Coulomb and quenching effects in small nanoparticle-based spasers

Vitaliy N. Pustovit, Augustine M. Urbas, Arkadi V. Chipouline, Tigran V. Shahbazyan

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

We study numerically the effect of mode mixing and direct dipole-dipole interactions between gain molecules on spasing in 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.

Original languageEnglish
Article number165432
JournalPhysical Review B
Volume93
Issue number16
DOIs
Publication statusPublished - 25 Apr 2016
Externally publishedYes

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