Design Optimization and Fabrication of Infrared Broad-Band Long-Wavelength Pass Filter

Citation

叶自煜 (Ye Ziyu), 张佰森 (Zhang Baisen), 朱忠奎 (Zhu Zhongkui). 一种长波红外宽光谱长波通滤光片的设计与镀制 (Design Optimization and Fabrication of Infrared Broad-Band Long-Wavelength Pass Filter) [J]. Based on the DOI 10.3969/j.issn.1672-7126.2012.09.14, the publication likely occurred in 2012, possibly in the 9th issue of the journal.

Keywords

  • 长波红外 / Long-wavelength infrare
  • 宽光谱 / Broad-band/Wide spectrum
  • 长波通滤光片 / Long-wavelength pass filter
  • 遥感 / Remote sensing
  • 自然资源 / Natural resources
  • 环境 / Environment
  • 膜厚优化 / Film thickness optimization
  • 等效折射率法 / Equivalent-index method
  • 透射带波纹 / Transmittance band ripple
  • 高透射率 / High transmittance
  • 平均透射比 / Average transmission ratio
  • 最低透射比 / Minimum transmission ratio
  • 截止带 / Rejection band
  • 设计优化 / Design optimization
  • 膜厚监控 / Monitoring the film thickness
  • 膜生长 / Film growth
  • 光谱调整 / Spectral adjustment
  • 周期性对称膜系 / Periodic symmetric film system
  • 部分膜层优化方法 / Partial film layer optimization method
  • 高透射波段 / High transmission band
  • 截止波段 / Cutoff band
  • 膜层结构 / Film layer structure
  • 红外相机 / Infrared camera

Brief

This article details the design optimization and fabrication of a novel broad-band long-wavelength infrared pass filter for remote sensing, achieving a flat ripple and high transmittance in the passband and low transmittance in the rejection band through partial film layer optimization and plasma-assisted deposition.

Summary

This article presents the design, optimization, and fabrication of a broad-band long-wavelength infrared pass filter for remote sensing applications. The researchers used the equivalent-index method to optimize film thickness and reduce transmittance ripple. Their design, based on a periodic symmetric film system and employing a partial film layer optimization method, achieved high average transmittance (>90%) and low transmittance (<1%) in the passband and rejection band, respectively. The fabrication process utilized a converging beam infrared optical system for accurate film thickness monitoring and plasma-assisted deposition (PAD) to enhance film adhesion and environmental stability. The resulting filter demonstrated satisfactory spectral performance.

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