Design of terahertz reconfigurable devices by locally controlling topological phases of square gyro-electric rod arrays

Abstract

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Tunable Second‐Order Topological States in Rhombic Photonic Crystals

“…Spin [ 43,44 ] and valley degrees of freedom [ 42 ] in honeycomb lattices have been commonly used for those purposes. In square lattices, topological interfaces can be reconfigured by rotation of gyro‐electric rods with external magnetic field, [ 45 ] phase changes in coupled ring resonators by heating, [ 41 ] and transparent conducting oxides. [ 46 ] However, previous works have been limited to the routing with special angles such as π /6, π /4, π /3, and π /2 accompanying with rather complicated structures and continuously tunable routing of topological edge states has still not been revealed.…”