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

L. Zhang, Sanshui Xiao*

*Corresponding author for this work

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In topological photonics, there is a class of designing approaches that usually tunes topological phase from trivial to non-trivial in a magneto-optical photonic crystal by applying an external magnetic field to break time reversal symmetry. Here we theoretically realize topological phase transition by rotating square gyro-electric rods with broken time reversal symmetry. By calculating band structures and Chern numbers, in a simple squarelattice photonic crystal, we demonstrate the topological phase transition at a specific orientation angle of the rods. Based on the dependence of topological phase on the orientation angle, we propose several terahertz devices including an isolator, circulator and splitter in a 50x50 reconfigurable rod array by locally controlling topological phases of the rods. These results may have potential applications in producing reconfigurable terahertz topological devices
Original languageEnglish
JournalOptical Materials Express
Issue number2
Pages (from-to)544-554
Publication statusPublished - 2019

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