Linear and nonlinear response of exciton-polaritons in 2D perovskite nanocrystals

2D perovskites have attracted much attention recently due to their unique optical properties such as large photoluminescence quantum yield, strong absorption, and large tunability in their bandgaps. The variety of organic cations that can be incorporated into these systems allow for easy tunability of the structure and thereby their optoelectronic response. The 2D perovskites have emerged as a promising candidate for developing highly nonlinear exciton-polariton devices operating at low input powers. Furthermore, the large bandgaps and strong exciton binding energy in these materials allow the use of these devices at room temperature. Here we report the realization of a microcavity embedded with 2D perovskite nanocrystals of butylammonium lead iodide(BAPI, n=1) that shows strong exciton-photon coupling. The cavity is realized by spin coating the perovskite nanoparticle solution on a distributed Bragg reflector (DBR) followed by evaporation of silver acting as the top mirror. Polariton formation is established via Fourier space imaging of the cavity structure clearly showing Rabi splitting of 70 meV. Results of pump power dependence on the luminescence and resonant nonlinear response of the polariton states will be presented.