Hybrid topological photonic crystals

Abstract

Photonic topological phases offering unprecedented manipulation of electromagnetic waves have attracted much research interest which, however, have been mostly restricted to a single band gap. Here, we report on the experimental discovery of hybrid topological photonic crystals which host simultaneously quantum anomalous Hall and valley Hall phases in different photonic band gaps. The underlying hybrid topological phase manifests itself in the edge responses as the coexistence of the chiral edge states and valley Hall edge states in different frequency ranges. We experimentally verify such an emergent phenomenon and show that such a feature enables novel multiplexing of photon transport in the edge channels. Our study reveals a situation with coexisting topology of distinct nature in a single photonic system that may enable frequency-dependent filtering and manipulation of topological edge photons.

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Cited by in corpus (7)

• Multifrequency and multimode topological waveguides in a Stampfli-triangle photonic crystal with large valley Chern numbers
• Topological edge states in photonic Floquet insulator with unpaired Dirac cones
• Coexistent topological and chiral phonons in chiral RhGe: An ab initio study
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• Topological edge states in all-dielectric square-lattice arrays of bianisotropic microwave resonators
• Magnetic doping-induced second-order and first-order topological phase transition inthe photonic alloy
• Wilson Loop and Topological Properties in 3D Woodpile Photonic Crystal