Polaritons of inherently interacting molecules

Abstract

We investigate the absorption spectra of molecular ensembles strongly coupled to a Fabry-Pérot cavity and establish the microscopic origin of collective polaritonic bands. We show that long-range intermolecular interactions generate a large manifold of hybrid molecular-photonic states, even without disorder, vibrations, or thermal effects. The observed polariton bands are collective envelopes of these microscopic states, making photonic and molecular spectra strongly dependent on molecular arrangement. Our findings identify long-range intermolecular interactions as a key ingredient of molecular cavity QED.