Enhanced light-matter coupling and optical pumping of THz intersubband polaritons

We investigate the engineering of the strong light-matter coupling between a THz cavity and intersubband transitions for novel THz polaritonic devices. By varying the duty cycle of the cavity grating, we show how the light-matter interaction can be engineered over a large k-space range, measured using THz time domain spectroscopy (TDS) and fitted using a RCWA model. Secondly, we show how the reflectivity response of such cavities under optical pumping.