Dual-Band Terahertz Chiral Metasurface with Circularly Polarized Absorbing and Anomalous Reflecting

ZHANG Hang; DONG Lin; TANG Peng-cheng; ZHANG Qing-le; SUN Hou-jun; SI Li-ming

doi:10.12263/DZXB.20221118

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Dual-Band Terahertz Chiral Metasurface with Circularly Polarized Absorbing and Anomalous Reflecting

THz metasuface technology and application | 更新时间：2025-12-08

- Dual-Band Terahertz Chiral Metasurface with Circularly Polarized Absorbing and Anomalous Reflecting
- ACTA ELECTRONICA SINICA Vol. 51, Issue 10, Pages: 2690-2699(2023)
- 作者机构：
  
  1.北京理工大学集成电路与电子学院,北京 100081
  2.毫米波与太赫兹技术北京市重点实验室,北京 100081
  3.北京理工大学长三角研究院,浙江嘉兴 314019
  4.香港城市大学太赫兹及毫米波国家重点实验室,香港 999077
- 作者简介：
- 基金信息：
  
  National Key Research and Development Program of China(2022YFF0604801);National Natural Science Foundation of China(62271056;61527805);Beijing Natural Science Foundation of China(L222042)
- DOI：10.12263/DZXB.20221118
  CLC： TN8;
- Received：09 October 2022，
  
  Revised：2023-01-15，
  
  Published：25 October 2023
- 稿件说明：
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张航,董琳,汤鹏程等.双频太赫兹圆极化吸波与异常反射手性超表面[J].电子学报,2023,51(10):2690-2699.

ZHANG Hang,DONG Lin,TANG Peng-cheng,et al.Dual-Band Terahertz Chiral Metasurface with Circularly Polarized Absorbing and Anomalous Reflecting[J].ACTA ELECTRONICA SINICA,2023,51(10):2690-2699.
张航,董琳,汤鹏程等.双频太赫兹圆极化吸波与异常反射手性超表面[J].电子学报,2023,51(10):2690-2699. DOI： 10.12263/DZXB.20221118.

ZHANG Hang,DONG Lin,TANG Peng-cheng,et al.Dual-Band Terahertz Chiral Metasurface with Circularly Polarized Absorbing and Anomalous Reflecting[J].ACTA ELECTRONICA SINICA,2023,51(10):2690-2699. DOI： 10.12263/DZXB.20221118.

摘要

本文提出了一种工作在太赫兹频段的双频圆极化手性吸波和异常反射手性超表面，通过合理组合两种手性结构，实现在两个频段相互独立的圆极化手性吸收和异常角度的圆极化转换功能.该双频太赫兹手性超表面在2.53 THz处对左旋圆极化波的吸收率为96.3%，对右旋圆极化波实现同极化的反射；在3.43 THz处对右旋圆极化波的吸收率为90.9%，而对左旋圆极化波表现为同极化反射功能.本文进一步通过连续旋转单元图案引入几何相位，实现了2π反射相位全覆盖.组阵后的手性超表面在两个工作频点各自吸收特定旋向的圆极化波，而对正交极化的圆极化波分别发生约±20°的保手性异常反射.这种基于手性超表面的双频太赫兹多功能器件有望应用于电磁能量收集、极化转换器、手性传感等领域.

Abstract

Based on the theory of Jones matrix and the principle of Pancharatnam-Berry phase

a dual-band terahertz circularly-polarized (CP) absorbing and anomalous reflecting chiral metasurface is proposed in this paper. The CP chiral absorption and conversion function with anomalous reflection angles are realized independently in the two frequency bands. The metasurface unit consists of a combination of two chiral structures

which has an absorption rate of 96.3% for the incident left-hand circularly polarized (LHCP) waves

and realizes co-polarized reflection for the incident right-handed circularly polarized (RHCP) waves at a low frequency of 2.53 THz; meanwhile

the co-polarized reflection will be achieved for the LHCP waves at a high frequency of 3.43 THz

and the absorption rate of the RHCP waves is 90.9%. According to the principle of Pancharatnam-Berry phase

the full coverage of the 360° reflection phase can be realized by rotating the chiral metasurface unit. This chiral metasurface array can absorb the incident CP waves with specific handedness at two operating frequencies (low frequency 2.53 THz and high frequency 3.43 THz)

and generate the handedness-preserving anomalous reflections with -26° and +19° angles for the corresponding orthogonal CP waves

respectively. This terahertz multi-function beam control device based on the chiral metasurface has numerous potential in electromagnetic energy harvesting

polarization converters

chiral sensing

radar and other fields.

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references

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