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

Research output: Contribution to journalJournal articlepeer-review

Published
  • Yiwen Sun
  • Riccardo Degl'Innocenti
  • David Ritchie
  • Harvey Beere
  • Long Xiao
  • Michael Ruggiero
  • J. Axel Zeitler
  • Rayko Stantchev
  • Danny Chen
  • Zhengchun Peng
  • Emma MacPherson
  • Xudong Liu
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<mark>Journal publication date</mark>21/11/2018
<mark>Journal</mark>Photonics Research
Issue number12
Volume6
Number of pages7
Pages (from-to)1151-1157
Publication StatusPublished
Early online date26/10/18
<mark>Original language</mark>English

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

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© 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.