Open AccessEnhanced surface plasmon resonance based on the silver nanoshells connected by the nanobars
Author(s) -
Yuan-Fong Chou Chau,
Yi-Ju Lin,
Din Ping Tsai
Publication year - 2010
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.18.003510
Subject(s) - materials science , nanoshell , surface plasmon resonance , surface plasmon , dielectric , optics , localized surface plasmon , plasmon , scattering , silver nanoparticle , polarization (electrochemistry) , excitation , surface plasmon polariton , wavelength , light scattering , optoelectronics , nanoparticle , nanotechnology , physics , chemistry , quantum mechanics
Enhanced surface plasmon resonances in a silvershell nanocylindrical pair connected by a different type of nanobar that interacts with incident plane wave of transverse magnetic polarization are simulated by use of the finite element method. Arrays of silver nanoshells connected by silver nanobars are also investigated. The proposed structure exhibits a red-shifted localized surface plasmon that can be tuned over an extended wavelength range by varying the width of the nanobar and the dielectric constant in dielectric holes (DHs). The increase in the scattering cross sections is attributed to the effects of surface plasmon on the nanobar surface and a larger effective size of DH that is filled with a higher refractive medium. The predictive character of these calculations allows one to tailor the shape of the nanoparticle to achieve excitation spectra on demand with a controlled field enhancement.