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Higher‐order topological insulators (HOTIs) represent a new type of topological system, supporting boundary states localized over boundaries, two or more dimensions lower than the dimensionality of the system itself. Interestingly, photonic HOTIs can possess a richer physics than their original condensed matter counterpart, supporting conventional HOTI states based on tight‐binding coupling, and a...
In article number 2004376 Andrea Alù, Alexander B. Khanikaev, and co‐workers apply a near‐field technique to investigate a higher‐order topological photonic metasurface. They show that the near‐field profiles reveal the topological nature of the optical modes (depicted as a torus). Topology manifests in the displacement of the Wannier center, giving rise to the topological dipole polarization and...
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