Fig. 1. (Color online) (a) Schematic of the nano-plate based SPASER sample, where a thin nano-plate atop silver layer separated by a 10 nm SiO₂ gap. (b) SEM image of nano-plate arrays. (c) SEM image of SPASER with single nano-plate (200 nm in width, 1 μm in length, 3μm in height).

Fig. 2. (Color online) (a) The PL spectra of nano-plate without Ag film under different optical pumping power density. (b) Corresponding L–L curve of the PL peak intensity and the FWHM in the log–log scale as a function of optical pumping power density. (c) PL emission of SPASER with increasing the same optical pumping power density. (d) Corresponding L–L curve and FWHM of the dominant lasing peak at 502 nm as a function of the excited power density.

Fig. 3. (Color online) (a) Simulated electric field distribution of plasmonic laser at 502 nm. (b) Simulated electric field distribution of the Nano-plate gain material without Ag film at 520 nm.

Fig. 4. (Color online) TRPL spectra of SPASER at the peak of 502 nm (red line) and InGaN/GaN nano-plate at the peak of 520 nm (black line).