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Sensors 2016, 16(12), 2039; doi:10.3390/s16122039

Tunable Multiple-Step Plasmonic Bragg Reflectors with Graphene-Based Modulated Grating

1
School of Science, Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Jiangnan University, Wuxi 214122, China
2
Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 17 October 2016 / Revised: 25 November 2016 / Accepted: 25 November 2016 / Published: 1 December 2016
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [2501 KB, uploaded 1 December 2016]   |  

Abstract

We propose a novel plasmonic Bragg reflector (PBR) based on graphene with multiple-step silicon structure. The monolayer graphene bears locally variable optical properties by modulation of electric fields, and the periodical change of effective refractive index on graphene can be obtained by external bias voltage in the mid-infrared region. Through patterning the PBR units into multiple-step structures, we can decrease the insertion loss and suppress the rippling in transmission spectra. By introducing the defect into the multiple-step PBRs, the multiple resonance modes are formed inside the stopband by increasing the step number. This work may pave the ways for the further development of ultra-compact low-cost hyperspectral sensors in the mid-infrared region. View Full-Text
Keywords: plasmonics; Bragg grating sensor; metal-insulator-metal; finite element method plasmonics; Bragg grating sensor; metal-insulator-metal; finite element method
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Qian, Q.; Liang, Y.; Liang, Y.; Shao, H.; Zhang, M.; Xiao, T.; Wang, J. Tunable Multiple-Step Plasmonic Bragg Reflectors with Graphene-Based Modulated Grating. Sensors 2016, 16, 2039.

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