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The effect of a substrate's nonreciprocity on the surface modes of a grounded chiroslab guide is investigated. It is shown that, for any surface mode, a bound on the magnitude of the nonreciprocity parameter exists, beyond which the mode is at cutoff. Furthermore, in the nonreciprocal achiral limit, the slab guide can only support TE modes—whereas in the reciprocal achiral limit both TE and TM modes can propagate.
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Paiva et al. (1993) studied this question.
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