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

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Sun, Yiwen, Degl'Innocenti, Riccardo, Ritchie, David A., Beere, Harvey E., Xiao, Long, Ruggiero, Michael, Zeitler, J. Axel, Stantchev, Rayko I., Chen, Danni, Peng, Zhengchun, Pickwell-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. doi:10.1364/PRJ.6.001151 ISSN 2327-9125.

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Official URL: https://doi.org/10.1364/PRJ.6.001151

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Abstract

We employed a metallic wire grating loaded with graphene and operating in total internal reflection (TIR) geometry to realise deep and broadband THz modulation. The non-resonant field enhancement effect of the evanescent wave in the 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 SiO2/Si gated graphene device, was 4.5 times higher than the device without metal grating in transmission geometry. By optimizing the parameters of 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
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Terahertz technology, Graphene -- Industrial applications
Journal or Publication Title: Photonics Research
Publisher: Optical Society of America
ISSN: 2327-9125
Official Date: 21 November 2018
Dates:
DateEvent
21 November 2018Published
26 October 2018Available
24 October 2018Accepted
Volume: 6
Number: 12
Page Range: pp. 1151-1157
DOI: 10.1364/PRJ.6.001151
Status: Peer Reviewed
Publication Status: Published
Reuse Statement (publisher, data, author rights): © 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.
Access rights to Published version: Open Access (Creative Commons)
Date of first compliant deposit: 7 November 2018
Date of first compliant Open Access: 26 October 2019
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
61575125[NSFC] National Natural Science Foundation of Chinahttp://dx.doi.org/10.13039/501100001809
61671308[NSFC] National Natural Science Foundation of Chinahttp://dx.doi.org/10.13039/501100001809
YQ2015141Department of Education of Guangdong Provincehttp://dx.doi.org/10.13039/501100010226
2015TQ01R453Natural Science Foundation of Guangdong Provincehttp://dx.doi.org/10.13039/501100003453
Global travel fundChinese University of Hong Konghttp://dx.doi.org/10.13039/501100004853
14201415Research Grants Council, University Grants Committeehttp://dx.doi.org/10.13039/501100002920
ITS/371/16Innovation and Technology Commissionhttp://dx.doi.org/10.13039/501100003452
EP/N022769/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
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