Abstract
Photonic topological states have revolutionized the understanding of the propagation and scattering of light. The recent discovery of higher‐order photonic topological insulators opens an emergent horizon for 0D topological corner states. However, the previous realizations of higher‐order topological insulators in electromagnetic‐wave systems suffer from either a limited operational frequency range due to the lumped components involved or a bulky structure with a large footprint, which are unfavorable for achieving compact photonic devices. To overcome these limitations, a planar surface‐wave photonic crystal realization of 2D higher‐order topological insulators is hereby demonstrated experimentally. The surface‐wave photonic crystals exhibit a very large bulk bandgap (a bandwidth of 28%) due to multiple Bragg scatterings and host 1D gapped edge states described by massive Dirac equations. The topology of those higher‐dimensional photonic bands leads to the emergence of in‐gap 0D corner states, which provide a route toward robust cavity modes for scalable compact photonic devices.
Highlights
The quest for topological 0D cavity photonic topological insulators opens an emergent horizon for 0D topological corner states
The surface-wave photonic crystals exhibit a very large bulk bandgap due to multiple Bragg scatterings and host 1D gapped edge states described by massive Dirac realized using the higher-order topolo gical insulators.[27,28,29,30,31,32,33,34,35,36,37]
Unlike the conventional D-dimensional topological insulators which have (D−1)-dimensional topological gapless boundary states, a D-dimensional higher-order topological equations. The topology of those higher-dimensional photonic bands leads insulator gives rise to (D − 2)-dimensional to the emergence of in-gap 0D corner states, which provide a route toward robust cavity modes for scalable compact photonic devices
Summary
The quest for topological 0D cavity photonic topological insulators opens an emergent horizon for 0D topological corner states. Higher-Order Topological States in Surface-Wave Photonic Crystals The surface-wave photonic crystals exhibit a very large bulk bandgap (a bandwidth of 28%) due to multiple Bragg scatterings and host 1D gapped edge states described by massive Dirac realized using the higher-order topolo gical insulators.[27,28,29,30,31,32,33,34,35,36,37] Unlike the conventional D-dimensional topological insulators which have (D−1)-dimensional topological gapless boundary states, a D-dimensional higher-order topological equations.
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