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Reconfigurable Topological Phases in Two-Dimensional Dielectric Photonic Crystals

State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China
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Crystals 2019, 9(4), 221; https://doi.org/10.3390/cryst9040221
Received: 1 March 2019 / Revised: 17 April 2019 / Accepted: 19 April 2019 / Published: 24 April 2019
(This article belongs to the Special Issue Recent Advances in Novel Topological Materials)
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Abstract

The extensive research on photonic topological insulators has opened up an intriguing way to control electromagnetic (EM) waves. In this work, we numerically demonstrate reconfigurable microwave photon analogues of topological insulator (TIs) in a triangular lattice of elliptical cylinders, according to the theory of topological defects. Multiple topological transitions between the trivial and nontrivial photonic phases can be realized by inhomogeneously changing the ellipse orientation, without altering the lattice structure. Topological protection of the edge states and reconfigurable topological one-way propagation at microwave frequencies, are further verified. Our approach provides a new route towards freely steering light propagations in dielectric photonic crystals (PCs), which has potential applications in the areas of topological signal processing and sensing. View Full-Text
Keywords: photonic topological insulator; multiple topological phase transitions; reconfigurable topological one-way propagation photonic topological insulator; multiple topological phase transitions; reconfigurable topological one-way propagation
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Huang, H.; Huo, S.; Chen, J. Reconfigurable Topological Phases in Two-Dimensional Dielectric Photonic Crystals. Crystals 2019, 9, 221.

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