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Radiation modes are the building blocks for an exact analysis of radiation. We provide a simple ‘scalar’ determination of these vector modes valid on arbitrary waveguides, when the maximum core refractive index nco is slightly greater than that of the cladding ncl. The nco≈ncl radiation modes have not been previously reported for any optical waveguide. They simplify the description of radiation as the nco≈ncl bound modes do for guided power.
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Snyder et al. (1979) studied this question.
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