Coupled electric dipole model for a Su-Schrieffer-Heeger chain of optically resonant coreshell nanoparticles

Abstract

Coreshell nanoparticles can combine optical features of different materials in a single nanostructure, which makes them interesting for many applications from biomedicine to energy harvesting. On the other hand, periodic arrays of plasmonic nanoparticles can exhibit topological phenomena such as topological edge states. Here we study periodic chains of Si@Ag coreshell nanoparticles. For this task, we combine the hybridization of surface plasmonic modes in complex nanostructures with the coupled electric dipole formalism employed for modelling the scattering of light by periodic arrays of small plasmonic nanoparticles. We propose treating coreshell nanoparticle as several coupled electric dipoles instead of just one and show how this is a more appropriate framework to study arrays of coreshell nanoparticles, which allows to build a one-to-one connection between the resonant modes of the nanoparticles and the dispersion bands of the system. Within this formalism, we show that a Su-Schrieffer-Heeger (SSH) chain of coreshell Si@Ag nanoparticles host multiple topological edge states pinned at the resonant frequencies of the coreshell nanoparticles.

arXiv comment21 pages, 8 figures

References in corpus (19)

• Classification of topological quantum matter with symmetries
• The discrete dipole approximation: an overview and recent developments
• Topological Edge Plasmon Modes between Diatomic Chains of Nanoparticles
• The effects of retardation on the topological plasmonic chain: plasmonic edge states beyond the quasistatic limit
• A perspective on topological nanophotonics: current status and future challenges
• Topological collective plasmons in bipartite chains of metallic nanoparticles
• Acoustic Su-Schrieffer-Heeger lattice: Direct mapping of acoustic waveguides to Su-Schrieffer-Heeger model
• The critical role of shell in enhanced fluorescence of metal-dielectric core-shell nanoparticles
• Topological phases, edge modes, and the Hofstadter butterfly in coupled Su-Schrieffer-Heeger systems
• Bulk-edge correspondence and long range hopping in the topological plasmonic chain
• Coupled electric and magnetic dipole formulation for planar arrays of dipolar particles: metasurfaces with various electric and/or magnetic meta-atoms per unit cell
• Topological plasmons in dimerized chains of nanoparticles: robustness against long-range quasistatic interactions and retardation effects
• Topologically protected second-harmonic generation via doubly resonant high-order photonic modes
• Winding number and Zak phase in multi-band SSH models
• Topological Graphene plasmons in a plasmonic realization of the Su-Schrieffer-Heeger Model
• Hybridized exciton-polariton resonances in core-shell nanoparticles
• Near- and Far-Field Excitation of Topological Plasmonic Metasurfaces
• Electrostatic dipole polarizability and plasmon resonances of multilayer nanoshells
• Small mode volume topological photonic states in one-dimensional lattices with dipole--quadrupole interactions