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Issue 5, 2015
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Surface-enhanced spectroscopy on plasmonic oligomers assembled by AFM nanoxerography

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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

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Publication details

The article was received on 02 Sep 2014, accepted on 21 Nov 2014 and first published on 03 Dec 2014


Article type: Paper
DOI: 10.1039/C4NR05092D
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Citation: Nanoscale, 2015,7, 2009-2022
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    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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