DOI: https://doi.org/10.29363/nanoge.emlem.2024.034
Publication date: 13th July 2024
By incorporating optically active materials with high oscillator strength into optical microcavities, it is possible to reach the regime of strong light-matter interaction, whereby exciton-polariton quasiparticles are formed that are composed of both photon and exciton components. These polaritons can undergo non-equilibrium Bose-Einstein condensation at sufficiently high excitation density, exhibiting nonlinear emission, macroscopic coherence, and quantum fluid properties. While room-temperature polariton condensation with bulk crystalline thin films of CsPbBr₃ in microcavities has been achieved, progressing to colloidal quantum dots would not only allow much easier and flexible fabrication, but due to their strong 3D spatial confinement, would have the additional potential to facilitate enhanced polariton interactions.
We present strong light-matter coupling with thin films of colloidal CsPbBr₃ nanocrystals in optical microcavities and exciton-polariton condensation under ambient conditions. This is demonstrated by the observation of nonlinear increases in emission, narrowing of the linewidth, and coherence measurements. A tunable open microcavity based on distributed Bragg reflectors is employed to tune the polariton energy. By means of precise nanofabrication, tiny Gaussian-shaped deformations are created in the mirrors, effectively producing potential landscapes for the polariton condensate. This paves the way for the use of the polariton quantum fluid as an analogue simulator for Hamiltonians.
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