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The one-way rotating state is realized in circular photonic crystal (CPC) with yttrium-iron-garnet rods. Adopting 5 ring rods, eight one-way rotating mode frequency bands with periodic distribution and their corresponding eight one-way rotating resonant modes are found within a specific frequency range and their distribution laws are obtained. Adopting 2–6 ring rods, the best bandwidth and localization for the one-way rotating state are realized, respectively, when adopting 4 and 6 ring rods. The research results will provide reference for the designs of the new one-way rotating state devices based on CPC.
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Hou et al. (2019) studied this question.
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