11 October 2012 A polarization-independent liquid crystal phase modulation using polymer-network liquid crystal with orthogonal alignment layers
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Abstract
A polarization-independent liquid crystal (LC) phase modulation using polymer-network liquid crystals with orthogonal alignments layers (T-PNLC) is demonstrated. T-PNLC consists of three layers. LC directors in the two layers near glass substrates are orthogonal to each other. In the middle layer, LC directors are perpendicular to the glass substrate. The advantages of such T-PNLC include polarizer-free, larger phase shift (~0.4π rad) than the residual phase type (<0.05π rad), and low operating voltage (< 30Vrms). It does not require bias voltage for avoiding scattering because the refractive index of liquid crystals matches that of polymers. The phase shift of T-PNLC is affected by the cell gap and the curing voltages. The potential applications are laser beam steering, spatial light modulators and electrically tunable micro-lens arrays.
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Ming-Syuan Chen, Wei-Chih Lin, Yu-Shih Tsou, Yi-Hsin Lin, "A polarization-independent liquid crystal phase modulation using polymer-network liquid crystal with orthogonal alignment layers", Proc. SPIE 8475, Liquid Crystals XVI, 84750S (11 October 2012); doi: 10.1117/12.930845; https://doi.org/10.1117/12.930845
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