Reconfigurable topological waveguide based on honeycomb lattice of dielectric cuboids
We show that the photonic crystal (PhC) made of dielectric cuboids with their centers forming a honeycomb lattice is characterized by a ℤ2${\mathbb{ℤ}}_{2}$ topological index when the longer sides of six cuboids point towards the center of hexagonal unit cell. While the C6v symmetry regar...
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| Format: | Article |
| Language: | English |
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De Gruyter
2020-06-01
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| Series: | Nanophotonics |
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| Online Access: | https://doi.org/10.1515/nanoph-2020-0146 |
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doaj-a900d8abc8034a8080d45a1673847af12021-09-06T19:20:35ZengDe GruyterNanophotonics2192-86062192-86142020-06-019103451345810.1515/nanoph-2020-0146Reconfigurable topological waveguide based on honeycomb lattice of dielectric cuboidsWang Xing-Xiang0Hu Xiao1International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science, Tsukuba, 305-0044, JapanInternational Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science, Tsukuba, 305-0044, JapanWe show that the photonic crystal (PhC) made of dielectric cuboids with their centers forming a honeycomb lattice is characterized by a ℤ2${\mathbb{ℤ}}_{2}$ topological index when the longer sides of six cuboids point towards the center of hexagonal unit cell. While the C6v symmetry regarding the center of unit cell is preserved, the C3 symmetry regarding honeycomb sites is broken, which opens a bandgap in the Dirac dispersion of honeycomb structure and induces a band inversion between p modes and d modes. Rotating cuboids around their individual centers closes the bandgap and reopens a trivial bandgap. We discuss that this feature can be exploited for realizing a reconfigurable topological waveguide.https://doi.org/10.1515/nanoph-2020-0146dielectricshoneycomb latticephotonic crystaltopology42.70.qs03.65.vf73.43.-f |
| collection |
DOAJ |
| language |
English |
| format |
Article |
| sources |
DOAJ |
| author |
Wang Xing-Xiang Hu Xiao |
| spellingShingle |
Wang Xing-Xiang Hu Xiao Reconfigurable topological waveguide based on honeycomb lattice of dielectric cuboids Nanophotonics dielectrics honeycomb lattice photonic crystal topology 42.70.qs 03.65.vf 73.43.-f |
| author_facet |
Wang Xing-Xiang Hu Xiao |
| author_sort |
Wang Xing-Xiang |
| title |
Reconfigurable topological waveguide based on honeycomb lattice of dielectric cuboids |
| title_short |
Reconfigurable topological waveguide based on honeycomb lattice of dielectric cuboids |
| title_full |
Reconfigurable topological waveguide based on honeycomb lattice of dielectric cuboids |
| title_fullStr |
Reconfigurable topological waveguide based on honeycomb lattice of dielectric cuboids |
| title_full_unstemmed |
Reconfigurable topological waveguide based on honeycomb lattice of dielectric cuboids |
| title_sort |
reconfigurable topological waveguide based on honeycomb lattice of dielectric cuboids |
| publisher |
De Gruyter |
| series |
Nanophotonics |
| issn |
2192-8606 2192-8614 |
| publishDate |
2020-06-01 |
| description |
We show that the photonic crystal (PhC) made of dielectric cuboids with their centers forming a honeycomb lattice is characterized by a ℤ2${\mathbb{ℤ}}_{2}$ topological index when the longer sides of six cuboids point towards the center of hexagonal unit cell. While the C6v symmetry regarding the center of unit cell is preserved, the C3 symmetry regarding honeycomb sites is broken, which opens a bandgap in the Dirac dispersion of honeycomb structure and induces a band inversion between p modes and d modes. Rotating cuboids around their individual centers closes the bandgap and reopens a trivial bandgap. We discuss that this feature can be exploited for realizing a reconfigurable topological waveguide. |
| topic |
dielectrics honeycomb lattice photonic crystal topology 42.70.qs 03.65.vf 73.43.-f |
| url |
https://doi.org/10.1515/nanoph-2020-0146 |
| work_keys_str_mv |
AT wangxingxiang reconfigurabletopologicalwaveguidebasedonhoneycomblatticeofdielectriccuboids AT huxiao reconfigurabletopologicalwaveguidebasedonhoneycomblatticeofdielectriccuboids |
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1717776499999768576 |