Fig. 6: Dark emission of plasmonic nanolasers132.
a Schematic of the radiation of a plasmonic nanolaser based on a metal-insulator-semiconductor gap mode, which consists of free-space photon radiation and SPP dark emission. b Surface plasmon generation efficiencies of nanowire plasmonic nanolasers with various diameters operating in the fundamental plasmonic mode. c, d Real-space (c) and momentum-space (d) images of plasmonic nanolaser emission obtained via leakage radiation microscopy. The white polygon in c indicates the profile of the nanolaser.
