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Room-Temperature Exciton-Polariton Condensation in a Tunable Zero-Dimensional Microcavity
journal contribution
posted on 2017-09-29, 00:00 authored by Fabio Scafirimuto, Darius Urbonas, Ullrich Scherf, Rainer F. Mahrt, Thilo StöferleWe create exciton-polaritons in a
zero-dimensional (0D) microcavity
filled with organic ladder-type conjugated polymer in the strong light–matter
interaction regime. Photonic confinement at wavelength scale is realized
in the longitudinal direction by two dielectric Bragg mirrors and
laterally by a submicron Gaussian-shaped defect. The cavity is separated
into two parts, allowing nanometer position control and enabling tuning
of the exciton and photon fractions of the polariton wave function.
Polariton condensation is achieved with nonresonant picosecond optical
excitation under ambient conditions and evidenced by a threshold behavior
with a nonlinear increase in the emission intensity, line narrowing,
and a blue shift in the emission peak. Furthermore, angular emission
spectra show that condensation occurs in the ground state of the 0D
cavity, and first-order coherence measurements reveal the coherent
nature. These experiments open the door for polariton quantum fluids
in complex external potentials at room temperature.
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polariton wave functionTunable Zero-Dimensional Microcavitycoherence measurementsemission peakemission intensityambient conditionsPhotonic confinementdielectric Braggemission spectra show0 D cavitythreshold behaviorroom temperaturepolariton quantum fluidssubmicron Gaussian-shaped defectnonresonant picosecondnonlinear increasephoton fractionsRoom-Temperature Exciton-Polariton Condensationwavelength scalenanometer position controlground statePolariton condensation