We report an experimental study of the spontaneous spatial and temporal coherence of polariton condensates generated in the optical parametric oscillator configuration, below and at the parametric threshold, and as a function of condensate area. Above the threshold we obtain very long coherence times (up to 3 ns) and a spatial coherence extending over the entire condensate (40μm). The very long coherence time and its dependence on condensate area and pump power reflect the suppression of polariton-polariton interactions by an effect equivalent to motional narrowing.
Bibliographical noteThis paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-21-9-10792. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
Spano, R., Cuadra, J., Lingg, C., Sanvitto, D., Martin, M. D., Eastham, P. R., Poel, M. V. D., Hvam, J. M., & Viña, L. (2013). Build up of off-diagonal long-range order in microcavity exciton-polaritons across the parametric threshold. Optics Express, 21(9), 10792-10800. https://doi.org/10.1364/OE.21.010792