Harmonic demodulation and minimum enhancement factors in field-enhanced near-field optical microscopy

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Field enhanced scanning optical microscopy (FESOM) relies on the design and fabrication of plasmonic probes which had to provide optical and chemical contrast at the nanoscale. In order to do so, the scattering containing the near field information recorded in a FESOM experiment, has to surpass the...

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Detalles Bibliográficos
Autores principales: Scarpettini, Alberto, Bragas, Andrea Veronica
Formato: Artículo publishedVersion
Lenguaje:Inglés
Publicado: 2019
Materias:
UTN
FRD
FESOM
scanning optical microscopy
Plasmonic
harmonic demodulation
Acceso en línea:http://hdl.handle.net/20.500.12272/3752
Aporte de:
RIA - Repositorio Institucional Abierto (UTN) de Universidad Tecnológica Nacional
id I68-R174-20.500.12272-3752
record_format dspace
institution Universidad Tecnológica Nacional
institution_str I-68
repository_str R-174
collection RIA - Repositorio Institucional Abierto (UTN)
language Inglés
topic UTN
FRD
FESOM
scanning optical microscopy
Plasmonic
harmonic demodulation
spellingShingle UTN
FRD
FESOM
scanning optical microscopy
Plasmonic
harmonic demodulation
Scarpettini, Alberto
Bragas, Andrea Veronica
Harmonic demodulation and minimum enhancement factors in field-enhanced near-field optical microscopy
topic_facet UTN
FRD
FESOM
scanning optical microscopy
Plasmonic
harmonic demodulation
description Field enhanced scanning optical microscopy (FESOM) relies on the design and fabrication of plasmonic probes which had to provide optical and chemical contrast at the nanoscale. In order to do so, the scattering containing the near field information recorded in a FESOM experiment, has to surpass the background light, always present due multiple interferences between the macroscopic probe and sample. In this work, we show that when the probe-sample distance is modulated with very low amplitude, the higher the harmonic demodulation is, the better the ratio between the near field signal and the interferometric background results. The choice of working at a given n harmonic is dictated by the experiment when the signal at the n+1 harmonic goes below the experimental noise. We demonstrate that the optical contrast comes from the nth-derivative of the near field scattering, amplified by the interferometric background. By modeling the far and near field we calculate the probe-sample approach curves, which fit very well the experimental ones. After taking a great amount of experimental data for different probes and samples, we conclude with a table of the minimum enhancement factors needed to have optical contrast with FESOM.
format Artículo
publishedVersion
Artículo
author Scarpettini, Alberto
Bragas, Andrea Veronica
author_facet Scarpettini, Alberto
Bragas, Andrea Veronica
author_sort Scarpettini, Alberto
title Harmonic demodulation and minimum enhancement factors in field-enhanced near-field optical microscopy
title_short Harmonic demodulation and minimum enhancement factors in field-enhanced near-field optical microscopy
title_full Harmonic demodulation and minimum enhancement factors in field-enhanced near-field optical microscopy
title_fullStr Harmonic demodulation and minimum enhancement factors in field-enhanced near-field optical microscopy
title_full_unstemmed Harmonic demodulation and minimum enhancement factors in field-enhanced near-field optical microscopy
title_sort harmonic demodulation and minimum enhancement factors in field-enhanced near-field optical microscopy
publishDate 2019
url http://hdl.handle.net/20.500.12272/3752
work_keys_str_mv AT scarpettinialberto harmonicdemodulationandminimumenhancementfactorsinfieldenhancednearfieldopticalmicroscopy
AT bragasandreaveronica harmonicdemodulationandminimumenhancementfactorsinfieldenhancednearfieldopticalmicroscopy
bdutipo_str Repositorios
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