Spectroscopy on Single Metallic Nanoparticles Using Subwavelength Apertures

Jahr, Norbert; Anwar, Mamuna; Stránik, Ondrej; Hädrich, Nicole; Vogler, Nadine; Csáki, Andrea; Popp, Jürgen; Fritzsche, Wolfgang

doi:10.1021/jp311135g

Cited by 10 publications

(9 citation statements)

References 24 publications

(26 reference statements)

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“…Using nanoholes, the disturbing background light is masked and so single particles can be studied more directly without the need for sophisticated setups. This was the motivation to develop a straightforward detection for individual plasmonic nanoparticle labels [67]. This principle was demonstrated for gold nanoparticles in sub-wavelength holes in a chromium layer on glass.…”

Section: Nanoholes In Other Materialsmentioning

confidence: 99%

“…In order to reveal the number of particles in a studied chromium film nanohole, the spectral properties of hole-particle hybrid systems were studied [68]. A full 3D calculation of the light transmission through a single hole (empty or with a particle) based on a generalized multipole technique yielded differences between both spectra (Figure 2.10a), which are also visible in the experimental data normalized to the light source (b).…”

Section: Nanoholes In Other Materialsmentioning

confidence: 99%

“…They have been tested using DNA assays where DNA 20mers (complementary to the analyte DNA) was attached to gold nanoparticles using thiol-modified DNA, and acted as capture molecule when analyte was present (Figure 2.11) [67]. They have been tested using DNA assays where DNA 20mers (complementary to the analyte DNA) was attached to gold nanoparticles using thiol-modified DNA, and acted as capture molecule when analyte was present (Figure 2.11) [67].…”

Section: Nanoholes In Other Materialsmentioning

confidence: 99%

“…Simulation and measurements of the ratio of a CCD red signal to its sum signal for hybrid systems of chromium nanoholes with and without gold nanoparticles inside [67]. Reproduced with permission.…”

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confidence: 99%

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Plasmonic Effects

2014

Molecular Plasmonics

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The plasmon is a quasiparticle that is related, on the one hand, to the electronic properties of the metal, since it is considered a collective oscillation of the free electrons inside the metal or at the interface between a metal and a dielectric material, and, on the other hand, to the optical properties of the metal since the plasmon can be excited by the interaction with a photon. In order to understand the plasmon and its characteristics, it is important to consider both properties and their relationship. Thus, we will first start with the description of such properties and then present the different types of plasmon and their properties. Electrical Conductivity in MetalFree electrons inside a metal essentially govern the electrical conductivity, and the large values reached by this latter parameter are essentially due to the high mobility of these free electrons. They are located in the conduction band of the metal and are weakly bound to the metal atoms. The metal can then be described as an array of positively charged ions (metal atoms including the atomic nucleus and some but not all electrons involved in the atomic bounds; these latter electrons are then located in the valence bands) surrounded by a gas of free electrons, negatively charged. Taking into account such specificities, several models have been proposed to be able to explain the electronic properties of the metal. These models are based on the determination of the conductivity of the metal but also of specific interactions of the electron with their material environment. The conductivity, , can be defined as the capability of a material to produce an electrical current under the excitation of an external electric field (constant or alternative). It is then defined as the coefficient that relied on the current density, J, and the external electric field, E, such as:This relation is known as the local Ohm law. Since J and E are vectorial quantities, can be a tensor.Molecular Plasmonics, First Edition. Wolfgang Fritzsche and Marc Lamy de la Chapelle.

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Section: Nanoholes In Other Materialsmentioning

confidence: 99%

Section: Nanoholes In Other Materialsmentioning

confidence: 99%

Section: Nanoholes In Other Materialsmentioning

confidence: 99%

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confidence: 99%

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Plasmonic Effects

2014

Molecular Plasmonics

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“…Jahr et al detected DNA hybridization events using gold nanoparticles in nanoholes in a chromium film but did not utilize gap plasmons. 21 Cecchini et al investigated surface-enhanced Raman scattering (SERS) from functionalized Au nanoparticles flowing through a nanopore in a gold film, 22 but the correlation between particle position and spectral response was not investigated. The present work investigates the optical response of a new hybrid Au-Al NP-in-a-hole system.…”

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confidence: 99%

Omnidirectional excitation of sidewall gap-plasmons in a hybrid gold-nanoparticle/aluminum-nanopore structure

Lumdee

Kik

2016

APL Photonics

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The gap-plasmon resonance of a gold nanoparticle inside a nanopore in an aluminum film is investigated in polarization dependent single particle microscopy and spectroscopy. Scattering and transmission measurements reveal that gap-plasmons of this structure can be excited and observed under normal incidence excitation and collection, in contrast to the more common particle-on-a-mirror structure. Correlation of numerical simulations with optical spectroscopy suggests that a local electric field enhancement factor in excess of 50 is achieved under normal incidence excitation, with a hot-spot located near the top surface of the structure. It is shown that the strong field enhancement from this sidewall gap-plasmon mode can be efficiently excited over a broad angular range. The presented plasmonic structure lends itself to implementation in low-cost, chemically stable, easily addressable biochemical sensor arrays providing large optical field enhancement factors.

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