A theory is developed which calculates the positions of unbound mode index dark lines in planar waveguide systems, by means of evaluating the surface reflectivity at the coupling prism. This method is shown to explain some extra observed dark mode lines which are not predicted by other theories. Values calculated for typical ion-implanted waveguide profiles are compared favourably with those obtained from other approximations.
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Chandler et al. (1986) studied this question.
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