Tunable perfect dual-narrowband absorber based on graphene-photonic crystal heterostructure

被引：22

作者：

Wu, Yuexiang ^{[1
]}

Wu, Weiqiang ^{[1
]}

Hu, Jiashun ^{[1
]}

机构：

[1] Shenzhen Polytech, Sch Elect & Commun Engn, Shenzhen 518055, Peoples R China

来源：

RESULTS IN PHYSICS | 2022年 / 34卷

关键词：

Absorber; Photonic crystal; Optical Tamm states; Graphene;

D O I：

10.1016/j.rinp.2022.105234

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A dual-narrowband absorber in the terahertz (THz) band is proposed and numerically analyzed, which consists of a sheet of graphene on a photonic crystal (PC) heterostructure. We find a huge enhancement of absorption because optical Tamm states (OTSs) are excited at the interfaces of graphene-PC and PC heterostructure. The full width at half maximum (FWHM) of the absorption peak near the wavelength of 300 mu m can be as narrow as 1.25 mu m, and narrower FWHM can be obtained by adapting the wavelength and incident angle of the light beam. The wavelengths of absorption peaks and the absorptivities can be tuned by controlling the Fermi energy of graphene and the periods of PCs. In addition, the absorber can maintain high absorptivity over a wide incident angle range for both TE and TM polarization. The proposed optical absorber has potential applications in THz biosensors, filters, and switches.

引用

页数：6

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