All-dielectric nanolaser

TL;DR

This paper theoretically demonstrates that a subwavelength dielectric nanoparticle with a gain shell can function as a low-threshold nanolaser, leveraging Mie resonances and high refractive index materials.

Contribution

It introduces a novel all-dielectric nanolaser design with a general lasing threshold condition, reducing reliance on lossy plasmonic metals.

Findings

Lasing modes linked to Mie resonances.

High refractive index dielectrics lower lasing threshold.

Established a general lasing threshold condition.

Abstract

We demonstrate theoretically that a subwavelength spherical dielectric nanoparticle coated with a gain shell forms a nanolaser. Lasing modes of such a nanolaser are associated with the Mie resonances of the nanoparticle. We establish a general condition for the lasing threshold and show that the use of high refractive index dielectric media allows for lasing with a threshold significantly lower than that for nanolasers incorporating lossy plasmonic metals.