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

作者：Zhang, L.; Xiao, Sanshui^*

来源：Optical Materials Express, 2019, 9(2): 544-554.

DOI：10.1364/OME.9.000544

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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 gym-electric rods with broken time reversal symmetry. By calculating band structures and Chem numbers, in a simple square-lattice 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 army by locally controlling topological phases of the rods. These results may have potential applications in producing reconfigurable terahertz topological devices.

• 出版日期2019-2-1
• 单位中国计量大学