Optical cavities allow localization of electromagnetic field. Typical structures of microcavities contain alternating dielectric or semiconductor layers of different refractive indices with wedged shape, allowing finding resonance with the emitter, as quantum wells.
In our group we developed new kind of structure for investigation of strong coupling at room temperature using as a cavity material liquid crystals (LCs). Their use allow ease tuning, important to adapt to the cavity resonance with the excitonic mode in the emitter and reaching strong coupling regime. Tunability is possible due to tilting of anisotropic LC molecules induced by electric field applied to the whole structure. The big advantage of the LC microcavities is the simplicity of operation and the ability to work at room temperature. We investigate LC cavities with entire class of emitters: transition metal dichalcogenides, quantum dots, dyes, perovskites etc.