Topological light-trapping on a dislocation

Fei-Fei Li, Hai-Xiao Wang, Zhan Xiong, Qun Lou, Ping Chen, Rui-Xin Wu, Yin Poo (), Jian-Hua Jiang () and Sajeev John
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Fei-Fei Li: Nanjing University
Hai-Xiao Wang: Soochow University
Zhan Xiong: Soochow University
Qun Lou: Nanjing University
Ping Chen: Nanjing University
Rui-Xin Wu: Nanjing University
Yin Poo: Nanjing University
Jian-Hua Jiang: Soochow University
Sajeev John: Soochow University

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract Topological insulators have unconventional gapless edge states where disorder-induced back-scattering is suppressed. In photonics, such edge states lead to unidirectional waveguides which are useful for integrated photonic circuitry. Cavity modes, another type of fundamental component in photonic chips, however, are not protected by band topology because of their lower dimensions. Here we demonstrate that concurrent wavevector space and real-space topology, dubbed as dual-topology, can lead to light-trapping in lower dimensions. The resultant photonic-bound state emerges as a Jackiw–Rebbi soliton mode localized on a dislocation in a two-dimensional photonic crystal, as proposed theoretically and discovered experimentally. Such a strongly confined cavity mode is found to be robust against perturbations. Our study unveils a mechanism for topological light-trapping in lower dimensions, which is invaluable for fundamental physics and various applications in photonics.

Date: 2018
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DOI: 10.1038/s41467-018-04861-x

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