Arbitrary tunable spaser based on double-Fano resonance of two sets of disk-ring nanostructure

TL;DR

This paper introduces a tunable spaser using a double-Fano resonance in a disk-ring nanostructure, enabling broad wavelength control of lasing and pumping modes for advanced nanophotonic applications.

Contribution

It presents a novel nanostructure design supporting dual Fano resonances for independently tunable lasing and pumping modes over a wide spectral range.

Findings

Lasing mode tunable over 710 nm

Pumping mode tunable over 620 nm

Supports arbitrary wavelength tuning for spasers

Abstract

This paper demonstrates an arbitrary tunable spaser based on double-Fano resonance of a plasmonic nanostructure consisting of two sets of disk-ring (TSDR) nanostructure. TSDR nanostructure supports two Fano resonances, which can be served as the lasing mode and the pumping mode of a spaser. These two mode can be tuned in a very wide wavelength range because of the good tunability of the two nanorings. The tuning range of the lasing mode and the pumping mode can be reached to 710 nm and 620 nm. These results represent a significant step in the pursuit of ultimate spasers and propose a approach to manipulate lasing mode and pumping mode over a broad spectral range.