Abstract
The polarization properties of a one-dimensional, 1x4096 pixels, zero-twist nematic liquid crystal (NLC) spatial light modulator (SLM) were investigated. The fringing electric field between pixels can introduce twist deformations in addition to the wanted splay and bend. The twist will affect the polarization and couple energy between polarization modes. The electric fields and director distribution in the LC were numerically determined by solving a set of coupled partial differential equations. The optical propagation in the resulting inhomogeneous anisotropic crystal was performed by the finite-difference time-domain (FDTD) method. The simulated results were validated by comparison with experimental diffraction patterns. As the numerical scheme is slow a simple semi-empirical model was also developed. Using parameters from the simulated results the model was adjusted to allow rapid calculations of the polarization distribution of the light modulated by the SLM.
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