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Chiral excited electronic states of molecules have an intrinsic sense ofhandedness, or twist, and are the active component in energy efficient displaytechnologies and in new photosynthetic routes to produce pharmaceuticals.Creating chiral states is achieved by manipulating the twistiness of thegeometric molecular structure. This is a demanding problem adding complexitydue to the need to precisely control molecular geometry. Here we demonstrate anovel concept for creating chiral excited states which does not rely onmolecular structure. Instead, it depends on hybridising a non chiral moleculewith a chiral electromagnetic field, producing a hybrid light matter chiralpolariton state. This is achieved by a symmetry controlled strong chiral-lightmatter interaction between an electromagnetic mode of a chiral nanocavity andan achiral molecule, a concept referred to as the electromagnetic enantiomer.This electromagnetic mechanism simplifies the creation of chiral electronicstates since it is far less demanding in terms of materials design. We haveillustrated the concept using an exemplar system relevant to organicoptoelectronic technology, producing efficient circularly polarised emissionfrom a non-chiral emitter molecule.

Symmetry control of strong chiral light matter interactions in photonic nanocavities for efficient circularly polarised emission