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Resonant interaction between excitonic transitions of molecules and localizedelectromagnetic field allows the formation of hybrid light-matter polaritonicstates. This hybridization of the light and the matter states has been shown tobe able to significantly alter the intrinsic properties of molecular ensemblesplaced inside the optical cavity. Here, we have achieved strong couplingbetween the excitonic transition in typical oligonucleotide-based molecularbeacons labelled with a pair of organic dye molecules, demonstrating anefficient donor to acceptor resonance energy transfer, and the tuneableopen-access cavity mode. The photoluminescence of this hybrid system undernon-resonant laser excitation and the dependence of the relative population oflight-matter hybrid states on cavity detuning have been characterized.Furthermore, by analysing the dependence of the relaxation pathways betweenenergy states in this system, we have demonstrated that predominant strongcoupling of the cavity photon to the exciton transition in the donor dyemolecule can lead to such a large an energy shift that the energy transfer fromthe acceptor exciton reservoir to the mainly donor lower polaritonic state canbe achieved, thus yielding the chromophores donor-acceptor role reversal orcarnival effect. Our experimental data confirm the theoretically predictedpossibility for confined electromagnetic fields to control and mediatepolariton-assisted remote energy transfer thus paving the way to new approachesto remote-controlled chemistry, energy harvesting, energy transfer and sensing.

Polariton-assisted donor-acceptor role reversal in resonant energy  transfer between organic dyes strongly coupled to electromagnetic modes of a  tuneable microcavity