Figure 3
From: Demonstration of critical coupling in an active III-nitride microdisk photonic circuit on silicon
Lasing at the critical coupling gap size: pulse energy dependent spectra measured (a) above the disk, (b) at the end of the waveguide for a device with A = 90° and g = 45 nm. The azimuthal numbers of the first-order radial modes are m = 86 and 85. The threshold energy density of the m = 86 mode is 1.7 mJ/cm2 per pulse.
