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9 September 2019 Edge and higher order topological states in photonic metasurfaces (Conference Presentation)
Alexander B. Khanikaev
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Proceedings Volume 11081, Active Photonic Platforms XI; 110810B (2019) https://doi.org/10.1117/12.2529305
Event: SPIE Nanoscience + Engineering, 2019, San Diego, California, United States
Abstract
Topological systems are inherently robust to disorder and continuous perturbations, resulting in dissipation-free edge transport of electrons in quantum solids, or reflectionless guiding of photons and phonons in classical wave systems characterized by topological invariants. These established examples of topological physics, however, do not exhaust all possible topological phases, and recently a new class of topological metamaterials characterized by bulk polarization has been introduced. In addition to edge conduction, these systems have been shown to host higher-order topological states, such as corner states. Here, we introduce topological bulk polarization in two-dimensional Kagome photonic meta-structures, and observe topological transitions as the design parameters are tuned. We demonstrate that our topological meta-structure hosts both 1D edge and Wannier-type second-order corner states with unique properties. The edge states have the angular momentum that reverses for opposite propagation direction, thus supporting directional excitation. We also observe the second order topological states protected by the generalized chiral symmetry of the meta-structure, which are localized at the corners and are pinned to ‘zero energy’. Interestingly, unlike the corner states protected by the conventional chiral symmetry, the generalized chiral symmetry of our three-atom sublattice enables their spectral overlap with the continuum of bulk states without leakage. Our findings open new directions in photonics for controlling propagation and manipulating electromagnetic waves, including within the radiative continuum.
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Alexander B. Khanikaev "Edge and higher order topological states in photonic metasurfaces (Conference Presentation)", Proc. SPIE 11081, Active Photonic Platforms XI, 110810B (9 September 2019); https://doi.org/10.1117/12.2529305
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KEYWORDS
Polarization
Radio propagation
Electrons
Metamaterials
Phonons
Photon polarization
Photons
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