Spaser based on Fano resonance in a rod and concentric square ring-disk nanostructure

Abstract

This paper reports a spaser based on Fano resonance of a plasmonic nanostructure consisting of a rod and concentric square ring-disk structure coated with a layer of gain media. The amplification of the dark quadrupolar mode at the Fano resonance wavelength causes the spaser with a high Purcell factor of 3.24 × 107, a high signal to noise ratio of 4.4 × 106, and a lower threshold of 0.02086. These significant optical properties are attributed to the greatly enhanced spontaneous emission and depressed radiation loss supported by the strong localized dark mode at the Fano resonance wavelength.

Thermally tunable fano resonance of a conductive rubber‐based metamaterial

“…This phenomenon is characterized by an asymmetrical scattering versus energy (or frequency) behavior. The high quality factor Q and spectral contrast of Fano resonances make them ideally suited for use in many applications where steep dispersions are essential, such as in slow light, biosensors, filters, surface enhanced Raman scattering, and surface plasmon lasers …”

A molecular plasmonic Fano-router: Using hotspots in a single-stone ring-like structure

“…In searching for new structures with simple geometries to support strong plasmon resonances and their constructive and destructive interference, newly, some new structures have been proposed to boost and enhance the energy of dark plasmon resonant modes that can be utilized in producing strong hotspots. Fractal nanoparticles in different Cayley tree orientation [18] and four-sided squares with a broken side [19] are the most recent examples of these nanostructures that were tailored to support strong Fano resonances at the optical frequencies. Although these irregular structures reflect remarkable optical responses, the plasmon response of spherical nanostructures are more promising and reliable for practical purposes.…”

Efficient surface plasmon amplification in gain-assisted silver nanotubes and associated dimers

“…A Fano resonance-based SPASER was found in a rod and concentric square ring-disk nanostructure. 28 We also proposed a dual-frequency SPASER based on the gainassisted metallic nanomatryushkas. 29 However, the SPASER properties in metal nanotubes were seldom reported, especially in their dimers.…”