Fig. 3: White light intensity dependent cavity reflection.
From: Enhanced nonlinear interaction of polaritons via excitonic Rydberg states in monolayer WSe2
a–c Angle resolved reflection for different incident intensities of \(0.25\; {\rm{mW}}/{{\rm{\mu }}{\rm{m}}}^{2}\) (a), \(30\; {\rm{mW}}/{{\rm{\mu }}{\rm{m}}}^{2}\) (b), and \(250\; {\rm{mW}}/{{\rm{\mu }}{\rm{m}}}^{2}\) (c). Higher intensities imply a higher density of polaritons, which eventually leads to an excitation blockade induced by the strong interaction between excitons. This polariton blockade reduces the effective coupling to the cavity, observed as a decreasing splitting of the two polariton branches in our experiments. The analysis for nonlinear interacion is carried out below 30 mW/µm2 where the system is well under the strong coupling regime.
