Authors
Montacer Dridi, Alexandre Vial,
Title
FDTD Modeling of Gold Nanoparticle Pairs in a Nematic Liquid Crystal Cell
In
J. Phys. D: Appl. Phys.
Volume
43
Issue
41
Pages
415102
Publisher
IOP
Year
2010
Publisher's URL
http://dx.doi.org/10.1088/0022-3727/43/41/415102
Indexed by
Abstract
In this paper, we numerically investigate a grating of gold dimer in a nematic liquid crystal (LC) media. We show that the plasmon resonance exhibits a high sensitivity to the distance between nanoparticles for all orientations of molecules of LCs. The behaviour of plasmon resonance can be described by a simple function called compressed hyperbola that overcomes the limitation of describing this behaviour by the well-known exponential function. Also we show that the orientation of the optical axis leads to an important spectral tunability. We demonstrate then that for certain orientations of the optical axis, we can induce a diffraction coupling featuring an additional narrow resonance peak. Finally near-field properties of the structure are investigated, and we demonstrate that by rotating the director we can control the local field enhancement.
Affiliations
Offprint