Analog Optical Phase Modulator Based on Chiral Smectic and Polymer Cholesteric Liquid Crystals
Published by Optical Society of America Optics Letters Vol. 20, Issue 23, pp. 2441-2443 (1995) https://doi.org/10.1364/OL.20.002441
A high-speed analog optical phase modulator based on chiral smectic and cholesteric liquid crystals is discussed. The chiral smectic liquid-crystal device functions as a variable-orientation half-wave retarder, whereas the polymer cholesteric liquid-crystal film acts as a polarization-preserving mirror. We use circular Jones calculus to describe optical phase modulation, using a half-wave retarder of variable orientation acting on circularly polarized light. The phase induced by this modulator is achromatic. Analog phase modulation of nearly 360° is demonstrated with a device switching time of 200 μs at 25 °C.