Abstract
We study the transmission behavior of photonic topological mode through topological microwave channels with different shapes in a two-dimensional photonic crystal platform by the COMSOL Multiphysics software. A four-source-array is set to excite the topological modes. We find that topological modes with up and down pseudospin both can be excited in one channel although they have different intensity. Different channel can provide different transmission ratio between two opposite directions (rightward and leftward). These results suggest the topological mode might undergo a spin-flip process at the exit end face or the sharp bending position of the topological channel.
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