Graphene-loaded metal wire grating for deep and broadband THz modulation in total internal reflection geometry

Sun, Yiwen and Degl'Innocenti, Riccardo and Ritchie, David and Beere, Harvey and Xiao, Long and Ruggiero, Michael and Zeitler, J. Axel and Stantchev, Rayko and Chen, Danny and Peng, Zhengchun and MacPherson, Emma and Liu, Xudong (2018) Graphene-loaded metal wire grating for deep and broadband THz modulation in total internal reflection geometry. Photonics Research, 6 (12). pp. 1151-1157. ISSN 2327-9125

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Abstract

We employed a metallic wire grating loaded with graphene and operating in total internal reflection (TIR) geometry to realize deep and broadband THz modulation. The non-resonant field enhancement effect of the evanescent wave in TIR geometry and in the subwavelength wire grating was combined to demonstrate a∼ 77% modulation depth (MD) in the frequency range of 0.2 –1.4 THz. This MD, achieved electrically with a SiO2∕Si gated graphene device, was 4.5 times higher than that of the device without a metal grating in transmission geometry. By optimizing the parameters of the metallic wire grating, the required sheet conductivity of graphene for deep modulation was lowered to 0.87 mS. This work has potential applications in THz communication and real-time THz imaging

Item Type:
Journal Article
Journal or Publication Title:
Photonics Research
Additional Information:
© 2018 Optical Society of America. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3107
Subjects:
ID Code:
129125
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Deposited On:
26 Nov 2018 15:56
Refereed?:
Yes
Published?:
Published
Last Modified:
26 Sep 2020 05:41