Open AccessNegative asymmetry parameter in plasmonic core-shell nanoparticles
Author(s) -
Paris Varytis,
Kurt Busch
Publication year - 2020
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.380181
Subject(s) - plasmon , materials science , asymmetry , surface plasmon polariton , surface plasmon , optics , shell (structure) , scattering , dielectric , light scattering , nanoparticle , plasmonic nanoparticles , localized surface plasmon , core (optical fiber) , extinction (optical mineralogy) , mean free path , molecular physics , optoelectronics , physics , nanotechnology , quantum mechanics , composite material
Plasmonic nanoparticles with a dielectric-metal core-shell morphology exhibit hybridized modes where the surface plasmon polaritons at the outer and inner surfaces of the shell couple. We demonstrate that suitably tailoring the interference of such hybrid surface plasmon polariton modes leads to composite subwavelength nanospheres with negative asymmetry parameters and strong scattering in the optical frequency range. As a result, for a low density collection of scatterers an anomalous regime occurs, where the extinction mean free path is longer than the transport mean free path. Explicit results for silver-coated nanospheres are presented.