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Abstract:

Recently, using field enhanced scanning optical microscopy (FESOM), a new kind of plasmonic nanostructured probes has been introduced capable to achieve subnanometric vertical resolution on atomically flat samples. These plasmonic probes consisting in silica (SiO2) microspheres decorated with 5 nm diameter spherical Ag nanoparticles (NPs) exhibit a multiple peaked experimental extinction spectra in colloidal dispersion. The subnanometric resolution achieved in FESOM is observed when they are attached to a metal tip and illuminated at 632 nm. On the contrary, these probes lack of resolution in FESOM measurements upon 532 nm laser light illumination. In this work, the complex extinction properties of these probes as well as their near field optical properties are compared and analyzed by means of rigorous electrodynamic simulations. The calculations show that the far and near field optical behavior can only be explained in a consistent way in terms of the plasmonic response of small Ag NPs clusters on the silica surface. Using these cluster configurations, the near field simulations of the optical response are also found to be in excellent agreement with the experimental FESOM approach curves, demonstrating in this way the subnanometric resolution achieved at 632 nm and the almost null response at 532 nm. © 2011 American Chemical Society.

Registro:

Documento: Artículo
Título:Understanding the behavior of new plasmonic probes with sub-nanometric resolution in field enhanced scanning optical microscopy
Autor:Perassi, E.M.; Scarpettini, A.F.; Masip, M.E.; Bragas, A.V.; Coronado, E.A.
Filiación:INFIQC, Dpto. de Fisicoquímica, Universidad Nacional de Córdoba, Suc. 16, C.C. 61, 5016, Córdoba, Argentina
Laboratorio de Electrónica Cuántica, Departamento de Física, Universidad de Buenos Aires, Pabellón 1, 1428 Buenos Aires, Argentina
IFIBA, Consejo Nacional de Investigaciones Científicas y Tecnológicas, CONICET, Argentina
Palabras clave:532 nm laser; Ag nanoparticle; Approach curve; Cluster configurations; Colloidal dispersion; Electrodynamic simulations; Extinction spectra; In-field; Metal tip; Nano-structured; Near fields; Near-field simulation; Optical behavior; Optical response; Plasmonic; Plasmonic response; Scanning optical microscopy; Silica surface; Vertical resolution; Optical data storage; Optical instruments; Optical microscopy; Plasmons; Probes; Silica; Silicon compounds; Silver; Optical properties
Año:2011
Volumen:115
Número:21
Página de inicio:10455
Página de fin:10461
DOI: http://dx.doi.org/10.1021/jp201717f
Título revista:Journal of Physical Chemistry C
Título revista abreviado:J. Phys. Chem. C
ISSN:19327447
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_19327447_v115_n21_p10455_Perassi

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Citas:

---------- APA ----------
Perassi, E.M., Scarpettini, A.F., Masip, M.E., Bragas, A.V. & Coronado, E.A. (2011) . Understanding the behavior of new plasmonic probes with sub-nanometric resolution in field enhanced scanning optical microscopy. Journal of Physical Chemistry C, 115(21), 10455-10461.
http://dx.doi.org/10.1021/jp201717f
---------- CHICAGO ----------
Perassi, E.M., Scarpettini, A.F., Masip, M.E., Bragas, A.V., Coronado, E.A. "Understanding the behavior of new plasmonic probes with sub-nanometric resolution in field enhanced scanning optical microscopy" . Journal of Physical Chemistry C 115, no. 21 (2011) : 10455-10461.
http://dx.doi.org/10.1021/jp201717f
---------- MLA ----------
Perassi, E.M., Scarpettini, A.F., Masip, M.E., Bragas, A.V., Coronado, E.A. "Understanding the behavior of new plasmonic probes with sub-nanometric resolution in field enhanced scanning optical microscopy" . Journal of Physical Chemistry C, vol. 115, no. 21, 2011, pp. 10455-10461.
http://dx.doi.org/10.1021/jp201717f
---------- VANCOUVER ----------
Perassi, E.M., Scarpettini, A.F., Masip, M.E., Bragas, A.V., Coronado, E.A. Understanding the behavior of new plasmonic probes with sub-nanometric resolution in field enhanced scanning optical microscopy. J. Phys. Chem. C. 2011;115(21):10455-10461.
http://dx.doi.org/10.1021/jp201717f