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Title: Liquid-crystal micropolarimeter array for visible linear and circular polarization imaging
Authors: Zhao, Xiaojin
Bermak, Amine
Boussaid, Farid
Chigrinov, Vladimir G.
Keywords: Liquid crystals
Image sensors
Light polarization
Issue Date: May-2010
Citation: Proceedings of 2010 IEEE International Symposium on Circuits and Systems, ISCAS 2010, 30 May-2 June 2010, Paris, France, p. 637-640.
Abstract: In this paper, we propose a liquid-crystal micropolarimeter (LCMP) array with high spatial resolution for real-time linear and circular polarization imaging in visible spectrum. LCMPs for extracting 0°, 90° linearly and righthanded circularly polarized components of incident light are implemented by micro-patterning a liquid crystal (LC) layer on top of a 45° oriented ultra-thin metal-wire-grid polarizer (MWGP). A compact LCMP pitch of 5μm×5μm is achieved with sulfonic-dye-1 (SD1) as the LC alignment material. In addition, these micron-scale LCMPs feature ∼ 5μm overall thickness and ∼1100 extinction ratio. Reported experimental results validate the concept of real-time linear and circular polarization image sensing and processing with targets illuminated by collimated artificial light.
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