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Liquid crystal optical phase plate with a variable in-plane gradient

2008; American Institute of Physics; Volume: 104; Issue: 3 Linguagem: Inglês

10.1063/1.2966300

1520-8850

Lei Shi, Paul McManamon, Philip J. Bos,

Photonic and Optical Devices

We propose a nematic liquid crystal (LC) 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-COPA) 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.