Exploring Polaritons in Optically-Anisotropic Media

We explore the properties and functionalities of polaritons that emerge by the coupling of systems characterised by a collective excitonic response, such as J aggregates of organic molecules or excitons in transition-metal dichalcogenides, with optically anisotropic open cavities, typically in the form of individual nanoparticles or aggregates thereof. We examine examples where the optical anisotropy is due to either the structural chirality of the cavity or to an applied magnetic field, and discuss the flexibility and advanced engineering possibilities provided by this additional degree of freedom.