Abstract
An extension to coupled wave theory suitable for all regimes of diffraction is presented. The model assumes that the refractive index grating has an arbitrary profile in one direction and is periodic (but not necessarily sinusoidal) in the other. Higher order diffracted terms are considered and appropriate mismatch terms dealt with. It is shown that this model is analytically equivalent to both the Bragg and Raman–Nath regime coupling models under an appropriate set of assumptions. This model is applied to cases such as optical coupling in liquid crystal cells with photoconductive layers. Its predictions are successfully compared to finite element simulations of the full Maxwell’s equations.
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Daly, K.R., D’Alessandro, G. & Kaczmarek, M. Regime independent coupled-wave equations in anisotropic photorefractive media. Appl. Phys. B 95, 589–596 (2009). https://doi.org/10.1007/s00340-009-3492-1
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DOI: https://doi.org/10.1007/s00340-009-3492-1