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Multiple-band enhanced light absorption of monolayer graphene with critical coupling to guided mode resonance

Authors :
Xiujuan Zou
Gaige Zheng
Fenglin Xian
Yun-yun Chen
Linhua Xu
Min Lai
Source :
AIP Advances, Vol 8, Iss 12, Pp 125102-125102-7 (2018)
Publication Year :
2018
Publisher :
AIP Publishing, 2018.

Abstract

We investigate subwavelength grating-coupled distributed Bragg reflector (DBR) in order to achieve total absorption at preselected wavelengths in a graphene monolayer. Multispectral and near-unity absorption (approximately 99.44% of the incident light at normal incidence) can be achieved in the proposed photonic structure at near-infrared (NIR) regimes. When the system meets the condition of critical coupling, the excited guided mode resonance (GMR) occurs at the resonance wavelength, and the corresponding electric field intensity around the graphene sheet can be greatly enhanced due to the reinforced light-graphene interaction. Multiple absorption peaks can be tuned within the wavelength region of 1.3 μm to 1.6 μm by varying the structural parameters. Our findings also indicate that the near-total-absorption peaks are highly dependent on the number and thickness of unit cells in DBR. These features make the proposed structure have great potential in applications of scalable perfect absorbers (PAs).

Details

ISSN :
21583226
Volume :
8
Database :
OpenAIRE
Journal :
AIP Advances
Accession number :
edsair.doi.dedup.....e5f79814fc60ca01ca9413de67da1206
Full Text :
https://doi.org/10.1063/1.5048973