Finite-Difference Time-Domain (FDTD) design of gold nanoparticle chains with specific surface plasmon resonance

[Display omitted] •FDTD analysis of plasmonic properties of chain like assembly of GNPs.•Empirical formula for LSPR band of chain like assembly of GNPs.•Useful rules for designing highly effective SERS-active substrates. We employ Finite-Difference Time-Domain (FDTD) simulations to analyze the elect...

Full description

Saved in:
Bibliographic Details
Published in:Journal of molecular structure 2014-08, Vol.1072, p.137-143
Main Authors: Tira, Cristian, Tira, Daniela, Simon, Timea, Astilean, Simion
Format: Article
Language:English
Subjects:
FDTD
Finite difference method
Finite difference time domain method
Gold
Gold nanoparticles
LSPR
Mathematical analysis
Molecular structure
Plasmons
Raman scattering
SERS
Specific surface
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:[Display omitted] •FDTD analysis of plasmonic properties of chain like assembly of GNPs.•Empirical formula for LSPR band of chain like assembly of GNPs.•Useful rules for designing highly effective SERS-active substrates. We employ Finite-Difference Time-Domain (FDTD) simulations to analyze the electromagnetic far- and near-field response of gold nanoparticles (NPs) organized in chain-like structures as function of the number of particles and inter-particle distance in structures. As a result an empirical formula to predict the position of collective localized surface plasmon resonance (LSPR) as function of number of particles in the chain is devised. On the other hand the experimental LSPR spectrum recorded from a colloidal solution exhibiting a certain degree of aggregation has been effectively reconstructed by linear combination of individual LSPR contribution as calculated for NP ensembles of different size (monomers, dimers, trimers, etc.). Notably, we find that the maximum of electric field intensity (E2) in between adjacent NPs increases from dimeric to trimeric and tetrameric ensembles, followed by a steady state decrease as the number of NPs per chain further increases. The central gap in a long chain of NPs accommodate the highest field enhancement (‘hot-spots’). Our findings are relevant for designing effective substrates for Surface-Enhanced Raman Scattering (SERS) and plasmonic waveguides.
ISSN:0022-2860
1872-8014
DOI:10.1016/j.molstruc.2014.04.086