Coulomb and quenching effects in small nanoparticle-based spasers

We study numerically the effect of mode mixing and direct dipole-dipole interactions between gain molecules on spasing in a small composite nanoparticles with a metallic core and a dye-doped dielectric shell. By combining Maxwell-Bloch equations with Green's function formalism, we calculate las...

Full description

Saved in:
Bibliographic Details
Published in:arXiv.org 2016-02
Main Authors: Pustovit, Vitaliy N, Urbas, Augustine M, Chipouline, Arkadi, Shahbazyan, Tigran V
Format: Article
Language:English
Subjects:
Coupling (molecular)
Dipole interactions
Green's functions
Nanoparticles
Parameter identification
Population inversion
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We study numerically the effect of mode mixing and direct dipole-dipole interactions between gain molecules on spasing in a small composite nanoparticles with a metallic core and a dye-doped dielectric shell. By combining Maxwell-Bloch equations with Green's function formalism, we calculate lasing frequency and threshold population inversion for various gain densities in the shell. We find that gain coupling to nonresonant plasmon modes has a negligible effect on spasing threshold. In contrast, the direct dipole-dipole coupling, by causing random shifts of gain molecules' excitation frequencies, hinders reaching the spasing threshold in small systems. We identify a region of parameter space in which spasing can occur considering these effects.
ISSN:2331-8422
DOI:10.48550/arxiv.1602.00612