We propose a photonic crystal with Z2 topology purely based on dielectric materials. Deforming the honeycomb lattice of dielectric cylinders, such as silicon, we identify a pseudo spin degree of freedom, and the associated time-reversal symmetry similar to that of electronic systems . We demonstrate theoretically the nontrivial topology by showing photonic band inversion, and helical edge electromagnetic-wave propagation. Without requiring gyromagnetic, bi-anisotropic or piezo-magnetic materials, this topological photonic crystal can be fabricated easily and is compatible to electronics.
 L.-H. Wu and X. Hu: Phys. Rev. Lett. vol. 114, 223901 (2015).
Xiao Hu, "Topological photonics based on dielectric material
(Conference Presentation)," Proc. SPIE 9920, Active Photonic Materials VIII, 99201G (Presented at SPIE Nanoscience + Engineering: August 31, 2016; Published: 9 November 2016); https://doi.org/10.1117/12.2237228.5159519636001.
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