We report a wave-optical analysis of light propagation along leaky waveguides using a symmetric hollow dielectric slab as a model. The field deformation due to leakage into the surrounding regions for a guided wave that penetrated into the hollow structure is studied by using the eigenmode expansion method, where the propagation is described by an integral over the modes of the continuum. The numerical evaluation of the integral expansion enables us to estimate the radiation loss for the incident wave. Results are compared with those based on the simplified zigzag ray-optics approach and complex leaky waves.
© 1980 Optical Society of America
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