Tunable diffraction grating using ultraviolet-light-induced spatial phase modulation in dual-frequency liquid crystal
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A phase grating phenomena, based on the spatial dielectric modulation of the dual-frequency liquid crystal (DFLC) was presented. To fabricate the grating, a photomask with transparent and opaque stripes was used. It was found that in the ultraviolet (UV) exposed stripes, the negative dielectric anisotropy tolane compound of the DFLC mixture was partially polymerized, resulting in a decreased threshold voltage as compared to that of the unexposed region. It was also found that due to the dual frequency addressing at 30 V rms, the response time of the DFLC phase grating was 1 ms at room temperature.
author list (cited authors)
Lin, P., Liang, X., Ren, H., & Wu, S.