Open AccessTransmission and reflection bi-direction terahertz encoding metasurface with a single structure
Author(s) -
Jiusheng Li,
Lijing Yang
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.439609
Subject(s) - terahertz radiation , optics , materials science , scattering , beam steering , optoelectronics , beam (structure) , physics
Most reported metasurfaces operate in single propagation direction mode (either transmissive mode or reflective mode), which hamper practical application. Here, we proposed a bi-directional operation coding metasurface based on a phase change material of a vanadium dioxide (VO 2 ) assisted metasurface. It can realize a dynamically invertible switch between the transmissive mode or reflective mode in the terahertz regime by changing the external ambient temperature. The proposed structure consists of a silicon column, polyimide dielectric substrate layer, and VO 2 film bottom layer. When VO 2 is in dielectric state, the designed metasurface possesses the functions of transmission beam splitting and deflection and generates a transmission vortex beam. When VO 2 is in metallic state, the proposed metasurface exhibits many functions such as reflection beam splitting, deflection, radar scattering surface (RCS) reduction and reflection vortex beam generation. The proposed metasurface can solve transmissive and reflective bi-direction terahertz encoding regulation. This scheme provides a new method to realize multi-function terahertz devices.