Open AccessAntiboding and bonding lasing modes with low gain threshold in nonlocal metallic nanoshell
Author(s) -
Yang Huang,
Jun Jun Xiao,
Lei Gao
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.008818
Subject(s) - nanolaser , lasing threshold , antibonding molecular orbital , active laser medium , optics , materials science , plasmon , refractive index , laser , optoelectronics , dielectric , gain switching , nanophotonics , wavelength , physics , laser power scaling , quantum mechanics , atomic orbital , electron
Based on a full-wave nonlocal Mie theory, we establish the spaser generation condition for compact plasmonic nanolasers in the long-wavelength limit for dielectric-metal core-shell nanoparticles. We found that there exist two lasing states arising from the hybridized antibonding and bonding modes for this coated nanolaser. By varying the surrounding medium and the gain materials, we can achieve low gain threshold for each mode with flexible radii ratios on the purpose of realistic easy fabrication. Numerical results show that nonlocal effects have different influences on the required gain threshold and gain refractive index of these two lasing modes, which may be of great importance in the design of such kind of ultrasmall nanoparticle lasers.