A High Throughput Tunable Filter Module for Multispectral Imaging

• DOI: 10.1002/adom.202302009
• Publication Date: 2024-01-03T05:19:26Z
• Authors: Xiao Chen; Tingbiao Guo; Zijian Lin; Xinan Xu; Zhi Zhang; Nan Wang; Sailing He
• Keywords: Dichroic glass; Dichroic filter

Abstract Tunable filters are vital not only for dynamic display but also in the miniaturized spectral imaging system. Yet, present tunable devices possess low optical throughput, bulky volume, slow response, or complex configuration. In this paper, study proposed and experimentally demonstrated a compact filter module based on metagratings combined with liquid crystals (LC). By synergetic effect between birefringent LC dichroic metagratings, possesses distinct transmissive features by electrically tuning material, resulting from polarization interference effect. A simple nanoimprinting method, which is suitable mass production of nanostructures adopted low‐cost fabrication. These unique endow cost, high volume. As proof concept, multispectral imager built commercial microscope. Experimental results show system response five times higher throughput across whole visible region than traditional crystal signal‐to‐noise ratio can be improved 7 dB. Considering feasibility nanoimprinting, paves way low‐light conditions on‐site scenarios such as tongue diagnosis food quality inspection.