Design and fabrication of an integrated dual-channel thin-film filter for the mid-infrared

Shun Zhou*, Liyu Zhang, Feng Guo, Chunfang Wu, Junqi Xu, Kaifeng Zhang*, Kun Li, Zheng Liu, Xiangguo Xiao, Shigeng Song*, Weiguo Liu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Micro-filters fabricated using integration methods is now the trend for multichannel filters in imaging spectrum systems. Traditional multichannel bandpass filters are mainly fabricated separately by multilayered thin films and then glued together. This approach involves the complexity of precision cutting, dicing, and adhesive bonding; therefore, the possibility of miniaturization is quite limited. In this work, a dual channel bandpass thin film filter for the mid-infrared was fabricated by using the lift-off process. The structure of a 4-cavity Fabray–Perot (F-P) type filter was designed and optimized. The bandpass filter over the range 3.55–3.75 µm with full width at half maximum (FWHM) of 274 nm and the bandpass filter over the range 4.85–4.95 µm with FWHM of 246 nm were obtained with a 4.5 µm joint width. The average transmittance of the filters is more than 83.5% and optical density value of the cutoff is 3. The thickness of 3.55–3.75 µm bandpass filter was measured and the thickness error was analyzed. The results show that the thickness error, especially the thickness error of spacer layers, induces the degradations of peak transmission and bandwidth. This kind of mid-infrared filter has important application in space remote sensing, military, and civil fields.

Original languageEnglish
Article number803
Number of pages13
JournalCoatings
Volume11
Issue number7
DOIs
Publication statusPublished - 2 Jul 2021

Keywords

  • dual-channel band pass filter
  • Fabray–Perot structure
  • lift-off process
  • optical thin film

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