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- Title
Broad-Tuning, Dichroic Metagrating Fabry-Perot Filter Based on Liquid Crystal for Spectral Imaging.
- Authors
Tingbiao Guo; Zijian Lin; Xinan Xu; Zhi Zhang; Xiao Chen; Nan He; Guoqing Wang; Yi Jin; Julian Evans; Sailing He
- Abstract
Dynamic structural color can empower devices with additional functions like spectrum and polarization detection beyond display or imaging. However, present methods suffer from narrow tuning ranges, low throughput, or bulky volumes. In this work, a tunable filter composed of a dichroic metagrating Fabry-Perot cavity and liquid crystal (LC) material is proposed and investigated. By modulating the polarization of the incident light with the LC, the color response can change from blue to green and deep red due to the ‘mode jumping’ effect, with a tuning range of around 300 nm. Besides, we experimentally demonstrate the use of this device as a spectral imager in the visible range. Experimental results show that spectral resolvability can be around 10 nm, with the largest peak wavelength inaccuracy of ∼ 5 nm. This approach shows superior performance over traditional liquid crystal tunable filters in low light conditions and indicates the potential of dynamic structural color for miniaturized spectroscopic applications.
- Subjects
LIQUID crystals; STRUCTURAL colors; OPTICAL polarization; LIGHT filters; DICHROIC filters; SPECTRAL imaging
- Publication
Progress in Electromagnetics Research, 2023, Vol 177, p43
- ISSN
1070-4698
- Publication type
Article
- DOI
10.2528/pier23030703