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Room-temperature exceptional-point-driven polariton lasing from perovskite metasurface

M.A. MasharinA.K. SamusevA.A. BogdanovI.V. IorshH.V. DemirS.V. Makarov
Dec 2022
摘要
Excitons in lead bromide perovskites exhibit high binding energy and highoscillator strength, allowing for a strong light-matter coupling regime in theperovskite-based cavities localizing photons at the nanoscale. This opens upthe way for the realization of exciton-polariton Bose-Einstein condensation andpolariton lasing at room temperature -- the inversion-free low-thresholdstimulated emission. However, polariton lasing in perovskite planar photoncavities without Bragg mirrors has not yet been observed and provedexperimentally. In this work, we employ perovskite metasurface, fabricated withnanoimprint lithography, supporting so-called exceptional points to demonstratethe room-temperature polariton lasing. The exceptional points inexciton-polariton dispersion of the metasurface appear upon optically pumpingin the nonlinear regime in the spectral vicinity of a symmetry-protected boundstate in the continuum providing high mode confinement with the enhanced localdensity of states beneficial for polariton condensation. The observed lasingemission possesses high directivity with a divergence angle of around 1$^\circ$over one axis. The employed nanoimprinting approach for solution-processablelarge-scale polariton lasers is compatible with various planar photonicplatforms suitable for on-chip integration.
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