A normal-mode anisotropic liquid-crystal (LC) gel is demonstrated. In the absence of an electric field, the light polarized along the rubbing direction is scattered. In the voltage-on state, the gel is highly transparent and is independent of polarization. Such a normal mode LC gel exhibits a modest contrast ratio, response time, and low operating voltage. It can be used as a broadband switchable polarizer, variable optical attenuator, and reflective display.
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Fan et al. (2003) studied this question.
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