A low-threshold nanolaser based on hybrid plasmonic waveguides at the deep subwavelength scale*
Li Zhi-Quan†, Piao Rui-Qi, Zhao Jing-Jing, Meng Xiao-Yun, Tong Kai
       
Dependence of lasing threshold of the fundamental hybrid plasmonic mode on h for the cases of gap width w = 2 nm, 5 nm, 10 nm, 15 nm, 20 nm ( r 1 = r 2 = 50 nm, d = 20 nm, r 3 = 2 r 1 + w /2 + d ): (a) the thresholds for all chosen parameters, (b) enlarged plot for the circled region in panel (a).