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The single mode condition of rectangular waveguides is derived by using a simple ray-optics approach, which relies on geometrical ray tracing principles as in classical optics.Light propagation through such a waveguide can be approximately simplified as reflections within two planes of incidence.By employing the mode equations for different polarizations, a relation that shows the singlemode cut-off as a function of the waveguide dimensions is readily obtained.
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Song et al. (2013) studied this question.
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