Issue 5, 2015

Surface-enhanced spectroscopy on plasmonic oligomers assembled by AFM nanoxerography

Abstract

Surface-enhanced Raman scattering (SERS) and surface-enhanced fluorescence (SEF) from individual plasmonic oligomers are investigated by confocal Raman micro-spectroscopy and time-resolved fluorescence microscopy coupled to steady state micro-spectroscopy. The nanoparticle (NP) oligomers are made of either ligand protected Au or Au@SiO2 core–shell colloidal NPs, which were assembled into ordered arrays by atomic force microscopy (AFM) nanoxerography. A strong dependence of the SERS emission on the polarization of incident light relative to the specific geometry of the plasmonic oligomer was observed. The SEF studies, performed on a large collection of NP oligomers of various known configurations showed interesting fluorophore decay rate modification and red-shift of the emission spectra. The experimental results are analyzed theoretically by employing finite-difference time-domain (FDTD) simulations on equivalent realistic structures, within the local density of optical states (LDOS) framework. The presented results, together with the proven potential of the LDOS approach as a useful common tool for analyzing both SERS and SEF effects further the general understanding of plasmon-related phenomena in nanoparticle oligomers.

Graphical abstract: Surface-enhanced spectroscopy on plasmonic oligomers assembled by AFM nanoxerography

Supplementary files

Article information

Article type
Paper
Submitted
02 Sep 2014
Accepted
21 Nov 2014
First published
03 Dec 2014

Nanoscale, 2015,7, 2009-2022

Author version available

Surface-enhanced spectroscopy on plasmonic oligomers assembled by AFM nanoxerography

P. Moutet, N. M. Sangeetha, L. Ressier, N. Vilar-Vidal, M. Comesaña-Hermo, S. Ravaine, R. A. L. Vallée, A. M. Gabudean, S. Astilean and C. Farcau, Nanoscale, 2015, 7, 2009 DOI: 10.1039/C4NR05092D

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