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5 January 2004 Polarization effects in nematic liquid crystal optical phased arrays
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In a one-dimensional liquid crystal optical phased array (LCOPA), a liquid crystal layer is electrically addressed by an array of long, narrow electrodes. A spatially periodic voltage profile can be applied to the liquid crystals in order to induce a sawtooth-shaped index of refraction variation in the liquid crystal layer that will steer an optical beam in a fashion analogous to that of a blazed diffraction grating. In reality, an LCOPA is a thick, periodic, anisotropic structure with complicated polarization properties. The changes in polarization as a beam passes through an LCOPA can have negative practical effects, particularly in optical systems where LCOPAs and other polarization-sensitive optical elements are cascaded. This paper presents experimental measurements of the polarization state of the light diffracted by an LCOPA as well as a discussion of the origin of these effects.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Scott R. Harris "Polarization effects in nematic liquid crystal optical phased arrays", Proc. SPIE 5213, Liquid Crystals VII, (5 January 2004);

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