Abstract
We investigated THz phonon-polaritons in a lead halide perovskite film with metamaterials. Rabi splitting occurred when we tune the metamaterial resonance with the phonon resonance of the perovskite film, due to the strong coupling between the resonances. The polaritonic branches exhibited the dispersion curve with a clear anti-crossing behavior as a function of the metamaterial resonance. Rabi splitting versus crystal volume fraction were obtained with in-situ THz spectroscopy in which we found a unique power-law scaling, depending on the crystal growth dimensions.
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