Lasing modes in ZnO nanowires coupled to planar metals

Abstract

Semiconductor nanowire lasers can be subject to modifications of their lasing threshold resulting from a variation of their environment. A promising choice is to use metallic substrates to gain access to low-volume Surface-Plasmon-Polariton (SPP) modes. We introduce a simple, yet quantitatively precise model that can serve to describe mode competition in nanowire lasers on metallic substrates. We show that an aluminum substrate can decrease the lasing threshold for ZnO nanowire lasers while for a silver substrate, the threshold increases compared with a dielectric substrate. Generalizing from these findings, we make predictions describing the interaction between planar metals and semiconductor nanowires, which allow to guide future improvements of highly-integrated laser sources.

Brightening and Directionality Control of Dark Excitons through Quasi-Bound States in the Continuum

“…The near-field intensity distribution in the surroundings of the nanoparticles determines the LDOS [62,63]. Specifically, strong electromagnetic energy concentrations in small volumes lead to high Purcell factors [64,65]. In the Purcell factor calculations, a dipole is considered as the illumination source.…”

Design of High-Q-Gradient Dielectric Nanoparticle Chain Surface Plasmonic Cavities

“…[1,3]. Over the past two decades, SPP lasers with different microcavity structures have emerged, such as nanoparticle SPP lasers [4,5], nanoparticle array SPP lasers [6][7][8][9], nanowire SPP lasers [10][11][12][13][14][15], nanosquare SPP lasers [16], and nanodisk SPP lasers [17].…”