Gain-driven singular resonances in active core-shell and nano-shell plasmonic particles
Langue
EN
Article de revue
Ce document a été publié dans
Journal of the Optical Society of America B. 2022, vol. 39, n° 1, p. 107
Résumé en anglais
Within the frame of a simple, long-wavelength, quasi-static description, we present a theoretical characterization of the optical response of metal nanoparticles doped with active gain elements in a core-shell (metallic ...Lire la suite >
Within the frame of a simple, long-wavelength, quasi-static description, we present a theoretical characterization of the optical response of metal nanoparticles doped with active gain elements in a core-shell (metallic core within an active dielectric shell) and nano-shell (active dielectric core within a metallic shell) configurations. The common feature of these structures is that, adding gain to the system produces an increase of the quality of the plasmon resonance, which becomes sharper and sharper until a singular point, after which, the system switches from absorptive to emissive (nanolaser). We use this aforementioned simple model to develop a general method allowing us to calculate both the expected singular plasmon frequency and the gain level needed to realize it and to discuss the spectral deformation occurring before and after this singular point. Finally, we propose a way to calculate if the singular behavior is reachable using realistic amounts of gain.< Réduire
Mots clés en anglais
Invisibility cloaks
Mie theory
Optical Bloch equations
Optical fields
Resonance
Resonance enhancement