Ultra-low threshold polariton lasing in photonic crystal cavities
  The authors show clear experimental evidence of lasing of exciton polaritons confined in L3 photonic crystal cavities. The samples are based on an InP membrane in air containing five InAsP quantum wells. Polariton lasing is observed with thresholds as low as 120 nW, below the Mott transition, while conventional photon lasing is observed for a pumping power one to three orders of magnitude higher. 
Stefano Azzini, Dario Gerace, Matteo Galli, Isabelle Sagnes, R\'emy   Braive, Aristide Lema\^itre, Jacqueline Bloch and Dani...
cond-mat.other physics.optics