Fig. 4: Experimental demonstration of the flat-band multi-BIC lasers.
From: Ultracompact multibound-state-assisted flat-band lasers
a, Zoomed-in scanning electron microscopy image of the daisy-like air-hole photonic cavity. b, Scanning electron microscopy image of the fully fabricated laser device, incorporating the cavity structure displayed in a. c, L–I–V curves of the fabricated lasers. d, Laser spectra of the L = 5a device at various pumping current densities. e, Two-dimensional spectral mapping of the L = 5a laser as a function of the frequency and pumping current density. f, Laser spectrum of the L = 5a device at 0.27 kA cm–2 with a measured SMSR of ~20 dB. g–i, Scanning electron microscopy image (g), two-dimensional spectral mapping (h) and SMSR calculation (i) of the L = 9a device. j–l, Scanning electron microscopy image (j), two-dimensional spectral mapping (k) and SMSR calculation (l) of the L = 17a device.
