2020.9223938)
  • K. Tasaki, M. Tokumaru, T. Watanabe, T. Nagayama, and S. Fukushima, “Nested Mach-Zehnder Interferometer Optical Switch with Phase Generating Couplers,”  Japanese Journal of Applied Physics, vol. 59, no. SOOB04, pp. 1–4, May 2020. (DOI:10.35848/1347-4065/ab8f09)


▶︎2019年

  • T. Nagayama, S. Uchida, S. Fukushima, and T. Watanabe, “Equivalent Circuit Models for Two-Dimensional Full-Tentor Anisoropic Acoustic Metamaterials,” in 2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall), Dec. 2019, pp. 989-995.(DOI:10.1109/PIERS-Fall48861.2019.9021320)
  • T. Nagayama, S. Kakoi, S. Fukushima, and T. Watanabe, “Transmission-Line Approach to Zero-Index Material for Invisible Cloaks,” in 2019 IEEE Asia-Pacific Microwave Conference (APMC), Dec. 2019, pp. 81-83. (DOI:10.1109/APMC46564.2019.9038216)
  • (Invited)T. Nagayama and A. Sanada, “Broadband transmission-line illusions based on transformation electromagnetics,”  EPJ Applied Metamaterials, vol. 6, no. 23, pp. 1–10, November 2019.(DOI:10.1051/epjam/2019018)
  • T. Watanabe, K. Tasaki, T. Nagayama, and S. Fukushima, “Nested Mach-Zehnder Interferometer optical switch with low crosstalk,” in 2019 24th Microoptics Conference (MOC), Nov. 2019, pp. 234–235. (DOI:10.23919/MOC46630.2019.8982851)
  • S. Shimada, T. Watanabe, T. Nagayama, and S. Fukushima, “Design of arrayed-waveguide optical switch employing window function for crosstalk reduction,”  Japanese Journal of Applied Physics, vol. 58, no. SJJB03, pp. 1–4, July 2019. (DOI:10.7567/1347-4065/ab27b1)
  • W. Yamauchi, T. Watanabe, T. Nagayama, and S. Fukushima, “Joint-Switching Architecture Utilizing Waveguide-Based Multicast Switch in CDC-ROADM for Multi-Core Fiber Networks,” in 24th OptoElectronics and Communications Conference (OECC) and 2019 International Conference on Photonics in Switching and Computing (PSC), July 2019, pp. 1–3.(DOI:10.23919/PS.2019.8817853)


▶︎2018年

  • T. Nagayama, S. Fukushima, T. Watanabe, and A. Sanada, “Flat Retroreflector Mimicking a Cylindrical Retroreflector with a Function of a Luneburg Lens,” in 2018 IEEE Asia-Pacific Microwave Conference (APMC), Nov. 2018, pp. 1-4.(DOI:10.23919/APMC.2018.8617161)
  • Y. Takano, T. Nagayama, and A. Sanada, “Constant Permeability Design of Cylindrical Invisibility Cloaks with Hyperbolic Coordinate Transformation Based on Transformation Electromagnetics,” in 2018 IEEE Asia-Pacific Microwave Conference (APMC), Nov. 2018, pp. 1-4. APMC 2018 Student Prize受賞(Y. Takano, Osaka Univ.) (平成30年11月9日) (DOI:10.23919/APMC.2018.8617298)
  • S. Shimada, T. Watanabe, T. Nagayama, and S. Fukushima, “Design of arrayed-waveguide optical switch employing window function ,” in 2018 23th Microoptics Conference (MOC) 2018, pp. 1-2, Oct. 2018.
  • S. Fukushima, T. Ueozno, S. Ohshima, T. Watanabe, and T. Nagayama, “Opto-electronic frequency conversion employing an electro-absorption modulated laser for a cube satellite earth station,” in 2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama), Aug. 2018, pp. 1-5. (DOI:10.23919/PIERS.2018.8598042)
  • T. Nagayama and A. Sanada, “Coordinate transformation resonators,” Applied Physics Letters, vol. 112, no. 23, pp. 234101-1–234101-4, 2018. (DOI:10.1063/1.5027017)
  • T. Nagayama, S. Fukushima, and T. Watanabe, “2-D Flat Lenses Based on Transformation Electromagnetics,” in 2018 Thailand-Japan Microwave, June 2018, p. 1–4.

▶︎2017年

  • T. Nagayama, S. Fukushima, and T. Watanabe, “Flat Focusing Reflector Simulation Employing Circuit Models,” in 2017 IEEE Asia-Pacific Microwave Conference (APMC), Nov. 2017, pp. 1-4. (DOI:10.1109/APMC.2017.8251709)
  • Tomonori Uezono, Seiji Fukushima, Toshio Watanabe, Tsutomu Nagayama, “Link Length Analysis of a Radio-on-Fiber System for a Cube Satellite Earth Station,” in Annual Conference on Engineering and Applied Science (ACEAT), Nov. 2017. 
  • (Invited)T. Nagayama, “Distributed Full-Tensor Anisotropic Metamaterials for Implementing Coordinate Transformation Media,” in Proceedings of The 2017 Vietnam-Japan Microwave VJMW 2017, June 2017, pp. 89-92. 

▶︎2016年

  • T. Nagayama, A. Sanada, S. Fukushima, and T. Watanabe, “Flat retroreflector based on transformation electromagnetics,” in 2016 International Conference on Advanced Technologeis for Communications (ATC), pp. 13–16, Oct. 2016, Best Paper Award受賞(平成28年10月13日). (DOI:10.1109/ATC.2016.7764759)
  • T. Nagayama and A. Sanada, “Illusion medium mimicking scattered waves of a bump on a flat surface based on transformation electromagnetics,” in The 5th Advances Lasers and Photon Sources (ALPS’16), May 2016, pp. 1–2. 

▶︎2015年

  • T. Nagayama and A. Sanada, “Planar distributed full-tensor anisotropic metamaterials for transformation electromagnetics,” IEEE Transactions on Microwave Theory and Techniques, vol. MTT–63, no. 12, pp. 3851–3861, 2015, Young Engineer AwardおよびMichiyuki Uenohara Memorial Award受賞(平成28年12月1日).   (DOI:10.1109/TMTT.2015.2487275)

▶︎2014年

  • (Invited)A. Sanada and T. Nagayama, “Transmission line metamaterials for transformation electromagnetics,” in 2014 44th European Microwave Conference, Oct. 2014, pp. 965–967.(DOI:10.1109/EuMC.2014.6986597)      
  • (Invited)A. Sanada and T. Nagayama, “Transmission line approach to 2D full–tensor anisotropic metamaterials for transformation electromagnetics,” in 2014 International Conference on Electromagnetics in Advanced Applications, Aug. 2014, pp. 804–805.(DOI:10.1109/ICEAA.2014.6903967) 
     

▶︎2013年

  • T. Nagayama and A. Sanada, “Specular reflection from a sinusoidal periodic boundary by a carpet cloak of invisibility,” in 2013 Asia-Pacific Microwave Conference Proceedings (APMC), Nov. 2013, pp. 1209-1211. (DOI:10.1109/APMC.2013.6695073)          
  • T. Nagayama and A. Sanada, “Physical equivalent circuit model for 2D full-tensor anisotropic metamaterials,” 2013 IEEE MTT-S International Microwave Symposium Digest (IMS), June 2013, pp. 1-3. (DOI:10.1109/MWSYM.2013.6697788)
  • (Invited)A. Sanada and T. Nagayama, “Transmission line approach for transformation electromagnetics,” Proceedings of the 2013 International Symposium on Electromagnetic Theory, May 2013, pp. 336-337.