Open AccessControlling near-field polarization distribution of a plasmonic prolate nanospheroid by its aspect ratio and polarization of the incident electromagnetic field
Author(s) -
Eugeny D. Chubchev,
Yu. V. Vladimirova,
Victor N. Zadkov
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.020432
Subject(s) - polarization (electrochemistry) , plasmon , optics , prolate spheroid , ray , electromagnetic field , stokes parameters , aspect ratio (aeronautics) , physics , near and far field , materials science , optoelectronics , scattering , classical mechanics , chemistry , quantum mechanics
Near-field polarization distribution of a plasmonic prolate nanospheroid in an incident electromagnetic field versus its polarization and the spheroid's aspect ratio is studied in detail. Polarization of the near-field is described with the help of the 3D generalized Stokes parameters, allowing simple visualization. It is shown that this distribution has a complex structure, which drastically depends on the incident field polarization and parameters of the plasmon resonance of the nanoparticle. Received analytical solutions cover the whole set of particles with shape varying from spherical to the nanoneedles and nanorods by changing the aspect ratio of the spheroid. An experiment for visualization of the vectorial near-field around a plasmonic nanoparticle is proposed.