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| Content Provider | Royal Society of Chemistry (RSC) |
|---|---|
| Author | Vilar-Vidal, Noelia Sangeetha, Neralagatta M. Gabudean, Ana Maria Ravaine, Serge Moutet, Pierre Vallée, Renaud A. L. Astilean, Simion Ressier, Laurence Comesaña-Hermo, Miguel Farcau, Cosmin |
| Copyright Year | 2015 |
| 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. |
| Starting Page | 2009 |
| Ending Page | 2022 |
| Page Count | 14 |
| File Format | HTM / HTML PDF |
| ISSN | 20403364 |
| Volume Number | 7 |
| Issue Number | 5 |
| Journal | Nanoscale |
| DOI | 10.1039/c4nr05092d |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Access Restriction | Open |
| Subject Keyword | Finite-difference time-domain method NP Nanoparticle Ligand Fluorescence Oligomer Redshift Molecular geometry Microscopy Atomic-force microscopy Fluorophore SEF spectroscopy Raman scattering Finite difference Raman Correlation and dependence LDOS |
| Content Type | Text |
| Resource Type | Article |
| Subject | Nanoscience and Nanotechnology |
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