Understanding the Behavior of New Plasmonic Probes with Sub-Nanometric Resolution in Field Enhanced Scanning Optical Microscopy

Perassi, Eduardo Marcelo; Scarpettini, Alberto F.; Masip, Martín E.; Bragas, Andrea V.; Coronado, Eduardo A.

doi:10.1021/jp201717f

Cited by 4 publications

(8 citation statements)

References 32 publications

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“…Among these remarkable optical properties, large electromagnetic field enhancements (Γ) around the NPs stand out by their applications. Many studies have demonstrated that Γ between two spherical NPs can be orders of magnitude higher than the values of Γ around a single spherical NP during a plasmon resonance. − …”

Section: Introductionmentioning

confidence: 99%

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The Structure, Energy, Confinement, and Enhancement of Hot Spots between Two Nanoparticles

Perassi

Coronado

2013

J. Phys. Chem. C

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Hot spots (HSs) between two nanoparticles (NPs) can be considered the canonical example of plasmonic coupling effects and are able to achieve huge enhancements of signals from molecules in fluorescence and Raman spectroscopy. In this work, it is found that these HSs between two NPs can be modeled as a superposition of sub-HSs that are located on the surface of each NP of the pair, a fact that can be important to describe plasmon coupling effects. The analyzed HSs are almost fully characterized by means of their energy, degree of localization, and mean enhancement, quantities that are able to give a measure of their performance. It is demonstrated that the interplay between the energy and degree of localization is what actually determines the enhancement in a general way, that is, HSs with similar energy could have a large/small enhancement depending on their degree of localization.

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Section: Introductionmentioning

confidence: 99%

“…In addition, these enhanced fields are also relevant in other applications such as nanolithography, − tips for SNOM (scanning near-field optical microscopy) , and FESOM (field-enhanced scanning optical microscopy), biosensors, − chemical sensors, and so forth.…”

Section: Introductionmentioning

confidence: 99%

The Structure, Energy, Confinement, and Enhancement of Hot Spots between Two Nanoparticles

Perassi

Coronado

2013

J. Phys. Chem. C

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“…Es importante obtener control sobre el grado de recubrimiento de un sustrato con nanopartículas y sobre có-mo se agregan en dímeros, trímeros o grupos mayores porque las resonancias plasmónicas, y por consiguiente sus propiedades ópticas, dependen fuertemente del número de nanopartículas presentes y de las interacciones entre ellas [12,13]. Una de las formas de realizar estos recubrimientos es a través de la evaporación del solvente, pero este método no permite recubrir homogéneamente el sustrato y es muy difícil llevar a cabo recubrimientos en áreas extensas [14,15].…”

Section: Introductionunclassified

Recubrimiento controlado de sustratosde vidrio con nanobastones metálicos

2015

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RESUMENSe realizó la síntesis de nanobastones de oro monodispersos con una eficiencia superior al 80% sobre el total de nanopartículas, caracterizado por una resonancia plasmónica longitudinal cercana a los 800 nm. Se modificaron superficialmente sustratos de vidrio y se los recubrió con los nanobastones sintetizados, con control de la densidad superficial. Se monitoreó la dinámica del recubrimiento a través de espectros de extinción, y se observó una densidad máxima de saturación dada por repulsión electrostática y un tiempo característico del proceso. Luego de alcanzada la saturación de nanobastones por unidad de área se observa un ensanchamiento de las resonancias hacia el infrarrojo, debido a interacciones entre los nanobastones por producirse agregaciones sobre la superficie. Estos resultados tienen aplicación inmediata en el diseño y fabricación de dispositivos plasmónicos, por ejemplo en el sensado molecular.Palabras clave: Nanobastones de oro, Plasmónica, Sustratos nanoestructurados. ABSTRACTMonodispersed gold nanorods were synthesized with efficiency above 80% of all nanoparticles, characterized by longitudinal plasmon resonance around 800 nm. Glass substrates were surface modified and covered with the synthesized nanorods with control of surface density. Coverage dynamics was monitored through extinction spectra, and a saturation maximum density was observed, given by electrostatic repulsion, and a characteristic time of the process. A widening of the resonance towards the infrared is observed after reaching the saturation of nanorods per unit area, due to interactions between nanorods on account of surface aggregation. These results have immediate application in the design and manufacture of plasmonic devices, for example in molecular sensing.Keywords: Gold nanorods, Plasmonics, Nanostructured substrates. INTRODUCCIÓNUno de los objetivos de la plasmónica es el control preciso de las propiedades ópticas de la materia nanoestructurada con el fin de lograr, por ejemplo, sensores eficientes y sensibles [1,2], fuentes de luz ultra compactas [3], espectroscopías de moléculas individuales [4,5], terapias fototérmicas contra el cáncer [6,7], microscopías ópticas de resolución nanométrica [8,9], celdas solares [10], entre otras aplicaciones. Para lograr esto es indispensable el diseño a medida de nanoestructuras, su fabricación con alta eficiencia y repetitividad, y el control preciso de sus formas y dimensiones.En esta línea, los nanobastones de oro (NBOs) son atractivos por su simplicidad y porque poseen resonancias plasmónicas superficiales en el rango visible e infrarrojo del espectro electromagnético. La longitud de onda de estas resonancias depende, entre otros factores, de las dimensiones de los NBOs. Si se tiene control sobre su relación de aspecto se puede sintonizar una resonancia relativamente angosta [11]. De este modo es posible construir un dispositivo plasmónico resonante a una longitud de onda deseada, sintetizando NBOs de dimensiones adecuadas y fabricando una nanoestructura usando los NBOs co...

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“…In particular, they play a crucial role in the development and optimal design of ultrasensitive spectroscopies including surface-enhanced Raman spectroscopy (SERS), 1À10 single-molecule SERS, 11À16 tip-enhanced Raman spectroscopy, 17À23 surface-enhanced fluorescence, 24À27 as well as in the detection of chemical and biological agents, 28À32 in nanolithography, 33À36 and in the rational design of tips for scanning near-field optical microscopy 37À39 and fieldenhanced scanning optical microscopy. 40 The remarkable optical properties of noble metal NPs are dominated by the excitation of localized surface plasmon resonances (LSPRs). LSPRs originate from collective oscillations of the conduction band electrons in a NP and are extremely sensitive to the exact shape, size, composition of the NP, and the surrounding medium.…”

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confidence: 99%

“…Currently, there is significant scientific and technological interest in the optical properties of noble metal nanoparticles (NPs). In particular, they play a crucial role in the development and optimal design of ultrasensitive spectroscopies including surface-enhanced Raman spectroscopy (SERS), − single-molecule SERS, − tip-enhanced Raman spectroscopy, − surface-enhanced fluorescence, − as well as in the detection of chemical and biological agents, − in nanolithography, − and in the rational design of tips for scanning near-field optical microscopy − and field-enhanced scanning optical microscopy …”

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Quantitative Understanding of the Optical Properties of a Single, Complex-Shaped Gold Nanoparticle from Experiment and Theory

et al. 2014

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We report on a combined study of Rayleigh and Raman scattering spectroscopy, 3D electron tomography, and discrete dipole approximation (DDA) calculations of a single, complex-shaped gold nanoparticle (NP). Using the exact reconstructed 3D morphology of the NP as input for the DDA calculations, the experimental results can be reproduced with unprecedented precision and detail. We find that not only the exact NP morphology but also the surroundings including the points of contact with the substrate are of crucial importance for a correct prediction of the NP optical properties. The achieved accuracy of the calculations allows determining how many of the adsorbed molecules have a major contribution to the Raman signal, a fact that has important implications for analyzing experiments and designing sensing applications.

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Understanding the Behavior of New Plasmonic Probes with Sub-Nanometric Resolution in Field Enhanced Scanning Optical Microscopy

Cited by 4 publications

References 32 publications

The Structure, Energy, Confinement, and Enhancement of Hot Spots between Two Nanoparticles

The Structure, Energy, Confinement, and Enhancement of Hot Spots between Two Nanoparticles

Recubrimiento controlado de sustratosde vidrio con nanobastones metálicos

Quantitative Understanding of the Optical Properties of a Single, Complex-Shaped Gold Nanoparticle from Experiment and Theory

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