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Exciton-polaritons (polaritons herein) offer a unique nonlinear platform forstudies of collective macroscopic quantum phenomena in a solid state system.Shaping of polariton flow and polariton confinement via potential landscapescreated by nonresonant optical pumping has gained considerable attention due tothe degree of flexibility and control offered by optically-induced potentials.Recently, large density-dependent energy shifts (blueshifts) exhibited byoptically trapped polaritons at low densities, below the bosonic condensationthreshold, were interpreted as an evidence of strong polariton-polaritoninteractions [Nat. Phys. 13, 870 (2017)]. In this work, we further investigatethe origins of these blueshifts in optically-induced circular traps and presentevidence of significant blueshift of the polariton energy due to reshaping ofthe optically-induced potential with laser pump power. Our work demonstratesstrong influence of the effective potential formed by an optically-injectedexcitonic reservoir on the energy blueshifts observed below and up to thepolariton condensation threshold and suggests that the observed blueshiftsarise due to interaction of polaritons with the excitonic reservoir, ratherthan due to polariton-polariton interaction.

Effect of optically-induced potential on the energy of trapped exciton-polaritons below the condensation threshold