鹿児島大学工学部先進工学科 電気電子工学プログラム
通信システム工学分野 永山研究室
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査読付き論文
▶︎2024年
S. Toyomitsu, T. Nagayama, S. Fukushima, and T. Watanabe, “Design of Topological Waveguide Using Two Types of Rhombic Unit Cell Structures Mutually Shifted by Half-period,” in 2024 Asia-Pacific Microwave Conference (APMC), Nov. 2024, pp. 1-3.
T. Watanabe, S. Taguchi, T. Nagayama, and S. Fukushima, “Rising Time Reduction by Cascading Mach-Zehnder Interferometer Optical Switches,” in 29th Microoptics Conference (MOC2024), Oct. 2024, pp. 1–2.
T. Nagayama, “Two Types of Rhombic Distributed Transmission-Line Models for Designing Topological Waveguides,” in 2024 54th European Microwave Conference (EuMC), Sep. 2024, pp. 397-400.
S. Fukushima, K. Nakamura, T. Nagayama, T. Watanabe, and H. Kikuchi, “Demonstration of variable focus lens using liquid crystal metasurface,” in The 4th International Online Conference on Crystals, Sep. 2024, p. 1.
K. Nakamura, T. Nagayama,S. Fukushima, T. Watanabe, and H. Kikuchi, “Demonstration of variable focus lens using liquid crystal metasurface,” in 10th Japanese-Italian Workshop on Liquid Crystals (JILCW2024), Sep. 2024, p. 1.
T. Nagayama, “Design Method for Broadband Metasurfaces with a Function of a Two-dimensional Axicon Lens,” in 2024 Photonics & Electromagnetics Research Symposium (PIERS), Apr. 2024, pp. 1-6.
▶︎2023年
T. Nagayama, “Design Method for Topological Waveguides by Using Two Types of Rhombic Composite Right/Left-Handed Transmission-Lines,” in 2023 IEEE Asia-Pacific Microwave Conference (APMC), Dec. 2023, pp. 98-100.
(DOI:10.1109/apmc57107.2023.10439689)
T. Kashiwaki, S. Fukushima, T. Watanabe, and T. Nagayama, “Spatial Distribution Observation of Sonoluminescence from Acoustic Cavitation Bubbles in Electric-Field-Applied Water,” in 28th Microoptics Conference (MOC2023), Sep. 2023, pp. 1-2.
(DOI:10.23919/MOC58607.2023.10302916)
T. Nagayama, “Design Method for Negative Refractive Index Metasurface Lenses by Using a One-Dimensional Distributed Transmission-Line Model,” in 2023 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT), Aug. 2023, pp. 76-78.
(DOI:10.1109/RFIT58767.2023.10243384)
T. Nagayama, “Design Method of Broadband Metasurfaces for Generating a Two-dimensional Gaussian Beam from a Normal Incident Plane Wave with the Same Amplitude Distibution,” in 2023 Photonics & Electromagnetics Research Symposium(PIERS), July 2023, pp. 1173-1179.
(DOI:10.1109/PIERS59004.2023.10221277)
I. Suhara, T. Nagayama, S. Fukushima, and T. Watanabe, “Implementation Method for Broadband Metasurfaces Based on a Distributed Transmission-Line Model,” in 2023 Photonics & Electromagnetics Research Symposium(PIERS), July 2023, pp. 1899-1904.
(DOI:10.1109/PIERS59004.2023.10221359)
T. Teshima, S. Fukushima, T. Nagayama, and T. Watanabe, “Light beam steering demonstration by using liquid crystal loaded metasurface,” in 2023 Photonics & Electromagnetics Research Symposium (PIERS), July 2023, pp. 1895-1898.
(DOI:10.1109/PIERS59004.2023.10221529)
▶︎2022年
I. Suhara, T. Nagayama, S. Fukushima, and T. Watanabe, “Implementation Method for Broadband Metasurfaces Based on a Distributed Transmission-Line Model,” in 2022 RFM IEEE International RF & Microwave Conference, Dec. 2022, pp. 1-3.
(DOI:10.23919/RFM56185.2022.10065054)
T. Nagayama, “Design Method for Broadband Invisible Cloaks by Using Straight and Meander Transmission-Lines,” in 2022 RFM IEEE International RF & Microwave Conference, Dec. 2022, pp. 1-4.
(DOI:10.23919/RFM56185.2022.10065136)
Y. Sonoda, T. Nagayama, S. Fukushima, and T. Watanabe, “Design of a Broadband Carpet Cloak for Hiding Larger Objects than the Wavelength by Using One-Dimensional Meander Microstrip-Line Structures,” in 2022 IEEE Asia-Pacific Microwave Conference (APMC), Dec. 2022, pp. 76-78.
(DOI:10.23919/APMC55665.2022.9999886)
I. Takegami, T. Nagayama, S. Fukushima, and T. Watanabe, “Design Method of Acoustic Metamaterials for Negative Refractive Index Acoustic Lenses Based on the Transmission-Line Theory,” Crystals, vol. 12, no. 11, pp. 1–11 (Art. ID:1655), Nov. 2022.
(DOI:10.3390/cryst12111655)
T. Nagayama, A. Toshima, S. Fukushima, and T. Watanabe, “Two-Dimensional Distributed Transmission-Line Models for Broadband Full-Tensor Anisotropic Acoustic Metamaterials Based on Transformation Acoustics,” Crystals, vol. 12, no. 11, pp. 1–17 (Art. ID:1557), Oct. 2022.
(DOI:10.3390/cryst12111557)
T. Nakagawa, T. Nagayama, S. Fukushima, and T. Watanabe, “Constitution Method for Broadband Acoustic Metamaterials Based on the Design Theory of a One-Dimensional Distributed Transmission-Line Model,” Crystals, vol. 12, no. 11, pp. 1–11 (Art. ID:1528), Oct. 2022.
(DOI:10.3390/cryst12111528)
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, pp. 1-3.
(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. Toshima, Y. Sonoda, S. Fukushima, and T. Watanabe, “Design of a Carpet Cloak by Using an One-Dimensional Distributed Transmission-Line Model,” in 2021 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-Dimensional 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)
▶︎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.