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<p>In theory, periodic antireflective microstructured surfaces possess broadband and wide-angle antireflective capabilities. However, their unique functionality is limited by the diffraction effects of the periodic structures in practical fabrication, making it challenging to achieve broadband and wide-angle antireflective performance under low aspect ratio conditions. In this paper, a double-layer periodic microstructure is designed in the near infrared and mid-infrared composite spectrum, which realizes the suppression of higher-order diffraction in the short wavelengths that the subwavelength condition is not met. In the near infrared spectrum (1–1.6&#xa0;μm) (0–30°), the average transmittance of the double-layer microstructure is 96.42%. The average transmittance of the double-layer microstructure is 96.54% at wide angle (0–75°) incidence in mid-infrared spectrum (3–5&#xa0;μm), and the low depth-to-width ratio makes this structure easier to prepare. This study aims to optimize optics and imaging systems with a new solution, further advancing the application of micro-nano structures in the field of optical technology.</p>

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Research on the double-layer antireflection microstructure in composite spectral bands with diffraction suppression

  • 期刊论文

  • 发表日期：

    2025年6月17日

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  • Shanshan Kou,
  • Mingzhao Ouyang,
  • Litong Dong,
  • Jinshuang Wu,
  • Yuegang Fu,
  • Jiaxin Li

摘要

In theory, periodic antireflective microstructured surfaces possess broadband and wide-angle antireflective capabilities. However, their unique functionality is limited by the diffraction effects of the periodic structures in practical fabrication, making it challenging to achieve broadband and wide-angle antireflective performance under low aspect ratio conditions. In this paper, a double-layer periodic microstructure is designed in the near infrared and mid-infrared composite spectrum, which realizes the suppression of higher-order diffraction in the short wavelengths that the subwavelength condition is not met. In the near infrared spectrum (1–1.6 μm) (0–30°), the average transmittance of the double-layer microstructure is 96.42%. The average transmittance of the double-layer microstructure is 96.54% at wide angle (0–75°) incidence in mid-infrared spectrum (3–5 μm), and the low depth-to-width ratio makes this structure easier to prepare. This study aims to optimize optics and imaging systems with a new solution, further advancing the application of micro-nano structures in the field of optical technology.