Long-range molecular energy transfer mediated by strong coupling to plasmonic topological edge states

¹ Instituto de Estructura de la Materia (IEM-CSIC), Serrano 121, 28006, Madrid, Spain
² INL - International Iberian Nanotechnology Laboratory
³ Technology Innovation Institute, Masdar City 9639, Abu Dhabi, United Arab Emirates;
⁴ Department of Physics and Astronomy, University of Exeter, Stocker Road, Devon, EX4 4QL, UK
⁵ University of Bath, Claverton Down, Bath BA2 7AY, UK

^* E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Published online: 22 September 2025

Abstract

Strong coupling between light and molecular matter is currently attracting interest both in chemistry and physics, in the fast-growing field of molecular polaritonics [1] . The large near-field enhancement of the electric field of plasmonic surfaces and their high tunability make arrays of metallic nanoparticles an interesting platform to achieve and control strong coupling. Two dimensional plasmonic arrays with several nanoparticles per unit cell and crystalline symmetries can host topological edge and corner states. Here we explore the coupling of molecular materials to these edge states using a coupled-dipole framework including long-range interactions. We study both weak and strong coupling regimes and demonstrate that coupling to topological edge states can be employed to enhance highly-directional long-range energy transfer between molecules [2].