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54.2: Invited Paper: Liquid Crystal Based Optical Processing

Wavefront control is the fundamental for various optical elements. Spatial light modulator (SLM), most of which consists of numerous discrete electrically driven micro-size liquid crystal (LC) pixels, could modulate the phase of light dynamically and has attracted intensive attentions. However, the complex electrode matrix makes the SLM costly, optical inefficient, and limiting the quality of output beams. Here, I present an optically addressed LC SLM based on the combination of a rewritable photoalignment agent and a dynamic polarization photo exposing system [1]. This technique enables the accurate, arbitrary and reconfigurable azimuthal angle control of LCs, thus supplies a powerful approach for the manipulation of light. By this means, the tailoring of arbitrary fine microstructures with binary or continuously space-variant liquid crystal azimuthal orientations are demonstrated. Several specially designed patterns and corresponding specific optical fields will be briefly reviewed. High quality vortex beams [2-9], vector beams [10,11] and Airy beams [12,13] which exhibit fantastic properties and have diverse applications are generated with unprecedented flexibility in the design and control of light wavefront. Besides high efficiency, good electrical switchability and broad wavelength tolerance, the proposed devices also exhibit merits of compact size, low cost, dynamic mode conversion, polarization controllable energy distribution and available for short pulse and intense light modulation. This work may pave a bright way towards beam shaping and bring new possibilities for the design of novel advanced liquid crystal photonic devices [14].