Liquid Crystal Optical Phase Plate with a Variable In-Plane Gradient
نویسندگان
چکیده
We propose a nematic liquid crystal ͑LC͒ optical phase plate, with a large continuous in-plane gradient that is variable, and its application to a beam steering device with high efficiency. The device is a vertically aligned, continuous phase, optical phased array ͑V-COPA͒ that uses a negative dielectric anisotropy LC material. High steering efficiency of over 95% is demonstrated by modeling the LC director field and its effect on transmitted light. The period of the V-COPA grating can be varied by adjusting an applied voltage profile, which allows for continuous angular control of the diffraction angle.
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