Exciting Pseudospin Dependent Edge States in Plasmonic Metasurfaces

Abstract

We study a plasmonic metasurface that supports pseudospin dependent edge states confined at a subwavelength scale, considering full electrodynamic interactions including retardation and radiative effects. The spatial symmetry of the lattice of plasmonic nanoparticles gives rise to edge states with properties reminiscent of the quantum spin Hall effect in topological insulators. However, unlike the spin-momentum locking characteristic of topological insulators, these modes are not purely unidirectional and their propagation properties can be understood by analysing the spin angular momentum of the electromagnetic field, which is inhomogenous in the plane of the lattice. The local sign of the spin angular momentum determines the propagation direction of the mode under a near-field excitation source. We also study the optical response under far-field excitation and discuss in detail the effects of radiation and retardation.

arXiv comment32 pages, 5 figures (Supporting Information: 3 pages, 2 figures)

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• Near- and Far-Field Excitation of Topological Plasmonic Metasurfaces
• Breakdown of spin-to-helicity locking at the nanoscale in topological photonic crystal edge states
• Terahertz topological plasmon polaritons for robust temperature sensing
• Energy density as a probe of band representations in photonic crystals
• Long-range molecular energy transfer mediated by strong coupling to plasmonic topological edge states
• Beyond Decoherence: Control the Collective Quantum Dynamics of Quasi Particles in Topological Interface