Low threshold gain metal coated laser nanoresonators.
We introduce a low refractive index layer between the metal and the gain medium in metal-coated laser resonators and demonstrate that it can significantly reduce the dissipation losses. Analysis of a gain medium waveguide shows that for a given waveguide radius, the low index layer has an optimal thickness for which the lasing threshold gain is minimal. The waveguide analysis is used for the design of a novel three-dimensional cylindrical resonator that is smaller than the vacuum wavelength in all three dimensions and exhibits a low enough threshold gain to lase at room temperature.
Mizrahi
Amit
A
Department of Electrical and Computer Engineering, University of California San Diego, La Jolla, CA 92093-0407, USA. amitmiz@ece.ucsd.edu
Lomakin
Vitaliy
V
Slutsky
Boris A
BA
Nezhad
Maziar P
MP
Feng
Liang
L
Fainman
Yeshaiahu
Y