Single-Layered Microscale PDLC Films for Electro-Optical Modulation of Laser Radiation∗
نویسندگان
چکیده
We report on low-voltage, high-contrast amplitude/phase modulators of laser radiation on the basis of microscale polymer-dispersed liquid crystal (PDLC) single layers providing interference contrast enhancement. The modulators were prepared from liquid crystal (LC) E7 in the solid matrix of UV-cured polymer NOA65. Operating at low voltages, E7/NOA65 single-layered PDLC films of thickness 10–25 μm and mean diameter of LC droplets up to 50 μm are capable of producing a large phase shift up to π/2 for the propagating laser light. This property is very attractive for linear and non-linear optical applications. The precise spatial control of droplet size along the film thickness allows the linear droplet-size gradient single-layered PDLC films to be used for tunable spatial light modulators and other devices for active control of laser radiation. PACS codes: 42.70.Df; 42.79.Kr; 61.30.Gd; 61.30.Pq; 78.66.Qn
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