High-speed tunable multi-bandpass filter for real-time spectral imaging using blue phase liquid crystal etalon

Research output: Contribution to journalArticlepeer-review

Abstract

We developed a high-speed, electrically tunable multi-bandpass filter using a polymer-stabilized blue-phase liquid crystal etalon and a narrowband multi-bandpass interference filter, for use in real-time multi-spectral imaging systems. We show theoretically that the filter exhibits high-level transmittance (≥ 80%) by using an Ag film as the reflective film used in the etalon. We confirmed that the filter allows for high-speed switching of the transmitted wavelength; the response time is about 1 ms. The filter enables high-transmittance, high-speed spectroscopy. Therefore, high-sensitivity real-time multi-spectral imaging at a frame rate of 60 fps or more can be expected in the future.

Original languageEnglish
Pages (from-to)202-209
Number of pages8
JournalITE Transactions on Media Technology and Applications
Volume8
Issue number4
DOIs
Publication statusPublished - 2020

Keywords

  • Blue phase liquid crystal
  • Fabry-pérot etalon
  • Fast switching
  • High-transmittance
  • Liquid crystal tunable filter
  • Multi-spectral imaging

ASJC Scopus subject areas

  • Signal Processing
  • Media Technology
  • Computer Graphics and Computer-Aided Design

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