Effect of plasmonic mode on plasmon-based lasers

Type Article
Date 2018-12
Language English
Author(s) Dridi Montacer1, Colas FlorentORCID1, Compere ChantalORCID2
Affiliation(s) 1 : Ifremer, REM RDT LDCM, F-29280 Plouzane, France.
2 : Ifremer, REM RDT, F-29280 Plouzane, France.
Source Journal Of The Optical Society Of America B-optical Physics (0740-3224) (Optical Soc Amer), 2018-12 , Vol. 35 , N. 12 , P. 3110-3115
DOI 10.1364/JOSAB.35.003110
Abstract

For the last few years, plasmon-based lasers have been investigated theoretically and experimentally. Several configurations have been reported. They are composed of quantum emitters coupled to a plasmonic structure. In this paper, we investigate the effect of the plasmon mode on the far-field and near-field characteristics of a nanolaser composed by a periodic array of metallic nanoparticles covered by gain materials under optical pumping. Two configurations were investigated. The first structure supported a localized surface plasmon (LSP) mode, while the second a surface lattice plasmon (SLP) mode. This theoretical work relies on semi-quantum calculations based on a four-level gain molecule and a time-domain approach. We demonstrated that lasing in a SLP mode requires a lower concentration of quantum emitters and generates a higher far-field emission with a lower threshold than lasing in a LSP mode. At nanoscale, near-field enhancement at the emission wavelength and above the threshold is 2 orders of magnitude higher with the SLP than the LSP mode. Our results with a general character show that designing a plasmon-based laser that sustains the SLP mode will result in a better lasing efficiency than with a LSP mode. (C) 2018 Optical Society of America

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