Measurement of the second-order coherence function for metallic   nanolasers
  Due to the high spontaneous emission coupled into the resonance mode in metallic nanolasers, there has been a debate concerning the coherence properties of this family of light sources. The second-order coherence function can unambiguously determine the nature of a given radiation. In this paper, an approach to measure the second-order coherence function for broad linewidth sources in the near-infrared telecommunication band is established based on a modified Hanbury Brown and Twiss configuration. Using this set-up, it is shown that metallic coaxial and disk-shaped nanolasers with InGaAsP multiple quantum well gain systems are indeed capable of generating coherent radiation. 
William E. Hayenga, Hipolito Garcia-Gracia, Hossein Hodaei, Christian   Reimer, Roberto Morandotti, Patrick Likamwa, Mercede...
physics.optics