14 October 1998 Switchable circular beamsplitter using a dual-frequency cholesteric liquid crystal
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The cholesteric liquid crystal (LC) has a chiral structure defined by pitch length. This unique structure reflects one handedness of circularly polarized light and is used as a circular polarizer. This polarizer can be actively switched between a state that is transparent to light of all polarizations and another state that in only transmissive to one handedness of circularly polarized light. The dual- frequency material is used to reduce the relaxation time. The dual-frequency circular polarizer can be switched from the transparent homeotropic texture by a low frequency driving signal, and switched to the reflecting planar texture by a high frequency signal. This polarizer functions as a switchable shutter for which we have characterized switching process, relaxation time, polarization purity, and extinction ratio.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Hong Ding, Hong Ding, Greg A. Kopp, Greg A. Kopp, Michael J. Derks, Michael J. Derks, Michael H. Anderson, Michael H. Anderson, Ming Xu, Ming Xu, Deng Ke Yang, Deng Ke Yang, "Switchable circular beamsplitter using a dual-frequency cholesteric liquid crystal", Proc. SPIE 3475, Liquid Crystals II, (14 October 1998); doi: 10.1117/12.326904; https://doi.org/10.1117/12.326904

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