SUZUKI Takehito

Activity information

Name and contact details

• Name

  スズキ　タケヒト, 鈴木　健仁, SUZUKI Takehito

Affiliation / Position

• Institute of Engineering　Division of Advanced Electrical and Electronics Engineering, Associate Professor

Other affiliation

• Faculty of Engineering　Department of Electrical and Electronic Engineering
• Graduate School of Engineering　Department of Electrical and Electronic Engineering

Research History

• Japan Science and Technology Agency
  創発研究者
  From 01 Apr. 2023
• 東京農工大学 工学研究院
  准教授
  From Jun. 2022
• 国立研究開発法人 科学技術振興機構
  さきがけ研究者
  From 01 Oct. 2018, To 31 Mar. 2022
• Tokyo University of Agriculture and Technology
  准教授（テニュアトラック）
  From Jun. 2017
• 茨城大学 工学部
  講師
  From Apr. 2015, To Jun. 2017
• 茨城大学 工学部
  助教
  From Apr. 2009, To Mar. 2015
• 独立行政法人 日本学術振興会
  特別研究員
  From Apr. 2006, To Mar. 2009

Education

• Tokyo Institute of Technology
  To Mar. 2009, completed, doctor course
• Tokyo Institute of Technology
  To Mar. 2006, completed, master course
• Tokyo Institute of Technology
  To Mar. 2004, graduated

Current state of research and teaching activities

• Terahertz antennas, Extreme materials in the terahertz waveband, Terahertz metamaterials, Extreme-sensitivity terahertz polarization measurements, ultrahigh-speed wireless communication in the terahertz waveband, Terahertz application systems.

Teaching Experience

• 先進知能情報システム工学実験I
  2023, 専門科目等

Grants-in-Aid for Scientific Research

• 基盤研究(B)
  超高屈折率・無反射な積層材料によるテラヘルツ電磁波の高効率制御の学理構築
  From 2021, To 2023
• 挑戦的研究（萌芽）
  超高屈折率・無反射な積層材料によるテラヘルツ光渦の発生
  From 2021, To 2022
• 基盤研究(C)
  屈折率が10以上の超高屈折率・無反射なテラヘルツ波帯材料の研究
  From 2018, To 2020
• 若手研究(A)
  リアルタイムテラヘルツナノイメージングのためのゼロ近傍屈折率メタマテリアルの研究
  From 2014, To 2017

Papers

• Polarization-independent isotropic metasurface with high refractive index, low reflectance, and high transmittance in the 0.3-THz band
  Sato, Kento; Suzuki, Takehito
  NANOPHOTONICS
  WALTER DE GRUYTER GMBH
  Metasurfaces substituted for naturally occurring materials make it possible to develop flat optics manipulating terahertz waves. However, the control of unprecedented material properties with metasurfaces frequently produces anisotropic material properties and has yet to be commonly adopted because of the limitation of functionalities as optical components. Here, we demonstrate an isotropic metasurface with polarization-independent material properties with the extremely high refractive index of 14.0 + j0.49, low reflectance of 1.0 %, and high transmittance of 86.9 % at 0.31 THz. Measurements by terahertz time-domain spectroscopy (THz-TDS) verify that the fabricated metasurface with a high refractive index, low reflectance, and high transmittance works for terahertz waves with any polarization direction and results in the unprecedented material characteristics with polarization independence. The relative permittivity and relative permeability are 13.9 - j1.4 and 13.8 + j2.3, respectively. The sum of the dielectric and magnetic energy losses must also be considered to verify the conservation of energy for metasurfaces. The sum of the dielectric and magnetic energy losses is very close to positive values and the conservation of energy is largely satisfied. The proposed metasurface would offer optical components with attractive functionalities such as wavefront control, directivity enhancement, and optical vortices for 6G communications.
  27 Jun. 2023, Research paper (scientific journal), joint, 12, 13, 2192-8606, DOI(公開)(r-map), 2537, 2544
• Resonant tunneling diode integrated with metalens for high-directivity terahertz waves
  Endo, Kota; Sekiya, Masashi; Kim, Jaeyoung; Sato, Kento; Suzuki, Takehito
  APPLIED PHYSICS EXPRESS
  IOP PUBLISHING LTD
  Terahertz flat optics based on our originally developed low-reflection metasurface with a high refractive index can offer attractive two-dimensional optical components for the manipulation of terahertz waves. However, it remains to be shown whether a planar collimating metalens made with our original metasurface could be mounted on a resonant tunneling diode with a short distance. Here, we demonstrate that a collimating metalens with a distance of 1.0 mm from the RTD enhances the directivity to 3.0 times at 0.312 THz. The proposed metalens would be integrated with various terahertz continuous-wave sources for emerging industry such as 6 G (beyond 5 G) communications.
  01 Aug. 2021, Research paper (scientific journal), joint, 14, 8, 1882-0778, DOI(公開)(r-map)
• Metalens mounted on a resonant tunneling diode for collimated and directed terahertz waves
  Suzuki, Takehito; Endo, Kota; Kim, Jaeyoung; Tsuruda, Kazuisao; Sekiya, Masashi
  OPTICS EXPRESS
  OPTICAL SOC AMER
  Refraction in materials is a fundamental phenomenon in optics and is a factor in the manipulation of light, such as wavefront shaping and beam control. However, conventional optical lenses incorporated in numerous optical sources are made of naturally occurring materials, and material properties predetermine the lens performance. For the development of terahertz flat optics, we experimentally demonstrate a gradient-refractive-index (GRIN) collimating metalens made of our original reflectionless metasurface with an extremely high refractive index, above 10 at 0.312 THz. The planar collimating metalens converts wide-angle radiation from a resonant tunneling diode (RTD) to a collimated plane wave and enhances the directivity of a single RTD 4.2 times. We also demonstrate directional angle control of terahertz waves by moving the metalens in parallel with the incoming wave. The metalens can be simply integrated with a variety of terahertz continuous-wave (CW) sources for 6G (beyond 5G) wireless communications and imaging in future advanced applications. Flat optics based on high refractive index metasurfaces rather than naturally occurring materials can offer an accessible platform for optical devices with unprecedented functionalities. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
  07 Jun. 2021, Research paper (scientific journal), joint, 29, 12, 1094-4087, DOI(公開)(r-map), 18988, 19000
• Reflectionless metasurface with high refractive index in the terahertz waveband
  Harumi, Asada; Endo, Kota; Suzuki, Takehito
  OPTICS EXPRESS
  OPTICAL SOC AMER
  Terahertz flat optics is a design concept for replacing conventional three-dimensional bulky optical components with two-dimensional ultra-thin optical components. However, high refractive index materials suitable for flat optics are frequently subject to high Fresnel reflections due to the cumbersome control of the relative permeability it requires. Here we experimentally demonstrate a reflectionless metasurface with a high refractive index of 5.88 + j1.57, extremely low reflectance of 1.3%, high relative permittivity of 6.73 + j0.85, and the high relative permeability of 5.03 + j2.11 at 2.97 THz. The super-fine ink-jet printer using silver paste ink fabricates the metasurface consisting of 80,036 pairs of cut metal wires on both the front and back of a 5 mu m-thick polyimide film. The findings also demonstrate that weak conductors as well as good conductors can be used in the design of reflectionless metasurfaces with a high refractive index in the terahertz waveband. The presented metasurface can offer an accessible platform for terahertz flat optics in 6G (beyond 5G) wireless communications and imaging. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
  10 May 2021, Research paper (scientific journal), joint, 29, 10, 1094-4087, DOI(公開)(r-map), 14513, 14524
• Terahertz focusing metalens of reflectionless meta-atoms with negative refractive indices
  Nakao, Haruaki; Kondoh, Satoshi; Suzuki, Takehito
  APPLIED OPTICS
  OPTICAL SOC AMER
  Terahertz continuous-wave (CW) sources oscillating around the 1.0 THz band at room temperature have rapidly been developed to bridge the terahertz gap. However, reflectionless metasurfaces suitable for integration with terahertz CW sources as optical components have yet to be developed in the terahertz gap. Here, we propose a terahertzfocusing metalens consisting of reflectionless meta-atoms with a discrete distribution of negative refractive indices from -1.1 to -2.8. The proposed 2D gradient-refractive-index metalens converts an incident terahertz Gaussian beam to a line focus. We also experimentally demonstrate a metasurface of reflectionless meta-atoms with a negative refractive index of -2.8 adopted in the periphery of the metalens. The reflectionless metasurface in the terahertz gap would be a welcome contribution to the rapid growth of terahertz industrial applications with terahertz CW sources. Further, the design approach based on reflectionless meta-atoms with negative refractive indices could be applied to various 2D planar optical components with attractive functionalities such as collimating, arbitrary wave-front shaping, and light vortices. (C) 2021 Optical Society of America
  01 May 2021, Research paper (scientific journal), joint, 60, 13, 1559-128X, DOI(公開)(r-map), 3989, 3996
• Reflectionless zero refractive index metasurface in the terahertz waveband
  Suzuki, Takehito; Asada, Harumi
  OPTICS EXPRESS
  OPTICAL SOC AMER
  Zero refractive index materials behave electromagnetically as single points despite the finite dimensions because a propagating electromagnetic wave passes with an infinite phase velocity. However, the composition of naturally occurring materials cannot produce a zero refractive index material because any effect of both of the dielectric and magnetic properties would have to vanish (be near zero). In this report, we demonstrate a zero refractive index metasurface with a refractive index of 0.16 + j0.09, the reflectance of 0.7%, and transmittance of 97.3% at 0.505 THz. The measured relative permittivity and relative permeability are 0.18 - j0.10 and 0.004 + j0.16 at 0.505 THz, respectively. Both the relative permittivity and relative permeability simultaneously approach zero at the same frequency, and the dielectric and magnetic properties appear to be absent (vanish) in the artificial material. The zero refractive index metasurface can offer a material platform for terahertz applications with unprecedented functionalities for 6G (beyond 5G) wireless communications, imaging, and security. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
  20 Jul. 2020, Research paper (scientific journal), joint, 28, 15, 1094-4087, DOI(公開)(r-map), 21509, 21521
• Terahertz metasurface ultra-thin collimator for power enhancement
  Suzuki, Takehito; Endo, Kota; Kondoh, Satoshi
  OPTICS EXPRESS
  OPTICAL SOC AMER
  Manipulation of electromagnetic waves from radio to visible wavelengths could lead to technology to investigate unexplored wavebands. However, flexible control of terahertz waves is difficult, because few naturally occurring, appropriate materials and sophisticated optical components exist. We propose a 2.28-mu m (0.02X) ultra-thin terahertz metasurface collimator with a high directivity of 4.6 times (6.6 dB) consisting of 339 pairs of meta-atoms compared with a single terahertz continuous-wave source. The metasurface exhibits an extremely high refractive index of 15.0 and a low reflectance of 15.5% at 3.0 THz, and with Fresnel reflections for naturally occurring dielectric materials with high refractive indices avoided. This metasurface collimator should facilitate ground-breaking applications such as arbitrary phase converters, solid immersion lenses, and cloaking. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
  20 Jul. 2020, Research paper (scientific journal), joint, 28, 15, 1094-4087, DOI(公開)(r-map), 22165, 22178
• Terahertz beam focusing through designed oblique metal-slit array
  Suzuki, Takehito; Sekiya, Masashi; Kitahara, Hideaki
  APPLIED OPTICS
  OPTICAL SOC AMER
  Manipulation of propagating beams is essential in applications, and the potentially arising phenomena offer attractive optical components. However, the design of optical components using only naturally occurring materials has approached physical limits, and artificial materials such as metamaterials and metasurfaces are a way forward to open the door to sophisticated optical components. This paper shows manipulation of terahertz beams through designed oblique metal-slit arrays where a common metal-slit array does not perform as a lens. The oblique metal-slit array has a refractive index determined as a function of a steep angle. The lens consists of multiple metal plates with a designed oblique angle, and a convex output structure produces a focusing effect. We also suggest that the Brewster phenomenon in the lens can simply enhance the electric field intensity at the focal point. The Brewster condition of the lens is correlated with a jagged edged face on the input side with an appropriate metal-slit spacing and thickness. The phenomenon would be applicable to numerous promising components and applications such as gain-enhancement optical components and perfect impedance-matching polarizers. (C) 2019 Optical Society of America
  20 May 2019, Research paper (scientific journal), joint, 58, 15, 1559-128X, DOI(公開)(r-map), 4007, 4013
• Epsilon-near-zero three-dimensional metamaterial for manipulation of terahertz beams
  Suzuki, Takehito; Sato, Tatsuya; Sekiya, Masashi; Young, John C.
  APPLIED OPTICS
  OPTICAL SOC AMER
  Metamaterials offer the potential of unprecedented refractive indices and evolution into metadevices for the manipulation of electromagnetic waves. However, the potential of the epsilon-near-zero (ENZ) concept has not been fully demonstrated in the terahertz waveband. Most conventional ENZ lenses have a uniform distribution of refractive indices in spite of their three-dimensional structure. Here, inspired by the ENZ concept, we demonstrate the two-dimensional distribution of a three-dimensional ENZ lens realized by circular openings of varying diameters on metal plates and apply it to a metal-slit array lens with gradient indices of 0 < n(eff) < 1. The measurements of a fabricated metal-slit array lens with circular openings observe the focusing effect of a terahertz wave. We also apply the ENZ concept to the design of microlens arrays. The control of the gradient of the ENZ potentially offers a wide range of applications. (C) 2019 Optical Society of America
  10 Apr. 2019, Research paper (scientific journal), joint, 58, 11, 1559-128X, DOI(公開)(r-map), 3029, 3035
• Negative refractive index metasurface in the 2.0-THz band
  Suzuki, Takehito; Kondoh, Satoshi
  OPTICAL MATERIALS EXPRESS
  OPTICAL SOC AMER
  Development of continuous wave (CW) sources has recently advanced in various frequencies of the terahertz waveband. However, there are few materials suitable for the terahertz waveband, and attractive materials are eagerly awaited. Metamaterials with artificial sub-wavelength structures would enable designs with an arbitrary refractive index including negative values providing simultaneous control of dielectric and magnetic properties. Here, measurements demonstrate that a simple metasurface, a two-dimensional metamaterial, consisting of asymmetrical metal patches on the front and back of a dielectric substrate has a negative refractive index of -3.03 + j0.29, transmission of 56.4%, and a reflection of 3.51% at 1.96 THz. The metasurface would offer attractive optical components such as super lenses, ultrathin collimators, and cloaking. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
  01 Jul. 2018, Research paper (scientific journal), joint, 8, 7, 2159-3930, DOI(公開)(r-map), 1916, 1925
• Negative refractive index metamaterial with high transmission, low reflection, and low loss in the terahertz waveband
  Suzuki, Takehito; Sekiya, Masashi; Sato, Tatsuya; Takebayashi, Yuki
  OPTICS EXPRESS
  OPTICAL SOC AMER
  The refractive index is a basic parameter of materials which it is essential to know for the manipulation of electromagnetic waves. However, there are no naturally occurring materials with negative refractive indices, and high-performance materials with negative refractive indices and low losses are demanded in the terahertz waveband. In this paper, measurements by terahertz time-domain spectroscopy (THz-TDS) demonstrate a metamaterial with a negative refractive index n of -4.2 + j0.17, high transmitted power of 81.5%, low reflected power of 4.3%, and a high figure of merit (FOM = vertical bar Re(n)/Im(n)vertical bar) of 24.2 at 0.42 THz. The terahertz metamaterial with these unprecedented properties can provide various attractive terahertz applications such as superlenses with resolutions beyond the diffraction limit in terahertz continuous wave imaging. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.
  02 Apr. 2018, Research paper (scientific journal), joint, 26, 7, 1094-4087, DOI(公開)(r-map), 8314, 8324
• 極限屈折率材料の探索とテラヘルツ波帯への応用
  鈴木 健仁
  応用物理
  Oct. 2017, only, 86, 10, 897, 902
• Metamaterial Demonstrates Both a High Refractive Index and Extremely Low Reflection in the 0.3-THz Band
  Ishihara Koki and Suzuki, Takehito
  Journal of Infrared, Millimeter, and Terahertz Waves(招待論文)
  Communication and imaging in the terahertz waveband have advanced rapidly in offering industrial applications. However, optical elements such as collimated lenses in the terahertz waveband are bulky compared with the wavelength due to the lack of naturally occurring substances with a high refractive index and low loss. It is essential to miniaturize optical elements in the terahertz waveband for industrial application. Metamaterials consisting of subwavelength structures can arbitrarily control permittivity and permeability and provide a range of refractive indices. Here, we demonstrate a metamaterial with both a high refractive index and extremely low reflection consisting of symmetrically aligned paired cut metal wires with 18,800 units on the front and back surfaces of a dielectric substrate. Measurements by terahertz time-domain spectroscopy (THz-TDS) confirm a high effective refractive index of 6.66 + j0.123, extremely low reflection power of 1.16%, and the unprecedented high figure of merit (FOM = |n (real)/n (imag)|) of above 300 in the 0.3-THz band. Components with such specifications would enable miniature, high-performance optical elements in the terahertz waveband such as ultrathin flat antennas with high directivity. Further, the concept of the metamaterial with both a high refractive index and extremely low reflection potentially offers a wide range of attractive applications such as solid immersion lenses and cloaking devices.
  Sep. 2017, Research paper (scientific journal), joint, 38, 9, 1866-6892, DOI(公開)(r-map), 1130, 1139
• メタマテリアルでテラヘルツ波帯の光学素子を作る
  鈴木 健仁
  電気学会誌
  Jun. 2017, only, 137, 6, 350, 353
• 高屈折率低反射メタマテリアルを活用した薄フィルム分布屈折率コリメートレンズの設計
  大内 隆嗣, 石原 功基, 佐藤 竜也, 富樫 隆久, 鈴木 健仁
  電子情報通信学会論文誌B
  Mar. 2017, Research paper (scientific journal), joint, J100-B, 3, 235, 244
• Terahertz epsilon-near-zero cut-through metal-slit array antenna
  Suzuki, Takehito; Kimura, Tatsuya; Togashi, Takahisa; Kitahara, Hideaki; Ishihara, Koki; Sato, Tatsuya
  APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
  SPRINGER
  Metamaterials can give rise to unprecedented refractive indices and drive the rapid development of metadevices with on-demand electromagnetic properties. Recent advances in terahertz science demand high-performance optical elements beyond conventional designs of naturally occurring materials in the terahertz wave band. However, how an epsilon-near- zero (ENZ) structure can exploit terahertz metadevices is still not fully demonstrated based on a physical analysis. Here, inspired by the ENZ concept, we demonstrate a design guideline of a terahertz ENZ cut-through metal-slit array antenna. Measurements by a terahertz imagervisualize the beam profile of a terahertz wave, and the measured permittivity of 0.26 agrees well with that of 0.27 obtained by simulation and theory. The terahertz ENZ antenna provides a wide range of potential applications such as high-directivity antennas, beam dividers, beam-steering elements, phase-control devices, and novel filters.
  Feb. 2017, Research paper (scientific journal), joint, 123, 2, 0947-8396, DOI(公開)(r-map)
• 高屈折率・極低反射・低損失なテラヘルツメタマテリアルを実現―産業応用化に向け、テラヘルツデバイスの超小形化・省エネ化へ貢献―
  鈴木 健仁, 石原 功基, 大内 隆嗣
  電子情報通信学会誌
  Feb. 2016, joint, 99, 2, 159, 160
• 高屈折率極低反射メタマテリアルによる0.3 THz帯分布屈折率レンズの提案と設計
  鈴木 健仁, 大内 隆嗣, 石原 功基, 佐藤 竜也, 富樫 隆久, 古謝　望
  レーザー研究 (レーザー学会学術講演会第35回年次大会における招待講演による論文)
  Feb. 2016, Research paper (scientific journal), joint, 44, 2, 116, 120
• Extreme-Sensitivity Terahertz Polarizer Inspired by an Anisotropic Cut-through Metamaterial
  Takehito Suzuki, Masaya Nagai, and Yudai Kishi
  Optics Letters
  Jan. 2016, Research paper (scientific journal), joint, 41, 2, 325, 328
• フレキシブル薄フィルム上2層構造カットワイヤーによるテラヘルツ波用大口径1/4波長板の設計と評価
  鈴木 健仁, 大内 隆嗣, 古謝 望, 石原 功基
  電気学会論文誌E
  Nov. 2015, Research paper (scientific journal), joint, 135, 11, 478, 479
• 金属非対称ペアカットワイヤーによるテラヘルツ波帯での負の屈折率構造の高周波数化の検討
  竹林 佑記, 富樫 隆久, 鈴木 健仁
  電気学会論文誌E
  Nov. 2015, Research paper (scientific journal), joint, 135, 11, 476, 477
• 3次元金属マイクロコイルを装加した金属スリットアレーによるテラヘルツ波帯での負の屈折率設計
  石原 功基, 岸 湧大, 鈴木 健仁
  電気学会論文誌E
  Nov. 2015, Research paper (scientific journal), joint, 135, 11, 466, 473
• 分割リング共振器を装加した金属スリットアレーによるテラヘルツ波帯での負の屈折率設計
  岸 湧大, 鈴木 健仁
  電気学会論文誌E
  Nov. 2015, Research paper (scientific journal), joint, 135, 11, 460, 465
• Quasi-three Dimensional Post Array for Propagation and Focusing of a Terahertz Spoof Surface Plasmon-Polariton
  Nozomu Koja, John C. Young, and Takehito Suzuki
  Applied Physics A
  Jun. 2015, Research paper (scientific journal), joint, 120, 2, 479, 485
• Terahertz Path-Length Lens Composed of Oblique Metal Slit Array
  Takahisa Togashi, Hideaki Kitahara, Keisuke Takano, Masanori Hangyo, Mamoru Mita, John C. Young, and Takehito Suzuki
  Applied Physics A
  Feb. 2015, Research paper (scientific journal), joint, 118, 2, 397, 402
• Terahertz Laminated-structure Polarizer with High Extinction Ratio and Transmission Power
  Yudai Kishi, Masaya Nagai, John C. Young, Keisuke Takano, Masanori Hangyo, and Takehito Suzuki
  Applied Physics Express
  Feb. 2015, Research paper (scientific journal), joint, 8, 3, 032201, 1-4
• Achromatic wave plate in THz frequency region based on parallel metal plate waveguides with a pillar array
  Masaya Nagai, Noriyuki Mukai, Yosuke Minowa, Masaaki Ashida, Takehito Suzuki, Jun Takayanagi, and Hideyuki Ohtake
  Optics Express
  Feb. 2015, Research paper (scientific journal), joint, 23, 4, 4641, 4649
• Spectral Characteristics of Photoconductive Dipole Antennas that Include Photocurrent and Receiving Antenna Effects
  Katsunari Irie, Keisuke Takano, John C. Young, Kohji Yamamoto, Masahiko Tani, and Takehito Suzuki
  Journal of Modeling and Simulation of Antennas and Propagation
  Jan. 2015, Research paper (scientific journal), joint, 1, 1, 20, 24
• A DGFETD Port Formulation for Photoconductive Antenna Analysis
  John C. Young, Darren Boyd, Stephen. D. Gedney, Takehito. Suzuki, Jinjun Liu
  IEEE Antennas and Wireless Propagation Letters
  Oct. 2014, Research paper (scientific journal), joint, 14, -, 386, 389
• Analysis and Design of Concave Lens with Metallic Slit Array for Terahertz Wave Band
  Takehito Suzuki, Hiroki Yonamine, Takuya Konno, John C. Young, Kotaro Murai, Fumiaki Miyamaru, Keisuke Takano, Hideaki Kitahara, and Masanori Hangyo
  Applied Physics A
  May 2014, Research paper (scientific journal), joint, 115, 2, 495, 500
• Parallel Plate Lens with Metal Hole Array for Terahertz Wave Band
  Takehito Suzuki, Hiroki Yonamine, Takuya Konno, John C. Young, Keisuke Takano, and Masanori Hangyo
  Applied Physics A
  May 2014, Research paper (scientific journal), joint, 115, 2, 403, 408
• Focusing Effect Measurements of Artificial Dielectric Multilayer Lens with Metal Rectangular Chips for Terahertz Wave Band
  Yuki Takebayashi, Takuya Konno, Shouhei Shimada, Fumiaki Miyamaru, John C. Young, Hideaki Kitahara, Keisuke Takano, Masanori Hangyo, and Takehito Suzuki
  Applied Physics A
  May 2014, Research paper (scientific journal), joint, 115, 2, 501, 508
• Proposal and Analysis of　Artificial Dielectric Lens with Metallic Corrugated Structures for Terahertz Wave Band
  Takuya Konno, Takahiro Suzuki, John C. Young Mikio Saigusa, Keisuke Takano, Hideaki Kitahara, Masanori Hangyo, and Takehito Suzuki
  Applied Physics A
  Nov. 2012, Research paper (scientific journal), joint, 109, 4, 1103, 1108
• Analysis of artificial dielectric lens with metallic rectangular chips for terahertz wave band and physical explanation by periodic model
  Takehito Suzuki, Tomonari Suzuki, John C. Young, Keisuke Takano, Hideaki Kitahara, and Masanori Hangyo
  Applied Physics A
  Nov. 2012, Research paper (scientific journal), joint, 109, 4, 825, 830
• Iteration-Free Design of a Waveguide Slot Array with Cavities
  Takehito Suzuki, Jiro Hirokawa, Makoto Ando
  IEEE Trans. Antennas and Propagation
  Dec. 2010, Research paper (scientific journal), joint, 58, 12, 3891, 3897
• Dependence of Output Power in Modulated-OFRR on Nonlinear Refractive Index
  Takehito Suzuki, Shi Wei, and Yoh Imai
  Optical Review
  Jun. 2010, Research paper (scientific journal), joint, 17, 3, 327, 330
• Analysis and Design of a Reflection-Cancelling Transverse Slot-Pair Array with Grating-Lobe Suppressing Baffles
  Takehito Suzuki, Jiro Hirokawa, Makoto Ando
  IEICE Trans. Commun.
  Oct. 2009, Research paper (scientific journal), joint, E92-B, 10, 3236, 3242
• Coherence effect on decryption characteristics in message modulation type chaos secure communication system using fiber-optic ring resonators
  Yoh Imai, Satoshi Yamauchi, Hirohisa Yokota, Takehito Suzuki, and Kanesuke Tsuji
  Opt. Commun.
  Oct. 2009, Research paper (scientific journal), joint, 282, -, 4141, 4145
• Analysis and Uniform Design of a Single-layer Slotted Waveguide Array Antenna with Baffles
  Takehito Suzuki, Jiro Hirokawa, Makoto Ando
  IEICE Trans. Commun.
  Jan. 2009, Research paper (scientific journal), joint, E92-B, 01, 150, 158

Presentations

• メタサーフェスと 6G通信用光源の融合に向けて
  第24回マイクロ・ナノ加工研究会公開ミリ波サブミリ波受信機ワークショップ
  Nov. 2023, Oral presentation(invited, special)
• メタサーフェスによるテラヘルツ波帯アンテナと次世代通信用光源の融合に向けて
  ナノ構造ポリマー研究協会第11回マイクロ・ナノ加工研究会公開講演会
  14 Sep. 2023, Oral presentation(invited, special)
• Manipulation of terahertz waves with a right- or left-handed metasurface for directivity enhancement
  IRMMW-THz 2023
  Sep. 2023, Oral presentation(general)
• Absorptive infrared metasurface on 100 nm-thick dielectric membrane
  IRMMW-THz 2023
  Sep. 2023, Oral presentation(general)
• テラヘルツ波帯メタサーフェスアンテナと次世代通信用光源の融合に向けて
  応用物理学会フォトニクス分科会
  Jul. 2023, Oral presentation(invited, special)
• テラヘルツギャップを切り拓く人工構造材料の深化と応用
  日本学術振興会メタマテリアル182委員会
  Apr. 2023, Oral presentation(invited, special)
• Metasurface demonstrating both high refractive index and low reflectance in the infrared region
  The Third International Symposium on Frontiers in THz Technology
  Nov. 2022, Oral presentation(general)
• メタサーフェスによる極限屈折率材料の発見とテラヘルツフラットオプティクスへの応用
  2022年第83回応用物理学秋季学術講演会 シンポジウム 次世代テラヘルツ通信に向けた無線・光融合のデバイス・材料技術
  Sep. 2022, Oral presentation(invited, special)
• Directivity measurement method for metasurface antennas by an alternative to terahertz compact oscillators
  IRMMW-THz 2022
  Aug. 2022, Oral presentation(general)
• Reflectionless metasurface with high refractive index in the 50-THz band for directivity control of thermal radiation
  IRMMW-THz 2022
  Aug. 2022, Oral presentation(general)
• メタサーフェスによるテラヘルツ波帯平面アンテナと6G通信用光源の融合に向けて
  2022年第69回応用物理学春季学術講演会 シンポジウム オンライン時代の機能性マテリアル ～beyond5G/6Gに向けて～
  Mar. 2022, Oral presentation(invited, special)
• メタサーフェスと6G通信用光源の融合に向けて
  テラヘルツ科学の最先端Ⅷ
  Nov. 2021, Oral presentation(invited, special)
• Polarization-independent Reflectionless Metasurface with an Extremely High Refractive Index,
  IRMMW-THz 2021
  Sep. 2021, Oral presentation(general)
• 6G無線通信に向けたテラヘルツメタサーフェス
  日本学術振興会メタマテリアル187委員会
  Sep. 2021, Oral presentation(invited, special)
• High Refractive Index Metasurface For Terahertz Flat Optics
  IRMMW-THz 2020
  Oct. 2020, Oral presentation(general)
• テラヘルツ産業応用のためのメタサーフェス
  MWE 2019
  Nov. 2019, Oral presentation(invited, special)
• Terahertz 3D Components Made from Metamaterials
  IRMMW-THz 2019
  Sep. 2019, Oral presentation(general)
• Free-standing meta-surface on ultrathin Si substrate for high-transmission phase shifts in the 3.0-THz band
  IRMMW-THz 2019
  Sep. 2019, Oral presentation(general)
• テラヘルツ連続発振光源のためのメタサーフェス
  テラヘルツ応用システム研究会
  Aug. 2019, Oral presentation(invited, special)
• テラヘルツ連続発振光源のためのメタサーフェス
  テラヘルツ応用システム研究会(招待講演)
  Aug. 2019, Oral presentation(invited, special)
• Reflectionless metamaterials with high refractive indices for manipulation of thermal radiation
  The 9th International Symposium on Radiative Transfer
  Jun. 2019, Poster presentation
• ポリマー材料を基板にした屈折率10を超える極限屈折率材料
  高分子学会ポリマーフロンティア21
  Mar. 2019, Oral presentation(invited, special)
• Double-sided paired cut wire array antenna for directivity enhancement and control of terahertz sources
  JSPS metamaterials 187, Tokyo Institute of Technology(招待講演)
  Mar. 2019, Oral presentation(invited, special)
• Meta-surfaces with high refractive index and low reflectance in the 50- and 200-THz bands
  JSPS metamaterials 187, Tokyo Institute of Technology
  Mar. 2019, Poster presentation
• Transparent Terahertz Metamaterial with an Extremely Wide Range of Refractive Indices for Antenna Applications
  The Third A3 Metamaterials Forum(招待講演)
  Aug. 2018, Oral presentation(invited, special)
• Terahertz Planar Antenna Inspired by Metamaterial with Extremely High Refractive Index and Low Reflection
  JSPS metamaterials 187(招待講演)
  Mar. 2018, Oral presentation(invited, special)
• Terahertz Metamaterials
  第8回電磁メタマテリアル講演会
  Mar. 2018, Oral presentation(invited, special)
• 超高屈折材料の探索とテラヘルツ波帯デバイス応用
  MWE 2017(招待講演)
  Nov. 2017, Oral presentation(invited, special)
• 超高屈折で極低反射な材料の実現とテラヘルツデバイス応用
  第23回 Core-to-Core若手研究者育成プログラムセミナー
  Oct. 2017, Oral presentation(invited, special)
• テラヘルツ光極限材料の開拓による高性能アンテナと超高感度計測への応用
  応用物理学会テラヘルツ電磁波技術研究会 若手研究者サマースクール 先端研究紹介(招待講演)
  Aug. 2017, Oral presentation(invited, special)
• Terahertz Metamaterial to Demonstrate Extremely Wide Range of Effective Refractive Indices in the 0.3-THz Band
  IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting
  Jul. 2017, Oral presentation(general)
• Terahertz Metamaterials
  日本学術振興会メタマテリアル187委員会(招待講演)
  Dec. 2016, Oral presentation(invited, special)
• Terahertz Component Platforms Inspired by Metamaterials
  The 5th Advanced Lasers and Photon Sources Conference(招待講演)
  May 2016, Oral presentation(invited, special)
• メタマテリアルによるテラヘルツ波高機能制御のための光学素子・アンテナの研究開発　－損失との闘い－
  平成27年電気学会全国大会(招待講演)
  Mar. 2015, Oral presentation(invited, special)
• メタマテリアルによるテラヘルツ波高機能制御のための光学素子・アンテナの研究
  レーザー学会第35回年次大会(招待講演)
  Jan. 2015, Oral presentation(invited, special)
• テラヘルツ波高機能制御のためのメタマテリアルによる光学素子・アンテナの研究
  先端光量子科学アライアンス(APSA)セミナー「テラヘルツセンシング技術の最前線―デバイス開発から基礎・応用研究まで」(招待講演)
  Mar. 2014, Oral presentation(invited, special)
• 電磁メタマテリアルレンズを実装したテラヘルツ波放射検出アンテナの研究開発動向
  電子情報通信学会 テラヘルツ応用システム研究会(招待講演)
  Aug. 2013, Oral presentation(invited, special)
• Parallel Plate Lens with Metal Hole Array for Terahertz Wave Band
  META 2013 4th International Conference on Metamaterials, Photonic Crystals and Plasmonics(招待講演)
  Mar. 2013, Oral presentation(invited, special)
• 高速高精度電磁界解析によるミリ波アンテナ設計とテラヘルツ波帯への展開と課題
  福井大学遠赤外領域開発研究センター招待講演
  May 2010, Oral presentation(invited, special)
• Non-Iterative Design of a 2-D Array of Waveguide Slots with Cavities to give Active Admittance equal to an Isolated Slot
  3rd European Conference on Antennas and Propagation(招待講演)
  Mar. 2009, Oral presentation(invited, special)

Committee Memberships

• 電子情報通信学会 マイクロ波テラヘルツ光電子技術研究会(MWPTHz)
  専門委員
  From 20220609, To 20240605
• 日本学術振興会 産学協力研究委員会(メタマテリアル第187委員会)
  委員
  From 20200401, To 20230331

Media Coverage

• 赤外線吸収メタサーフェス開発東京農工大が極薄100ナノメートルテラヘルツ波アンテナなど技術応用目指す
  農工大の朝田晴美大学院生と鈴木健二准教授らが、厚みが100ナノメートルと極めて薄い赤外線メタサーフェスを開発したと掲載される。
  EurekAlert!／Phys.Org／News-Medical.Net
  From 14 Mar. 2024, To 14 Mar. 2024
• 両面同時電子ビーム露光法で作製厚み100nm級の赤外線吸収メタサーフェスを開発
  農工大工が鵜研究員先端電気電子部門の鈴木健二准教授と工学府電子情報工学専攻の朝田晴美氏らは、厚さ100nm級という極めて薄い「赤外線吸収メタサーフェス」を開発したと発表した、と紹介された。
  EE Times Japan
  From 08 Mar. 2024, To 08 Mar. 2024
• 厚さ100nm級の赤外線吸収メタサーフェスを作製――物体検出やイメージング、距離測定などでの活用に期待　東京農工大学
  fabcross for エンジニア
  From 06 Mar. 2024, To 06 Mar. 2024
• 厚さ100ナノメートル級の極薄赤外線吸収メタサーフェスを実現
  The team, led by Takehito Suzuki, Associate Professor at the Tokyo University of Agriculture and Technology (TUAT) Institute of Engineering successfully tested reflectionless, highly refractive index metasurface that may eventually be used in practical applications to send, receive, and manipulate light and radio waves in the terahertz waveband (THz).
  アドコム・メディア・オンライン書店
  From 06 Mar. 2024, To 06 Mar. 2024
• 東京農工大とJST、厚さ100ナノメール級の極めて薄い赤外線吸収メタサーフェスを実現
  日本経済新聞プレスリリース
  From 05 Mar. 2024, To 05 Mar. 2024
• 農工大，極めて薄い赤外線吸収メタサーフェスを実現
  OPTRONICS ONLINE
  From 05 Mar. 2024, To 05 Mar. 2024
• 厚さ１００ナノメール級の極めて薄い赤外線吸収メタサーフェスを実現 ～熱マネジメントやイメージング、そして新たな作製技術は次世代情報通信デバイスへも～
  テック・アイ技術情報研究所
  From 05 Mar. 2024, To 05 Mar. 2024
• 「ガリレオX」
  農工大 鈴木先生が出演、研究について放映される。
  NIKKEI Asia
  From 10 Sep. 2023, To 10 Sep. 2023
• 【NEW TECH】無偏光・超高屈折率・低反射率を実現するスーパー材料開発
  0.3テラヘルツで動作する、無偏光・超高屈折率・低反射率の新素材「メタサーフェス」を開発したと、紹介される。
  コンバーテック
  From 15 Jul. 2023, To 15 Jul. 2023
• 農工大がテラヘルツ波に新材料、高屈折と低反射を両立
  テラヘルツ波のあらゆる偏光に対して高い屈折率と低い反射率を両立した新しい人工構造材料を農工大の鈴木准教授らが試作した、と紹介される。
  日経クロステック
  From 15 Jun. 2023, To 15 Jun. 2023
• 農工大、高屈折・低反射の新材料　テラヘルツ波向け
  テラヘルツ波のあらゆる偏光に対して高い屈折率と低い反射率を両立した新しい人工構造材料を東京農工大学が試作した、と紹介される。
  NIKKEI Tech Foresight
  From 14 Jun. 2023, To 14 Jun. 2023
• 無偏光・超高屈折率・低反射率新材料「メタサーフェス」開発　東京農工大　
  農工大大学院・佐藤さん、鈴木准教授は0.3ﾃﾗﾍﾙﾂで動作する、無偏光・超高屈折率・低反射率の新素材「メタサーフェス」を開発し、これを用いたメタレンズアンテナと光源の融合に向けた研究を進めていると紹介される。
  科学新聞
  From 09 Jun. 2023, To 09 Jun. 2023
• レーザー鈴木さん熱を曲げる
  「まだ好奇心の研究の範囲だが飛んでいる熱を曲げられるかもしれない」と期待するのは、東京農工大学准教授の鈴木健仁さん、というコメントが紹介される。
  日刊工業新聞
  From 07 Jun. 2023, To 07 Jun. 2023
• 0.3テラヘルツで動作する無偏光／超高屈折率／低反射率の新材料を開発　東京農工大学
  東京農工大学大学院の鈴木健仁准教授らの研究グループは2023年5月30日、0.3テラヘルツ (波長：1mm) で動作する、無偏光／超高屈折率／低反射率の新材料（メタサーフェス）を開発したと発表したと紹介される。
  fabcross for エンジニア
  From 02 Jun. 2023, To 02 Jun. 2023
• テラヘルツ波向けメタサーフェス　農工大、6Gなど提案　屈折率 シリコンの4倍
  東京農工大学の鈴木健仁准教授らは、テラヘルツ波を透過させて曲げる人口構造体「メタサーフェス」を開発したと紹介される。
  日刊工業新聞
  From 01 Jun. 2023, To 01 Jun. 2023
• 東京農工大、テラヘルツ波向け「メタサーフェス」開発　6Gなどに提案へ
  東京農工大学の鈴木健仁准教授らは、テラヘルツ波を透過させて曲げる人口構造体「メタサーフェス」を開発したと紹介される。
  日刊工業新聞　Web版
  From 01 Jun. 2023, To 01 Jun. 2023
• 「6G」向け電波制御材料を安く　東北大が量産手法開発Next Tech2050
  東京農工大学の鈴木健仁准教授らの研究チームが、テラヘルツ波の屈折率が高い独自の人工材料でレンズを開発したことが紹介される。
  日経産業新聞
  From 28 Mar. 2022, To 28 Mar. 2022
• 産学連携でイノベーションを起こせ! 革新的な平面レンズが見せる、日本経済の生きる道
  産学連携の例として、東京農工大学とローム株式会社が、独自材料を用いて、テラヘルツ発振器に最適な世界トップクラスの極短焦点な平面レンズを共同開発し、7月7日に発表したことが紹介される。
  財経新聞／エコノミックニュース
  From 18 Jul. 2021, To 18 Jul. 2021
• メタレンズでテラヘルツ発振器の高指向性化に成功、6Gへの展開に期待
  東京農工大学大学院がロームと共同で、超高屈折率かつ無反射のメタサーフェス材料を使って、焦点距離1mmと極短焦点の平面レンズ（メタレンズ）を開発したことが紹介される。
  yahooニュース／MONOist
  From 16 Jul. 2021, To 16 Jul. 2021
• 東京農工大とローム、超高屈折率・無反射な新材料により焦点距離1ミリメートルの極短焦点な平面レンズを実現
  日本経済新聞プレスリリース
  From 08 Jul. 2021, To 08 Jul. 2021
• 高指向性　パワー密度３倍テラヘルツ波用レンズ　発信器を小型化
  東京農工大学の鈴木健仁准教授と佐藤健都大学院生らがロームと共同で、厚さ24ﾏｲｸﾛﾒｰﾄﾙのテラヘルツ波用レンズを開発したことが紹介される。
  日刊工業新聞／WEB
  From 08 Jul. 2021, To 08 Jul. 2021
• Ultra-Short Collimating Metalens Could Promote Wireless Communications
  AZO OPTICS
  From 08 Jul. 2021, To 08 Jul. 2021
• Collimating metalens puts focus on 6G communications
  THE ENGINNER
  From 08 Jul. 2021, To 08 Jul. 2021
• Ultra-short collimating metalens with a distance of only one millimeter.
  NEWS BREAK
  From 07 Jul. 2021, To 07 Jul. 2021
• Search Results for: Wireless communications may get a boost from ultra-short collimating metalens
  BIOTECH Asia news
  From 07 Jul. 2021, To 07 Jul. 2021
• Beyond 5G: Wireless communications may get a boost from ultra-short collimating metalens
  Takehito Suzuki, associate professor at Tokyo University of Agriculture and Technology have taken a step toward such application developments by using their metasurface to craft the world's best ultra-short metalens that collimates to align an optical system with a distance of only one millimeter.
  PHYS ORG
  From 07 Jul. 2021, To 07 Jul. 2021
• レーザー　次は部材
  東京農工大学の鈴木健仁准教授の「テラヘルツ波の光源は充実してきた。次は光を自由に操る部材が重要だ」というコメントが紹介される。
  日刊工業新聞／WEB
  From 20 May 2021, To 21 May 2021
• コカトピ！　電磁波をコントロールするレンズ
  東京農工大学大学院の鈴木健仁准教授と修士課程の遠藤孝太さん、修士課程卒業の近藤諭さんが、周波数1THz以上の電磁波を操作できるテラヘルツメタレンズの設計指針を構築したことが紹介される。
  子供の科学
  From 10 Sep. 2020, To 10 Sep. 2020
• Underused part of the electromagnetic spectrum gets optics boost from metamaterial
  Researchers at Tokyo University of Agriculture and Technology (TUAT) led by Associate Professor and terahertz wave engineer Takehito Suzuki have recently developed an optical component that can more easily manipulate T-rays and in a practical fashion—by using a material that doesn't occur in nature.
  PHYS ORG
  From 14 Jul. 2020, To 14 Jul. 2020

Professional Memberships

• 応用物理学会
• 電子情報通信学会
• IEEE

Awards

• 公益社団法人 応用物理学会
  第45回応用物理学会論文賞 応用物理学会優秀論文賞
  「Resonant tunneling diode integrated with metalens for high-directivity terahertz waves」
  応用物理学の研究において優れた業績をあげた者に対して、その功績をたたえ授与される。
  22 Mar. 2024
• 文部科学省マテリアル先端リサーチインフラ
  令和4年度 秀でた利用成果 優秀賞
  電子ビーム露光によるSiNxメンブレンの表と裏両面への正方形Auパッチの作製
  文部科学省マテリアル先端リサーチインフラ(旧名称：ナノテクノロジープラットフォーム)を利用して進められた研究課題の中で、イノベーションに繋がることが期待できるなど特に秀逸な成果を上げた課題として評価され、「秀でた利用成果」優秀賞に選出されました。「秀でた利用成果」には、利用課題の中から6件が選ばれました。
  01 Feb. 2023
• 電子情報通信学会
  電子情報通信学会末松安晴賞
  Jun. 2020
• 第18回船井学術賞
  Apr. 2019
• 平成29年度科学技術分野の文部科学大臣表彰 若手科学者賞
  Apr. 2017
• 電子情報通信学会 エレクトロニクスソサイエティ活動功労表彰
  Mar. 2017
• 公益財団法人 矢崎科学技術振興記念財団 矢崎学術賞(奨励賞)
  Mar. 2017
• 第5回新化学技術研究奨励賞
  May 2016
• 平成27年度工学系学生表彰 (指導学生8名) (茨城大学工学部平成生まれの会(OB会)の取り組み)
  Mar. 2016
• YEP AWARD 2015
  Mar. 2016
• 財団法人 宇部興産学術振興財団 第53回学術奨励賞
  Jun. 2013
• 平成23年度学生表彰(学長表彰) (指導学生) (第9回リバネス研究費 若手スタートアップ賞による受賞)
  Mar. 2012
• 平成23年度茨城大学工学系学生表彰 (指導学生) (第9回リバネス研究費 若手スタートアップ賞による受賞)
  Feb. 2012
• 公益財団法人高柳健次郎財団第28回2011年研究奨励賞
  Jan. 2012
• 第9回リバネス研究費 若手スタートアップ賞 (指導学生) (共同受賞)
  Dec. 2011
• 平成23年度茨城大学学長学術表彰奨励賞
  Oct. 2011
• 船井研究奨励賞
  May 2011
• 第23回安藤博記念学術奨励賞
  Jun. 2010
• 電子情報通信学会 アンテナ・伝播研究会 若手奨励賞
  Jun. 2009
• 2008 INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION (ISAP2008) Best Student Paper Award Second Prize
  Oct. 2008
• The 3rd IEEE Tokyo Young Researchers Workshop 日本無線スポンサー特別賞
  Dec. 2006