We demonstrate the broadband operation of a switchable terahertz quarter-wave plate achieved with an active metasurface employing vanadium dioxide. For this purpose, we utilize anisotropically deformed checkerboard structures, which present broadband characteristics compatible with deep modulation. Moreover, the metasurface is integrated with a current injection circuit to achieve state switching; this injection circuit can also be employed to monitor the electric state of vanadium dioxide. We estimate the Stokes parameters derived from the experimental transmission spectra of the fabricated metasurface and confirm the helicity switching of circularly polarized waves near a designed frequency of 0.66 THz. The relative bandwidth is evaluated to be 0.52, which is 4.2 times broader than that in a previous study.
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31 August 2020
Research Article|
September 01 2020
Broadband operation of active terahertz quarter-wave plate achieved with vanadium-dioxide-based metasurface switchable by current injection
Toshihiro Nakanishi
;
Toshihiro Nakanishi
a)
1
Department of Electronic Science and Engineering, Kyoto University
, Kyoto 615-8510, Japan
a)Author to whom correspondence should be addressed: t-naka@kuee.kyoto-u.ac.jp
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Yosuke Nakata
;
Yosuke Nakata
2
Graduate School of Engineering Science, Osaka University
, Osaka 560-8531, Japan
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Yoshiro Urade
;
Yoshiro Urade
3
Center for Emergent Matter Science, RIKEN
, Saitama 351-0198, Japan
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Kunio Okimura
Kunio Okimura
4
School of Engineering, Tokai University
, Kanagawa 259-1292, Japan
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a)Author to whom correspondence should be addressed: t-naka@kuee.kyoto-u.ac.jp
Appl. Phys. Lett. 117, 091102 (2020)
Article history
Received:
June 22 2020
Accepted:
August 20 2020
Citation
Toshihiro Nakanishi, Yosuke Nakata, Yoshiro Urade, Kunio Okimura; Broadband operation of active terahertz quarter-wave plate achieved with vanadium-dioxide-based metasurface switchable by current injection. Appl. Phys. Lett. 31 August 2020; 117 (9): 091102. https://doi.org/10.1063/5.0019265
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