GHz acoustic modulation selectively transfers the population of a multimode exciton-polariton condensate into its photonic ground state, producing a coherent frequency comb and picosecond pulsed emission.
Time-periodic driving of a bath-coupled open quantum gas of light
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abstract
We study the frequency-resolved density response of a photon Bose-Einstein condensate coupled to a bath of dye molecules by time-periodic driving. By monitoring the photon number dynamics for different drive frequencies, we obtain the spectral response of the condensate in a phase-sensitive way. We find that as the photon number increases, the response of the coupled condensate-bath system transitions from overdamped to resonant behavior, indicating a transition from closed to open system dynamics. Our spectroscopy method paves the way for studies of collective excitations in complex driven-dissipative systems.
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Ground state exciton-polariton condensation by coherent Floquet driving
GHz acoustic modulation selectively transfers the population of a multimode exciton-polariton condensate into its photonic ground state, producing a coherent frequency comb and picosecond pulsed emission.