Fig. 2
From: Unusual scaling laws for plasmonic nanolasers beyond the diffraction limit
Room temperature ultralow threshold plasmonic nanolaser. a Laser spectrum of a plasmonic nanolaser with a threshold of ~32 kW cm−2. Inset: atomic force microscope image of the device. b Spectra normalized to peak value vs. pump power highlighting the emergence of a dominant laser mode with reduced linewidth over the spontaneous emission. c Light–light curve of the plasmonic nanolaser (dots show data values). The spontaneous emission coupling (β) factor of the nanolaser is about 0.09 (red line). Black, pink, and blue lines are reference light–light curves corresponding to β = 1, β = 0.5, β = 0.05
