Journal
APPLIED PHYSICS EXPRESS
Volume 15, Issue 7, Pages -Publisher
IOP Publishing Ltd
DOI: 10.35848/1882-0786/ac727c
Keywords
graphene; dielectric grating; surface plasmons
Categories
Funding
- National Natural Science Foundation of China [62075058, U1804261]
- Outstanding Youth Foundation of Henan Normal University [2020JQ02]
- Natural Science Foundation of Henan Province [222300420011, 222300420209]
- Project of Science and Technology of the Henan Province in China [212102310907]
- Doctoral Fund of Henan University of Engineering [D2017013]
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An active plasmonic device is designed to support multiple perfect absorption peaks by exciting highly concentrated graphene surface plasmons through silicon-based diffractive gratings. The absorption spectrum can be effectively controlled over a wide wavelength range by changing the Fermi levels, relaxation time of the graphene, and geometric parameters of the device.
An active plasmonic device is designed to support multiple perfect absorption peaks using the highly confined graphene surface plasmons excited by silicon-based diffractive gratings. The physical origination corresponding to different absorption peaks is analyzed and the principle of impedance matching is used to explain perfect absorption. We show that the absorption spectrum is effectively controllable over a wide wavelength range by changing the Fermi levels, relaxation time of the graphene and geometric parameters of the device. This study could provide some possibilities facilitating the design of next-generation optical and photoelectronic structures by combining graphene and dielectric grating.
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