Triple-Band Terahertz Chiral Metasurface for Spin-Selective Absorption and Reflection Phase Manipulation

Author:

Zhang Hang,Si LimingORCID,Ma Tianyu,Dong Lin,Niu Rong,Bao XiueORCID,Sun HoujunORCID,Ding Jun

Abstract

In this paper, a triple-band terahertz chiral metasurface is proposed, which could realize spin-selective absorption (SSA) effect and efficient independent phase manipulation in three distinct frequency bands. Through the simulation of the surface current distribution, we explain the mechanism of the triple-band SSA effect. Furthermore, the introduction of Pancharatnam–Berry phase endows the metasurface with the ability to manipulate the reflection phase at the chiral resonance frequencies, which enabled simultaneous amplitude and phase manipulation of CP waves through different phase coding strategies. To test this concept, two terahertz SSA-coding metasurfaces were designed and simulated, which have the function of four-beam splitting and vortex wave anomalous reflection, respectively. These simple-structured multifunctional devices demonstrate the application prospects of the metasurface in terahertz chiral sensing, imaging, secure communications, etc.

Funder

National Key R&D Program of China

National Natural Science Foundation of China

Beijing Natural Science Foundation of China-Haidian Original Innovation Joint Fund

Beijing Natural Science Foundation

Publisher

MDPI AG

Subject

Electrical and Electronic Engineering,Computer Networks and Communications,Hardware and Architecture,Signal Processing,Control and Systems Engineering

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