The problem of in-plane scattering in a planar optical waveguide has been analyzed by means of a Green's function technique. The main result is applicable to scattering caused by either surface roughness or refractive-index fluctuations. As a specific example, the theory is applied to the case of surface roughness to calculate the scattered power collected by an off-axis detector.
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Modavis et al. (1984) studied this question.
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