Manipulating topological valley modes in plasmonic metasurfaces
Matthew Proctor, Paloma A. Huidobro, Stefan A. Maier, Richard V. Craster, Mehul P. Makwana
Abstract
Abstract Coupled light‐matter modes supported by plasmonic metasurfaces can be combined with topological principles to yield subwavelength topological valley states of light. This study gives a systematic presentation of the topological valley states available for lattices of metallic nanoparticles (NPs): all possible lattices with hexagonal symmetry are considered as well as valley states emerging on a square lattice. Several unique effects that have yet to be explored in plasmonics are identified, such as robust guiding, filtering, and splitting of modes, as well as dual‐band effects. These are demonstrated by means of scattering computations based on the coupled dipole method that encompass full electromagnetic interactions between NPs.