Nonlinear spectroscopy of exciton-polaritons in a GaAs-based microcavity

J. Schmutzler, M. Aßmann, T. Czerniuk, M. Kamp, C. Schneider, S. Höfling, M. Bayer

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17 Citations (Scopus)


We present a systematic investigation of two-photon excitation processes in a GaAs-based microcavity in the strong-coupling regime. We observe second harmonic generation resonant to the upper and lower polariton level, which exhibits a strong dependence on the photonic fraction of the corresponding polariton. In addition, we have performed two-photon excitation spectroscopy to identify 2p exciton states which are crucial for the operation as a terahertz lasing device, which was suggested recently [A. V. Kavokin et al., Phys. Rev. Lett. 108, 197401 (2012)]. However, no distinct signatures of a 2p exciton state could be identified, which indicates a low two-photon pumping efficiency.
Original languageEnglish
Article number075103
Number of pages6
JournalPhysical Review. B, Condensed matter and materials physics
Issue number7
Publication statusPublished - 4 Aug 2014


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