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Fast polarisation-insensitive optical shutter supported by backflow in dichroic dye-doped dual-frequency liquid crystal |
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| Authors: | Glenn Mangelinckx Jeroen Beeckman Olga Chojnowska Jungsoon Shin James DK Kim Roman D?browski |
| Institution: | 1. Department of Electronics and Information Systems, Ghent University, Ghent, Belgiumglenn.mangelinckx@elis.ugent.be;3. Department of Electronics and Information Systems, Ghent University, Ghent, Belgium;4. Institute of Chemistry, Military University of Technology, Warsaw, Poland;5. Samsung Advanced Institute of Technology, Yongin-si, Korea |
| Abstract: | This paper describes a novel implementation of a dual-frequency liquid crystal optical shutter of the guest–host type. The transmissive state of the filter is obtained by applying a low-frequency electric field that brings the dichroic dye in a homeotropic orientation. The light-absorbing state is realised by a twisted planar configuration for which the absorption is quasi-independent of the polarisation. Switching between the two states occurs in about 1 ms and the devices show no scattering for wavelengths inside or outside the absorption band of the dichroic dye. Simulations and experiments reveal how a twisted state is obtained through the backflow phenomenon. |
| Keywords: | dual-frequency mixture backflow dichroic dye optical transmission modulator fast response time |