Analysis of interband, intraband, and plasmon polariton transitions in silver nanoparticle films via <i>in situ</i> real-time spectroscopic ellipsometry

Little, Scott; Collins, R. W.; Marsillac, Sylvain

doi:10.1063/1.3564894

Cited by 16 publications

(9 citation statements)

References 15 publications

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“…Beyond a 4 nm nominal thickness, the thickness slightly decreases and remains constant in the nominal thickness range of 6 nm-17 nm. This behaviour was observed by Little et al, 22 and indicates that the film grows in a Volmer-Weber mode. [23][24][25] Adatoms migrate on the surface until they nucleate on other adatoms resulting in the formation of Ag islands (Fig.…”

Section: Discussionsupporting

confidence: 74%

Determination of optical properties of percolated nanostructures using an optical resonator system

Sukmanowski¹,

Battie

Naciri

2012

Journal of Applied Physics

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In this work, methods are introduced to the determination of optical properties of thin silver films and nanostructures. We present an optical resonant system consisting of a mirror, a transparent layer and a thin silver film. The layer sequences and the nanostructure of the thin films are investigated by optical methods consist of reflectance measurements. The structures are analyzed by atomic force microscopy and scanning electron microscopy. The optical properties are determined by modeling the reflectance data. We have found that the growth mechanisms of the silver layer are correlated to its optical properties. It also found that temperature treatments produce isolated particles with a narrow plasmon resonance.

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Section: Discussionsupporting

confidence: 74%

Determination of optical properties of percolated nanostructures using an optical resonator system

Sukmanowski¹,

Battie

Naciri

2012

Journal of Applied Physics

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“…The conversion of measured VASE data to dielectric functions that accurately describe how the samples scatter incident illumination depends sensitively on the model used, but tremendous insight may be gleaned from reasonably simple, physically meaningful approximations. 21,22,24,37 Here we report a series of VASE and variable-angle Mueller matrix (VAMM) measurements on self-assembled irregular ensembles of truncated spherical gallium NPs grown by MBE on sapphire substrates whose size distribution was spatially characterized by scanning electron microscopy (SEM). We show that for the majority of samples fabricated a Lorentz oscillator model with a damping term inversely proportional to the NP diameter accurately reproduces the salient behaviors.…”

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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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“…The Lorentz oscillator influence disappears, establishing bulk-like optical response of silver with clear optical interband transitions of d-band electrons above *4 eV. It is worth noting that the deviation from the dielectric function of bulk silver is due to the uneven surface morphology and electron scattering at grain boundaries after sintering [37]. Figure 3a, b shows the reflectivity and absorption coefficient of pristine and sintered Ag NP films.…”

Section: Thermal and Optical Properties Of Ag Npsmentioning

confidence: 94%

Laser wavelength effect on laser-induced photo-thermal sintering of silver nanoparticles

et al. 2015

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This work is concerned with the laser wavelength effect on the electrical properties and surface morphology of laser-sintered nanoparticle thin films. Silver nanoparticle thin films spin-coated on soda lime glass substrates were irradiated with lasers of three different wavelengths (near ultraviolet 405 nm, green 514.5 nm, near infrared 817 nm) at varied laser intensities and scanning speeds. Scanning electron microscopy images and ex situ resistivity measurements show that the photo-thermal sintering alters significantly the film surface morphology and electrical properties, depending on the processing parameters (laser wavelength, laser intensities and scanning speed). While the optical response of the material is determined largely by the processing laser wavelength, the laser beam intensity and scanning speed regulate the induced temperature field. Examination of the optical properties of as-deposited silver nanoparticle thin film in conjunction with scanning electron microscopy images taken from the laser-sintered lines helps elucidate how the processing laser wavelength modulates the optical response of silver nanoparticle thin film and therefore affects the thermal response.

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Analysis of interband, intraband, and plasmon polariton transitions in silver nanoparticle films via in situ real-time spectroscopic ellipsometry

Abstract: Articles you may be interested in Growth analysis of (Ag,Cu)InSe2 thin films via real time spectroscopic ellipsometry Appl.

Cited by 16 publications

References 15 publications

Determination of optical properties of percolated nanostructures using an optical resonator system

Determination of optical properties of percolated nanostructures using an optical resonator system

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

Laser wavelength effect on laser-induced photo-thermal sintering of silver nanoparticles

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