Open AccessVortex energy flows generated by core-shell nanospheres
Author(s) -
Shih-Wen Chen,
Jia-Han Li
Publication year - 2017
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.25.008950
Subject(s) - nanoshell , cladding (metalworking) , vortex , dielectric , optics , materials science , optical vortex , core (optical fiber) , scattering , shell (structure) , light scattering , radius , molecular physics , condensed matter physics , plasmon , physics , optoelectronics , mechanics , composite material , computer security , computer science
Investigated in this paper is the interaction of light and the nanospheres composed by a dielectric core with a gold-shell cladding that causes the optical vortices inside the core and the whirlpools around the shell. Different radius ratios, dimensions and the dielectric functions of nanospheres were studied using the finite-difference time-domain method. It was found that optical vortices were most likely to occur in the regions of increased absorption cross section and reduced scattering cross section. Two optical vortices of the opposite polarity, each centered in one of the particles of a dimer are created by a nanoshell dimer. The surrounding media of a nanoshell with different dielectric functions can be used to affect the energy flows generated by core-shell nanospheres.