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dc.contributor.author
Scarpettini, Alberto Franco
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dc.contributor.author
Bragas, Andrea Veronica
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dc.date.available
2017-06-21T20:40:38Z
dc.date.issued
2015-01
dc.identifier.citation
Scarpettini, Alberto Franco; Bragas, Andrea Veronica; Harmonic demodulation and minimum enhancement factors in field-enhanced near-field optical microscopy; Wiley Blackwell Publishing, Inc; Journal Of Microscopy-oxford; 257; 1-2015; 54-64
dc.identifier.issn
0022-2720
dc.identifier.uri
http://hdl.handle.net/11336/18592
dc.description.abstract
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.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Wiley Blackwell Publishing, Inc
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Enhancement Factor
dc.subject
Harmonic Demodulation
dc.subject
Scanning Near-Field Optical Microscopy
dc.subject.classification
Óptica
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dc.subject.classification
Ciencias Físicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Harmonic demodulation and minimum enhancement factors in field-enhanced near-field optical microscopy
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-06-12T20:03:18Z
dc.journal.volume
257
dc.journal.pagination
54-64
dc.journal.pais
Reino Unido
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dc.journal.ciudad
Londres
dc.description.fil
Fil: Scarpettini, Alberto Franco. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Física. Laboratorio de Electrónica Cuántica; Argentina
dc.description.fil
Fil: Bragas, Andrea Veronica. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Física de Buenos Aires; Argentina
dc.journal.title
Journal Of Microscopy-oxford
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/ark/http://onlinelibrary.wiley.com/doi/10.1111/jmi.12185/abstract
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/ark/http://dx.doi.org/10.1111/jmi.12185
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