Synergetic Light-Harvesting and Near-Field Enhancement in Multiscale Patterned Gold Substrates

Sphere-segment void (SSV) cavities have emerged as promising substrates for reproducible Surface Enhanced Raman Scattering (SERS), offering strong and uniform electromagnetic enhancement associated with the excitation of cavity-like localized surface plasmon resonances tunable across the UV–vis-near...

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Detalles Bibliográficos
Autores principales: Hernandez, Luis Alfonso Guerra, Millone, María Antonieta Daza, Cortés, Emiliano, Castez, Marcos Federico, Auguié, Baptiste, Vela, María Elena, Salvarezza, Roberto Carlos, Fainstein, Alejandro
Formato: Articulo
Lenguaje:Inglés
Publicado: 2015
Materias:
Química
Física
Ciencias Exactas
Plasmonic substrates
Sphere-segment void arrays
Roughness
Multiscale antennas
Surface Enhanced Raman Spectroscopies
Sensing
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/140853
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-140853
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Química
Física
Ciencias Exactas
Plasmonic substrates
Sphere-segment void arrays
Roughness
Multiscale antennas
Surface Enhanced Raman Spectroscopies
Sensing
spellingShingle Química
Física
Ciencias Exactas
Plasmonic substrates
Sphere-segment void arrays
Roughness
Multiscale antennas
Surface Enhanced Raman Spectroscopies
Sensing
Hernandez, Luis Alfonso Guerra
Millone, María Antonieta Daza
Cortés, Emiliano
Castez, Marcos Federico
Auguié, Baptiste
Vela, María Elena
Salvarezza, Roberto Carlos
Fainstein, Alejandro
Synergetic Light-Harvesting and Near-Field Enhancement in Multiscale Patterned Gold Substrates
topic_facet Química
Física
Ciencias Exactas
Plasmonic substrates
Sphere-segment void arrays
Roughness
Multiscale antennas
Surface Enhanced Raman Spectroscopies
Sensing
description Sphere-segment void (SSV) cavities have emerged as promising substrates for reproducible Surface Enhanced Raman Scattering (SERS), offering strong and uniform electromagnetic enhancement associated with the excitation of cavity-like localized surface plasmon resonances tunable across the UV–vis-near IR range, with a facile large-scale fabrication process. High-resolution electron micrographs of these structures reveal a considerable departure from the idealized smooth spherical cavity shape; notably, the electrochemical deposition of gold yields an important surface roughness. We investigate this contribution to the SERS activity of SSV substrates with a series of experiments, varying the degree of surface roughness using thermal annealing and gradual electrochemical roughening. Notably, we observe that both roughness features and cavity-like modes operate in conjunction as a multiscale antenna to provide larger SERS efficiency than the two mechanisms considered separately. We conclude that the main role of the ordered cavity structure is to increase the plasmonic mode density near rough surface features, thus optimizing the coupling of far-field radiation (light harvesting) to locally enhanced near fields.
format Articulo
Articulo
author Hernandez, Luis Alfonso Guerra
Millone, María Antonieta Daza
Cortés, Emiliano
Castez, Marcos Federico
Auguié, Baptiste
Vela, María Elena
Salvarezza, Roberto Carlos
Fainstein, Alejandro
author_facet Hernandez, Luis Alfonso Guerra
Millone, María Antonieta Daza
Cortés, Emiliano
Castez, Marcos Federico
Auguié, Baptiste
Vela, María Elena
Salvarezza, Roberto Carlos
Fainstein, Alejandro
author_sort Hernandez, Luis Alfonso Guerra
title Synergetic Light-Harvesting and Near-Field Enhancement in Multiscale Patterned Gold Substrates
title_short Synergetic Light-Harvesting and Near-Field Enhancement in Multiscale Patterned Gold Substrates
title_full Synergetic Light-Harvesting and Near-Field Enhancement in Multiscale Patterned Gold Substrates
title_fullStr Synergetic Light-Harvesting and Near-Field Enhancement in Multiscale Patterned Gold Substrates
title_full_unstemmed Synergetic Light-Harvesting and Near-Field Enhancement in Multiscale Patterned Gold Substrates
title_sort synergetic light-harvesting and near-field enhancement in multiscale patterned gold substrates
publishDate 2015
url http://sedici.unlp.edu.ar/handle/10915/140853
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