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.
Department of Electrical and Computer Engineering, University of California San Diego, La Jolla, CA 92093-0407, USA. amitmiz@ece.ucsd.edu
Amit
A
Mizrahi
Vitaliy
V
Lomakin
Boris A
BA
Slutsky
Maziar P
MP
Nezhad
Liang
L
Feng
Yeshaiahu
Y
Fainman