Terahertz Polarizer with High Extinction Ratio and High Transmittance Based on Bilayer Metal Grating

JI Yun-yun; FAN Fei; CHENG Jie-rong; WANG Xiang-hui; CHANG Sheng-jiang

doi:10.12263/DZXB.20230045

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Terahertz Polarizer with High Extinction Ratio and High Transmittance Based on Bilayer Metal Grating

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

- Terahertz Polarizer with High Extinction Ratio and High Transmittance Based on Bilayer Metal Grating
- ACTA ELECTRONICA SINICA Vol. 51, Issue 10, Pages: 2733-2738(2023)
- 作者机构：
  
  1.南开大学现代光学研究所,天津 300350
  2.天津光电子传感器与传感网络技术重点实验室,天津 300350
  3.天津微尺度光学信息技术科学重点实验室,天津 300350
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China(61830112;61971242;62205160);Fundamental Research Funds for the Central Universities(63231159);National Key Research and Development Program of China(2017YFA0701000)
- DOI：10.12263/DZXB.20230045
  CLC： O436.3;TN91
- Received：13 January 2023，
  
  Revised：2023-10-10，
  
  Published：25 October 2023
- 稿件说明：
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冀允允,范飞,程洁嵘等.基于双层金属光栅的高消光比高透过率太赫兹偏振器[J].电子学报,2023,51(10):2733-2738.

JI Yun-yun,FAN Fei,CHENG Jie-rong,et al.Terahertz Polarizer with High Extinction Ratio and High Transmittance Based on Bilayer Metal Grating[J].ACTA ELECTRONICA SINICA,2023,51(10):2733-2738.
冀允允,范飞,程洁嵘等.基于双层金属光栅的高消光比高透过率太赫兹偏振器[J].电子学报,2023,51(10):2733-2738. DOI： 10.12263/DZXB.20230045.

JI Yun-yun,FAN Fei,CHENG Jie-rong,et al.Terahertz Polarizer with High Extinction Ratio and High Transmittance Based on Bilayer Metal Grating[J].ACTA ELECTRONICA SINICA,2023,51(10):2733-2738. DOI： 10.12263/DZXB.20230045.

摘要

本文设计了一种基于双层金属亚波长光栅的太赫兹偏振器，其可以实现高透过率和良好消光比的特性.该偏振器是通过微加工技术在薄石英衬底的上下表面上制备而成的.实验和模拟结果均表明，双层金属光栅具有与单层金属光栅相近的透过率、更高的偏振度和更高的消光比.在0.3~2.0 THz的频率范围内，测量的透过率在83.4%到62.7%之间，偏振度大于99.7%，消光比大于29 dB.此外，设计的两种双层金属光栅偏振器件成功地应用于太赫兹时域光谱（TeraHertz Time Domain Spectroscopy，THz-TDS）系统中，获得了超过96.2%的偏振度和超过17.1 dB的消光比.通过调整金属亚波长光栅的参数（例如间距、线宽和金属膜厚度），可以进一步提高透过率、偏振度和消光比等特性.

Abstract

A terahertz polarizer based on bilayer metal subwavelength-grating is designed to achieve high transmission and good extinction ratio. The polarizer is fabricated on the upper and lower surfaces of thin quartz substrate by micro-fabrication technique. Both experimental and simulation results show that the bilayer metal grating has similar transmittance

higher degree of polarization and extinction ratio than the single-layer metal grating. Measured transmittance is between 83.4% and 62.7% in the frequency range of 0.3~2.0 THz

and the degree of polarization and extinction ratio is more than 99.7% and more than 29 dB

respectively. In addition

the two designed bilayer metal gratings are successfully used in the terahertz time-domain spectroscopy (THz-TDS) system

and the degree of polarization of more than 96.2% and the extinction ratio of more than 17.1 dB are obtained. The transmittance

degree of polarization and extinction ratio can be improved by further tuning the parameters (such as the pitch

line width

and metal film thickness) of the metal subwavelength-grating.

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references

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