Journal article
Design of terahertz reconfigurable devices by locally controlling topological phases of square gyro-electric rod arrays
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
Language: | English |
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Year: | 2019 |
Pages: | 544-554 |
ISSN: | 21593930 |
Types: | Journal article |
DOI: | 10.1364/OME.9.000544 |
ORCIDs: | Xiao, Sanshui and 0000-0002-6937-5658 |