We establish a tunable open-access microcavity consisting of two planar distributed Bragg reflectors (DBRs) individually controlled by nanopositioners. By varying the cavity length, such configuration enables variation of the light–matter coupling strength by a factor of 2, while keeping in microresonators the same active region and cavity mirrors. Polariton condensation was demonstrated over a large range of Rabi splittings and the corresponding threshold diagram was derived as a function of cavity-exciton detuning, which fits well with theoretical simulations. The results show that for various light-matter coupling strengths, optimal detunings featured by the lowest condensation threshold always occur at a fixed depth of energy trap between the exciton reservoir and the polariton ground state, which enables the most efficient exciton–exciton scattering into the condensate state in the driven-dissipative polaritonic system.
Condensation of 2D exciton-polaritons in an open-access microcavity
Feng Li, Yiming Li, L. Giriunas, M. Sich, D. D. Solnyshkov, G. Malpuech, A. A. P. Trichet, J. M. Smith, E. Clarke, M. S. Skolnick, D. N. Krizhanovskii; Condensation of 2D exciton-polaritons in an open-access microcavity. J. Appl. Phys. 7 March 2022; 131 (9): 093101. https://doi.org/10.1063/5.0076459
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