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Title: A high-resolution micro-circular-polarization-analyzer array for real-time active circular polarization imaging
Authors: Zhao, Xiaojin
Bermak, Amine
Boussaid, Farid
Yao, Lishuang
Chigrinov, Vladimir G.
Keywords: CMOS image sensors
Biomedical optical imaging
Light polarization
Liquid crystals
Issue Date: Nov-2009
Citation: Proceedings 2009 IEEE Biomedical Circuits and Systems Conference, BioCAS 2009, 26-28 November 2009, Beijing, China, p. 49-52.
Abstract: In this paper, a high-resolution micro-circularpolarization-analyzer (MCPA) array is presented and characterized. MCPAs for extracting right-handed and left-handed circularly polarized components of incident light are implemented by fabricating polymerizable-liquid-crystal (PLC) microretarders with perpendicular fast axes on top of a 45⁰ laminated linear polarizing film. With sulfonic-dye-1 (SD1) as the PLC photoalignment material, an MCPA feature size as small as 5μm is achieved. In addition, the concept of real-time active circular polarization image sensing and processing with targets illuminated by collimated circularly polarized light is enabled by the MCPA array’s on-chip integration with complementary metal-oxide-semiconductor (CMOS) image sensors.
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