Figure 2 |Ridge photonic crystal and associated topological surface states. (IMAGE)

Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, CAS

Figure 2 |Ridge photonic crystal and associated topological surface states.

Caption

a, Unit cell of the ridge photonic crystal. b, Bulk band structure of the ridge photonic crystal, where a partial gap opened in the vicinity of nodal ring. c, Dispersion relation of topological surface states. d, Measured angle-resolved reflection spectra for both polarizations. Two lines of reflection dips (highlighted by the black arrows) inside the band gap demonstrates the topological surface states.

Credit

by Wei-Min Deng, Ze-Ming Chen, Meng-Yu Li, Chao-Heng Guo, Zhong-Tao Tian, Ke-Xin Sun, Xiao-Dong Chen, Wen-Jie Chen, and Jian-Wen Dong

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