Scholarlink

<p>Subwavelength polarization gratings, as compact and high-performance polarization-selective devices, enable efficient control of polarization channels to meet the requirements of high-dimensional detection. They are widely applied in fields such as remote sensing, material stress detection, and polarization imaging. Based on the conventional single-layer metallic grating structure, this work designs a one-dimensional double-layer metallic polarization grating with a high extinction ratio and high TM-wave transmittance. The structure is optimized and analyzed using effective medium theory and the finite-difference time-domain method. Simulation results show that, within the long-wave infrared band (8–14&#xa0;μm), the grating achieves TM-wave transmittance ranging from 87% to 98%, with a maximum extinction ratio of 78 dB. Compared with single-layer gratings, the average extinction ratio is improved by approximately 40 dB, significantly enhancing polarization selectivity. Furthermore, the effects of incident angle variation, structural parameter errors, and optical crosstalk between array pixels are analyzed. The presented results provide valuable guidance for the development of metallic wire-grid polarizer arrays with broadband performance, high extinction ratios, and high transmittance.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Design and analysis of a long-wave infrared double-layer subwavelength grating polarizer

  • 期刊论文

  • 发表日期：

    2025年10月15日

查看全文
  • Yusen Zhao,
  • Mingzhao Ouyang,
  • Jinshuang Wu,
  • Yuegang Fu,
  • Wanjiao Zhang

摘要

Subwavelength polarization gratings, as compact and high-performance polarization-selective devices, enable efficient control of polarization channels to meet the requirements of high-dimensional detection. They are widely applied in fields such as remote sensing, material stress detection, and polarization imaging. Based on the conventional single-layer metallic grating structure, this work designs a one-dimensional double-layer metallic polarization grating with a high extinction ratio and high TM-wave transmittance. The structure is optimized and analyzed using effective medium theory and the finite-difference time-domain method. Simulation results show that, within the long-wave infrared band (8–14 μm), the grating achieves TM-wave transmittance ranging from 87% to 98%, with a maximum extinction ratio of 78 dB. Compared with single-layer gratings, the average extinction ratio is improved by approximately 40 dB, significantly enhancing polarization selectivity. Furthermore, the effects of incident angle variation, structural parameter errors, and optical crosstalk between array pixels are analyzed. The presented results provide valuable guidance for the development of metallic wire-grid polarizer arrays with broadband performance, high extinction ratios, and high transmittance.