Spano, R.3; Cuadra, J.3; Lingg, C.3; Sanvitto, D.3; Martin, M. D.3; Eastham, P. R.4; Poel, Mike van der1; Hvam, Jørn Märcher1; Viña, L.3
1 Department of Photonics Engineering, Technical University of Denmark2 Nanophotonics Theory and Signal Processing, Department of Photonics Engineering, Technical University of Denmark3 Universidad Autónoma de Madrid4 Trinity College Dublin
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.
Optics Express, 2013, Vol 21, Issue 9, p. 10792-10800