Evolution of plasmon resonances during plasma deposition of silver nanoparticles

Oates, Thomas W.; Mücklich, A.

doi:10.1088/0957-4484/16/11/023

Cited by 107 publications

(105 citation statements)

References 22 publications

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“…An exception with respect to the trends described above is the 1 nm AlOxNy sample, the transmission spectrum of which also exhibits a wide absorption feature (i.e., significantly lower transmission with respect to the other samples) extending from ~1 to ~2 eV, while the primary resonance position is located at ~2.61 eV as compared to ~2.43 eV for the 2 nm AlOxNy sample. The appearance of a second plasmonic resonance frequency (as in the case of the 1 nm AlOxNy sample in the present study) has been reported in the literature, for metal thin films close to the percolation threshold, and has been attributed to exceptionally strong dipole interaction triggered by the close proximity of metal atomic islands 56 . However, changes in the particles shape and size as the AlOxNy layer becomes thinner and does not fully cover Ag, may also explain the observed trends in the optical properties in accordance with earlier reported data on model plasmonic systems 2 .…”

Section: Resultssupporting

confidence: 84%

Synthesis of tunable plasmonic metal-ceramic nanocomposite thin films by temporally modulated sputtered fluxes

Magnfält

Melander

Boyd

et al. 2017

Journal of Applied Physics

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The scientific and technological interest for metal-dielectric nanocomposite thin films emanates from the excitation of localized surface plasmon resonances (LSPRs) on the metal component. The overall optical response of the nanocomposite is governed by the refractive index of the dielectric matrix and the properties of the metallic nanoparticles in terms of their bulk optical properties, size, and shape, and the inter-particle distance of separation. In order to tune the film morphology and optical properties, complex synthesis processes which include multiple steps-i. e., film deposition followed by post-deposition treatment by thermal or laser annealing-are commonly employed. In the present study, we demonstrate that the absorption resonances of Ag/AlOxNy nanocomposite films can be effectively tuned from green (similar to 2.4 eV) to violet (similar to 2.8 eV) using a single-step synthesis process that is based on modulating the arrival pattern of film forming species with sub-monolayer resolution, while keeping the amount of Ag in the films constant. Our data indicate that the optical response of the films is the result of LSPRs on isolated Ag nanoparticles that are seemingly shifted by dipolar interactions between neighboring particles. The synthesis strategy presented may be of relevance for enabling integration of plasmonic nanocomposite films on thermally sensitive substrates. Published by AIP Publishing.

Funding Agencies|LiU Research Fellows Program; LiU Career [Dnr-LiU-2015-01510]; Knut and Alice Wallenberg foundation [2015.0060]

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Section: Resultssupporting

confidence: 84%

Synthesis of tunable plasmonic metal-ceramic nanocomposite thin films by temporally modulated sputtered fluxes

Magnfält

Melander

Boyd

et al. 2017

Journal of Applied Physics

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Funding Agencies|LiU Research Fellows Program; LiU Career [Dnr-LiU-2015-01510]; Knut and Alice Wallenberg foundation [2015.0060]

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“…20,[24][25][26]29,30,46 The samples were subsequently measured more extensively ex situ with a J. A. Woollam Co., Inc. VASE system to collect angle-and energy-resolved VAMM and scattering spectra.…”

Section: Acs Photonicsmentioning

confidence: 99%

“…Common causes of depolarization include surface roughness, film thickness inhomogeneity, backside reflection from a weakly absorbing substrate, and plasmon resonance of nanostructures. 17,25 Note that the feature cannot be explained by enhanced coupling to the out-of-plane mode; otherwise, the feature would have grown stronger as θ i increased. Instead, the feature vanishes at larger θ i due to the shadowing effects of the larger NPs and the increasing contribution of their out-of-plane LSPR mode whose maximum occurs at 4.75 eV.…”

Section: ■ Depolarizing Behavior Of Nanoparticles With a Bimodal Sizementioning

confidence: 99%

Ultraviolet–Visible Plasmonic Properties of Gallium Nanoparticles Investigated by Variable-Angle Spectroscopic and Mueller Matrix Ellipsometry

et al. 2014

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Self-assembled, irregular ensembles of hemispherical Ga nanoparticles (NPs) were deposited on sapphire by molecular beam epitaxy. These samples, whose constituent unimodal or bimodal distribution of NP sizes was controlled by deposition time, exhibited localized surface plasmon resonances tunable from the ultraviolet to the visible (UV/ vis) spectral range. The optical response of each sample was characterized using a variable-angle spectroscopic ellipsometer, and the dielectric response of the ensemble of NPs on each sample was parametrized using Lorentz oscillators. From this, a relationship was found between NP size and the deduced Lorentzian parameters (resonant frequency, damping, oscillator strength) for most unimodal and bimodal samples at most frequencies and angles of incidence. However, for samples with a bimodal size distribution, Mueller matrix ellipsometry revealed nonspecular scattering at particular frequencies and angles, suggesting a resonant interparticle coupling effect consistent with recently observed strong local field enhancements in the ultraviolet. KEYWORDS: plasmonics, ultraviolet, gallium, nanoparticles, variable-angle spectroscopic ellipsometry, variable-angle Mueller matrix ellipsometry R esearch into the optical response of confined electronic plasma oscillations in metallic nanostructures has become the foundation of modern plasmonics. Metallic nanostructures are routinely fabricated with desired spatial geometries for specific applications including single-molecule detection, enhanced fluorescence, toxic remediation, and catalysis. 1−6 Because the optical response depends sensitively on nanostructure composition, size, and shape, increasingly sophisticated characterization tools are required: aggregate behavior may be characterized by absorption spectroscopy or dark-field microscopy, while single-particle behavior may be characterized by confocal microscopy, near-field scanning optical microscopy, and cathodoluminescence. 7−12 These tools provide incredibly detailed understanding of the absorption and scattering properties of plasmonic metal nanoparticles, especially when complemented by sophisticated electromagnetic modeling techniques such as finite difference time domain, finite element codes, and the discrete dipole approximation. 13−19 Of growing interest is the need to monitor the plasmonic properties of substrate-supported nanoparticle (NP) ensembles during fabrication. Because it is impractical to use single-particle imaging tools for this application, advances in the more traditional tools are needed to understand single-particle behaviors from aggregate measurements. Spectroscopic ellipsometry (SE) has been used to monitor how NP ensembles alter the polarization state of an incident light beam as a function of wavelength and incidence angle. 20−24 Recently, a fixed incidence angle spectroscopic ellipsometer mounted on a molecular beam epitaxy (MBE) chamber has been used to monitor in real time the deposition of nanometer-scale metallic films and NPs through...

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“…This is in accordance with the observed growth behaviour of ultrathin Ag films deposited from the plasma phase on oxide layers. 33,34 Below the percolation threshold, a predominantly island growth mechanism occurs whilst a layer-by-layer growth predominates after percolation. 32,33 Therefore, we identified this point with the percolation threshold of the Ag cluster layer.…”

mentioning

confidence: 99%

“…At the percolation threshold, the optical properties of the film changes drastically, and the maximum surface plasmon resonance takes place. 33,37 Fig . 3(c) shows the integrated intensity of the aforementioned SERS bands at different thiophenol concentrations for the substrate with an effective thickness of 5.6 6 0.1 nm.…”

mentioning

confidence: 99%

Silver substrates for surface enhanced Raman scattering: Correlation between nanostructure and Raman scattering enhancement

Santoro¹,

Yu²,

Schwartzkopf³

et al. 2014

Applied Physics Letters

105

131

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The fabrication of substrates for Surface Enhanced Raman Scattering (SERS) applications matching the needs for high sensitive and reproducible sensors remains a major scientific and technological issue. We correlate the morphological parameters of silver (Ag) nanostructured thin films prepared by sputter deposition on flat silicon (Si) substrates with their SERS activity. A maximum enhancement of the SERS signal has been found at the Ag percolation threshold, leading to the detection of thiophenol, a non-resonant Raman probe, at concentrations as low as 10−10M, which corresponds to enhancement factors higher than 7 orders of magnitude. To gain full control over the developed nanostructure, we employed the combination of in-situ time-resolved microfocus Grazing Incidence Small Angle X-ray Scattering with sputter deposition. This enables to achieve a deepened understanding of the different growth regimes of Ag. Thereby an improved tailoring of the thin film nanostructure for SERS applications can be realized.

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Evolution of plasmon resonances during plasma deposition of silver nanoparticles

Cited by 107 publications

References 22 publications

Synthesis of tunable plasmonic metal-ceramic nanocomposite thin films by temporally modulated sputtered fluxes

Synthesis of tunable plasmonic metal-ceramic nanocomposite thin films by temporally modulated sputtered fluxes

Ultraviolet–Visible Plasmonic Properties of Gallium Nanoparticles Investigated by Variable-Angle Spectroscopic and Mueller Matrix Ellipsometry

Silver substrates for surface enhanced Raman scattering: Correlation between nanostructure and Raman scattering enhancement

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