Journal of Applied Optics, Volume. 46, Issue 1, 186(2025)

Design of mid-wave infrared metal wire-grid polarizer with sub-wavelength single-layer antireflection film

Peiyao WANG1,2、*, Huangeng LIU1,2, and Liyong REN1,2
Author Affiliations
  • 1School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710119, China
  • 2Key Laboratory of Optical Information Regulation and Enhancement Technology, Xi'an 710119, China
  • show less

    A Si-based gold (Au) wire-grid polarizer was designed for the 3 μm~5 μm mid-wave infrared (MWIR) wavelength range. The introduction of an MgF2 dielectric layer between the Au grid and the Si substrate was proposed to improve the transmittance of transverse magnetic (TM) waves and the extinction ratio (ER) of the wire-grid polarizer. The structural parameters of the Au grid on the Si substrate were optimized using COMSOL simulation software. The results show that the average transmittance of TM waves is 93%, and the average polarized ER is 39.3 dB. In addition, a method of using tungsten (W) as a new metal material to improve the polarization performance of the wire-grid polarizer was proposed. The simulation results show that the average transmittance of TM waves is 92.7%, and the average polarized ER is 64.4 dB. However, the W has higher hardness and higher requirements on the etching process. It is expected to make superior MWIR wire-grid polarizers through advances in process and technologies.

    Keywords
    Tools

    Get Citation

    Copy Citation Text

    Peiyao WANG, Huangeng LIU, Liyong REN. Design of mid-wave infrared metal wire-grid polarizer with sub-wavelength single-layer antireflection film[J]. Journal of Applied Optics, 2025, 46(1): 186

    Download Citation

    EndNote(RIS)BibTexPlain Text
    Save article for my favorites
    Paper Information

    Category:

    Received: Nov. 20, 2023

    Accepted: --

    Published Online: Apr. 1, 2025

    The Author Email: Peiyao WANG (wpy20002266@163.com)

    DOI:10.5768/JAO202546.0105004

    Topics