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Frontiers in Optics

Mixing-time evolution of coherent exciton-polariton response due to many-body interactions

Jagannath Paul, Jared K. Wahlstrand, Alan D. Bristow

Published Jan 1, 2020• 0 citations
Publisher

Abstract

Multidimensional coherent spectra are presented for exciton-polaritons in a semiconductor microcavity at cryogenic temperatures as a function of mixing time. A decrease in vacuum Rabi splitting is observed along with spectral phase shifts.
DOI
10.1364/ls.2020.ltu6f.3

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We have used femtosecond optical spectroscopy to observe directly the vacuum Rabi oscillations associated with the coupled exciton-photon mode splitting in a semiconductor quantum microcavity. When the microcavity is impulsively excited by a coherent short optical pulse, the time-resolved emission from the cavity shows beats corresponding to the oscillation between cavity and exciton modes, with a decay corresponding to approximately twice the cavity lifetime. Interferometric pump-probe measurements clearly show the coherent evolution of the cavity polarization.
We present an overview of our results concerning the influence of two-pair continuum coherences on the transient nonlinear optical response of semiconductor microcavities. We show that the interplay between these 4-particle coherences and the nonperturbative light-matter interaction produces highly desirable almost decoherence-free exciton-exciton collisions on the lower polariton branch. This effect gives rise to the very different nonlinear absorption rates on the two polariton branches observed in many experiments and make possible to reach a very high degree of amplification in samples with large Rabi splitting. Moreover, we show that the availability of almost decoherence free exciton-exciton collisions can be used for the realization of coherent trapping of polariton emission and amplification. This coherent manipulation and trapping of many-particle polariton states can be performed employing both ultrafast and continuous wave operation.