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Keisuke Takano
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Journal Articles

Broadband and efficient terahertz helicity inversion by a reconfigurable reflective metasurface based on vanadium dioxide

Akira Inokuma, Keisuke Takano, Toshihiro Nakanishi, Fumiaki Miyamaru, Kunio Okimura, Atsushi Sanada, Yosuke Nakata
Journal: Applied Physics Letters
Appl. Phys. Lett. 125, 081703 (2024)
https://doi.org/10.1063/5.0220688
Published: August 2024
View article titled, Broadband and efficient terahertz helicity inversion by a reconfigurable reflective metasurface based on vanadium dioxide
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Journal Articles

Insertion effects of natural dielectric between artificial dielectrics formed by metallic sub-wavelength slit arrays

Yasunori Tokuda, Keisuke Takano, Koichiro Sakaguchi, Kosaku Kato, Makoto Nakajima, Koichi Akiyama
Journal: AIP Advances
AIP Advances 8, 095305 (2018)
https://doi.org/10.1063/1.5043149
Published: September 2018
View article titled, Insertion effects of natural dielectric between artificial dielectrics formed by metallic sub-wavelength slit arrays
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Journal Articles

Waveguide resonance mode response of stacked structures of metallic sub-wavelength slit arrays

Yasunori Tokuda, Keisuke Takano, Koichiro Sakaguchi, Kosaku Kato, Makoto Nakajima, Koichi Akiyama
Journal: Journal of Applied Physics
J. Appl. Phys. 123, 183102 (2018)
https://doi.org/10.1063/1.5027301
Published: May 2018
View article titled, Waveguide resonance mode response of stacked structures of metallic sub-wavelength slit arrays
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Journal Articles

Quantized conductance observed during sintering of silver nanoparticles by intense terahertz pulses

Editor’s Pick
Keisuke Takano, Hirofumi Harada, Masashi Yoshimura, Makoto Nakajima
Journal: Applied Physics Letters
Appl. Phys. Lett. 112, 163102 (2018)
https://doi.org/10.1063/1.5022706
Published: April 2018
View article titled, Quantized conductance observed during sintering of silver nanoparticles by intense terahertz pulses
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Includes: Supplementary data
Journal Articles

Energy loss of terahertz electromagnetic waves by nano-sized connections in near-self-complementary metallic checkerboard patterns

Keisuke Takano, Yoku Tanaka, Gabriel Moreno, Abdallah Chahadih, Abbas Ghaddar, Xiang-Lei Han, François Vaurette, Yosuke Nakata, Fumiaki Miyamaru, Makoto Nakajima, Masanori Hangyo, Tahsin Akalin
Journal: Journal of Applied Physics
J. Appl. Phys. 122, 063101 (2017)
https://doi.org/10.1063/1.4997882
Published: August 2017
View article titled, Energy loss of terahertz electromagnetic waves by nano-sized connections in near-self-complementary metallic checkerboard patterns
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Journal Articles

Strong yellow emission of high-conductivity bulk ZnO single crystals irradiated with high-power gyrotron beam

Kosaku Kato, Hongsong Qiu, Eduard M. Khutoryan, Yoshinori Tatematsu, Masahiko Tani, Toshitaka Idehara, Yuusuke Yamaguchi, Masafumi Fukunari, Yuto Maeda, Kyoya Takayama, Yuki Minami, Melvin John F. Empizo, Takayuki Kurihara, Kohei Yamanoi, Toshihiko Shimizu, Keisuke Takano, Nobuhiko Sarukura, Tsuguo Fukuda, Masashi Yoshimura, Makoto Nakajima
Journal: Applied Physics Letters
Appl. Phys. Lett. 111, 031108 (2017)
https://doi.org/10.1063/1.4994316
Published: July 2017
View article titled, Strong yellow emission of high-conductivity bulk ZnO single crystals irradiated with high-power gyrotron beam
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Journal Articles

Optical damage assessment and recovery investigation of hydrogen-ion and deuterium-ion plasma-irradiated bulk ZnO single crystals

Melvin John F. Empizo, Kohei Yamanoi, Kazuyuki Mori, Keisuke Iwano, Yuki Iwasa, Yuki Minami, Ren Arita, Kazuhito Fukuda, Keisuke Takano, Toshihiko Shimizu, Makoto Nakajima, Masashi Yoshimura, Nobuhiko Sarukura, Takayoshi Norimatsu, Masanori Hangyo, Hiroshi Azechi, Tsuguo Fukuda, Bess G. Singidas, Roland V. Sarmago, Makoto Oya, Yoshio Ueda
Journal: Journal of Applied Physics
J. Appl. Phys. 121, 175102 (2017)
https://doi.org/10.1063/1.4982346
Published: May 2017
View article titled, Optical damage assessment and recovery investigation of hydrogen-ion and deuterium-ion plasma-irradiated bulk ZnO single crystals
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Journal Articles

Multiple intersection properties of optical resonance modes in metallic metamaterials

Yasunori Tokuda, Koichiro Sakaguchi, Yuki Yamaguchi, Keisuke Takano
Journal: AIP Advances
AIP Advances 7, 035209 (2017)
https://doi.org/10.1063/1.4978616
Published: March 2017
View article titled, Multiple intersection properties of optical resonance modes in metallic metamaterials
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Journal Articles

Optical transmittance investigation of 1-keV ion-irradiated sapphire crystals as potential VUV to NIR window materials of fusion reactors

Keisuke Iwano, Kohei Yamanoi, Yuki Iwasa, Kazuyuki Mori, Yuki Minami, Ren Arita, Takuma Yamanaka, Kazuhito Fukuda, Melvin John F. Empizo, Keisuke Takano, Toshihiko Shimizu, Makoto Nakajima, Masashi Yoshimura, Nobuhiko Sarukura, Takayoshi Norimatsu, Masanori Hangyo, Hiroshi Azechi, Bess G. Singidas, Roland V. Sarmago, Makoto Oya, Yoshio Ueda
Journal: AIP Advances
AIP Advances 6, 105108 (2016)
https://doi.org/10.1063/1.4965927
Published: October 2016
View article titled, Optical transmittance investigation of 1-keV ion-irradiated sapphire crystals as potential VUV to NIR window materials of fusion reactors
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Journal Articles

Dispersion, spatial growth rate, and start current of a Cherenkov free-electron laser with negative-index material

Yuanyuan Wang, Yanyu Wei, Dazhi Li, Keisuke Takano, Makoto Nakajima, Xuebing Jiang, Xianfeng Tang, Xianbao Shi, Yubin Gong, Jinjun Feng, Shuji Miyamoto
Journal: Physics of Plasmas
Phys. Plasmas 22, 083111 (2015)
https://doi.org/10.1063/1.4928089
Published: August 2015
View article titled, Dispersion, spatial growth rate, and start current of a Cherenkov free-electron laser with negative-index material
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Journal Articles

Investigation of fade-out mechanism of resonance modes in optical transmission using stacked metallic sub-wavelength slit arrays

Yasunori Tokuda, Koichiro Sakaguchi, Keisuke Takano, Takehiro Fukushima, Masanori Hangyo
Journal: Journal of Applied Physics
J. Appl. Phys. 115, 243104 (2014)
https://doi.org/10.1063/1.4885759
Published: June 2014
View article titled, Investigation of fade-out mechanism of resonance modes in optical transmission using stacked metallic sub-wavelength slit arrays
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Journal Articles

Polarization property of terahertz wave emission from gammadion-type photoconductive antennas

Hiromasa Suo, Keisuke Takano, Seigo Ohno, Hiroyuki Kurosawa, Kazuyuki Nakayama, Teruya Ishihara, Masanori Hangyo
Journal: Applied Physics Letters
Appl. Phys. Lett. 103, 111106 (2013)
https://doi.org/10.1063/1.4820821
Published: September 2013
View article titled, Polarization property of terahertz wave emission from gammadion-type photoconductive antennas
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Journal Articles

Tuning the effective refractive index of a thin air gap region sandwiched by metallic metamaterials by lateral displacements

Koichi Akiyama, Kyoji Shibuya, Keisuke Takano, Yuji Abe, Yasunori Tokuda, Masanori Hangyo
Journal: Journal of Applied Physics
J. Appl. Phys. 113, 243103 (2013)
https://doi.org/10.1063/1.4812384
Published: June 2013
View article titled, Tuning the effective refractive index of a thin air gap region sandwiched by metallic metamaterials by lateral displacements
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Journal Articles

Remarkable transmission characteristics of optical waves through modulated double-layered metallic slit arrays

Yasunori Tokuda, Koichiro Sakaguchi, Keisuke Takano, Takehiro Fukushima, Masanori Hangyo
Journal: AIP Advances
AIP Advances 2, 042112 (2012)
https://doi.org/10.1063/1.4759130
Published: October 2012
View article titled, Remarkable transmission characteristics of optical waves through modulated double-layered metallic slit arrays
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Journal Articles

Optical switching of terahertz radiation from meta-atom-loaded photoconductive antennas

Keisuke Takano, Yui Chiyoda, Tsubasa Nishida, Fumiaki Miyamaru, Taku Kawabata, Hirofumi Sasaki, Mitsuo W. Takeda, Masanori Hangyo
Journal: Applied Physics Letters
Appl. Phys. Lett. 99, 161114 (2011)
https://doi.org/10.1063/1.3654156
Published: October 2011
View article titled, Optical switching of terahertz radiation from meta-atom-loaded photoconductive antennas
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Journal Articles

Electron density measurement of inductively coupled plasmas by terahertz time-domain spectroscopy (THz-TDS)

Ayumi Ando, Tomoko Kurose, Vivien Reymond, Katsuhisa Kitano, Hideaki Kitahara, Keisuke Takano, Masahiko Tani, Masanori Hangyo, Satoshi Hamaguchi
Journal: Journal of Applied Physics
J. Appl. Phys. 110, 073303 (2011)
https://doi.org/10.1063/1.3633488
Published: October 2011
View article titled, Electron density measurement of inductively coupled plasmas by terahertz time-domain spectroscopy (TH<sc>z</sc>-TDS)
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Journal Articles

Three-dimensional bulk metamaterials operating in the terahertz range

Fumiaki Miyamaru, Shiro Kuboda, Kazuo Taima, Keisuke Takano, Masanori Hangyo, Mitsuo Wada Takeda
Journal: Applied Physics Letters
Appl. Phys. Lett. 96, 081105 (2010)
https://doi.org/10.1063/1.3327830
Published: February 2010
View article titled, Three-dimensional bulk metamaterials operating in the terahertz range
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Journal Articles

A metal-to-insulator transition in cut-wire-grid metamaterials in the terahertz region

Keisuke Takano, Kyoji Shibuya, Koichi Akiyama, Takeshi Nagashima, Fumiaki Miyamaru, Masanori Hangyo
Journal: Journal of Applied Physics
J. Appl. Phys. 107, 024907 (2010)
https://doi.org/10.1063/1.3284958
Published: January 2010
View article titled, A metal-to-insulator transition in cut-wire-grid metamaterials in the terahertz region
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