Abstract

Recently, terahertz (THz) nonreciprocal and functionality-switchable devices have drawn much attention. Here we report a magnetic-free THz unidirectional perfect absorber as well as a functionality-switchable device between the band-pass filter and perfect absorber based on dielectric-graphene multilayers containing a VO₂ defect layer. We provide a theoretical explanation for the nonreciprocal transmission properties. The working frequencies of these devices can be tailored by using graphene layers of different chemical potentials.

© 2022 Optica Publishing Group

Graphene-VO_2-based-defect-induced tunable multiple narrowband unidirectional photonic terahertz absorber

Safayat-Al Imam, Khandakar Mohammad Ishtiak, and Quazi D. M. Khosru
Opt. Mater. Express 12(7) 2653-2667 (2022)

Tunable and multifunctional terahertz devices based on one-dimensional anisotropic photonic crystals containing graphene and phase-change material

Xiangfei Gao, Zebin Zhu, Jing Yuan, and Liyong Jiang
Opt. Express 29(9) 13314-13330 (2021)

Function switchable broadband wave plate based on the Au–VO₂ hybrid metasurface

Lijun Guo, Kun Zhang, Xingrun Zhang, Bingyu Chen, and Weijin Kong
Opt. Lett. 47(18) 4818-4821 (2022)

Active terahertz beam deflection and nonreciprocal spin chirality selection based on magneto-optical P-B metasurface with stacked-graphene layers

Dan Zhao, Zhiyu Tan, Huijun Zhao, Fei Fan, and Shengjiang Chang
Opt. Lett. 47(4) 818-821 (2022)

Dynamically tunable broadband absorber/reflector based on graphene and VO₂ metamaterials

Xinyi Wang, Chi Ma, Lihua Xiao, Xia Li, Jiabin Yu, and Binggang Xiao
Appl. Opt. 61(7) 1646-1651 (2022)