Author:
Wu Jun,Sun Yasong,Wu Feng,Wu Biyuan,Wu Xiaohu
Abstract
A tunable graphene absorber, composed of a graphene monolayer and a substrate spaced by a subwavelength dielectric grating, is proposed and investigated. Strong light absorption in the graphene monolayer is achieved due to the formation of embedded optical quasi-bound states in the continuum in the subwavelength dielectric grating. The physical origin of the absorption with high quality factor is examined by investigating the electromagnetic field distributions. Interestingly, we found that the proposed absorber possesses high spatial directivity and performs similar to an antenna, which can also be utilized as a thermal emitter. Besides, the spectral position of the absorption peak can not only be adjusted by changing the geometrical parameters of dielectric grating, but it is also tunable by a small change in the Fermi level of the graphene sheet. This novel scheme to tune the absorption of graphene may find potential applications for the realization of ultrasensitive biosensors, photodetectors, and narrow-band filters.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Zhejiang Province
Natural Science Foundation of Anhui Province
Natural Science Foundation of Shandong Province
Subject
Electrical and Electronic Engineering,General Physics and Astronomy,General Materials Science
Cited by
3 articles.
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