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We create exciton-polaritons in a zero-dimensional (0D) microcavity filledwith organic ladder-type conjugated polymer in the strong light-matterinteraction regime. Photonic confinement at wavelength scale is realized in thelongitudinal direction by two dielectric Bragg mirrors and laterally by asub-micron Gaussian-shaped defect. The cavity is separated into two partsallowing nanometer position control and enabling tuning of exciton and photonfractions of the polariton wavefunction. Polariton condensation is achievedwith non-resonant, picosecond optical excitation at ambient conditions andevidenced by a threshold behavior with non-linear increase of the emissionintensity, line narrowing and blue-shift of the emission peak. Furthermore,angular emission spectra show that condensation occurs in the ground state ofthe 0D-cavity, and first order coherence measurements reveal the coherentnature. These experiments open the door for polariton quantum fluids in complexexternal potentials at room temperature.

Room-Temperature Exciton-Polariton Condensation in a Tunable Zero-Dimensional Microcavity