Topological light-trapping on a dislocation

Abstract

Topology has been revealed to play a fundamental role in physics in the past decades. 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 chips. Cavity modes, another type of fundamental components 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 the "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 (2D) photonic crystal, as predicted theoretically and discovered experimentally. Such a strongly-confined 0D localized mode, which is solely due to the topological mechanism, is found to be robust against perturbations. Our study unveils a new mechanism for topological light-trapping in lower-dimensions, which is valuable for fundamental physics and a variety of applications in photonics.

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Cited by in corpus (49)

• Topological Photonics
• Visualization of higher-order topological insulating phases in two-dimensional dielectric photonic crystals
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• Photonic quadrupole topological phases
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• Topological one-way fiber of second Chern number
• Topolectric circuits: Theory and construction
• Experimental realization of single-plaquette gauge flux insertion and topological Wannier cycles
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• Coupling between Exciton-Polariton Corner Modes through Edge States
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• Trapped state at a dislocation in a weak magnetomechanical topological insulator
• Topological materials for full-vector elastic waves
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• Jackiw-Rebbi states in interfaced binary waveguide arrays with Kerr nonlinearity
• Second-order topological modes in two-dimensional continuous media
• Observing 0D subwavelength-localized modes at ~100 THz protected by weak topology
• Bulk Localised Transport States in Infinite and Finite Quasicrystals via Magnetic Aperiodicity
• Topological Wannier cycles for the bulk and edges
• Emergent metallicity at the grain boundaries of higher-order topological insulators
• Observation of dislocation-induced topological modes in a three-dimensional acoustic topological insulator
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