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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Graphene-loaded metal wire grating for deep and broadband THz modulation in total internal reflection geometry
AU - Sun, Yiwen
AU - Degl'Innocenti, Riccardo
AU - Ritchie, David
AU - Beere, Harvey
AU - Xiao, Long
AU - Ruggiero, Michael
AU - Zeitler, J. Axel
AU - Stantchev, Rayko
AU - Chen, Danny
AU - Peng, Zhengchun
AU - MacPherson, Emma
AU - Liu, Xudong
N1 - © 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.
PY - 2018/11/21
Y1 - 2018/11/21
N2 - 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
AB - 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
KW - graphene
KW - Terahertz
KW - Modulators
KW - grating
U2 - 10.1364/PRJ.6.001151
DO - 10.1364/PRJ.6.001151
M3 - Journal article
VL - 6
SP - 1151
EP - 1157
JO - Photonics Research
JF - Photonics Research
SN - 2327-9125
IS - 12
ER -