
Experiments at CWRU have developed organic cavity polaritons that display world record vacuum Rabi splittings of more than an eV. This ultrastrongly coupled polaritonic matter is a new regime for exploring non-linear optical effects. After a pedagogic introduction to cavity polaritons, we'll describe
quantum optics theory we use to quantitatively determine various non-linear optical effects including types of low harmonic generation (SHG and THG) in single and double cavity systems. Ultrastrongly coupled photon-matter systems such as these may be the foundation for technologies including low-power optical switching and computing.