Optical properties of gold island films—a spectroscopic ellipsometry study

Lončarić, Martin; Sancho‐Parramon, Jordi; Zorc, Hrvoje

doi:10.1016/j.tsf.2010.12.068

Cited by 53 publications

(38 citation statements)

References 19 publications

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“…According to our previous investigations [36] and taking into account the deposition conditions, we expect that the films of the first series consist of nanometric and well-separated Au islands, with the island size increasing and the island density decreasing with the increase of the deposited metal amount.…”

Section: A Characterization Of Series S1mentioning

confidence: 83%

“…In the frame of this model we describe the nðλÞ and kðλÞ dispersion behavior using Gauss oscillators. Although the classical Lorentz oscillators are widely used [12], it has been shown that Gauss oscillators are more flexible and provide better data fits than Lorentz oscillators [25,36]. The reason is that in random metaldielectric composites, particles present a size and shape distribution and one may expect that the absorption is due to a distribution of resonances rather than to a single resonance.…”

Section: B Multiple Oscillator Characterization Techniquementioning

confidence: 99%

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Comparison of two techniques for reliable characterization of thin metal–dielectric films

et al. 2011

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In the present study we determine the optical parameters of thin metal-dielectric films using two different characterization techniques based on nonparametric and multiple oscillator models. We consider four series of thin metal-dielectric films produced under various deposition conditions with different optical properties. We compare characterization results obtained by nonparametric and multiple oscillator techniques and demonstrate that the results are consistent. The consistency of the results proves their reliability.

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Section: A Characterization Of Series S1mentioning

confidence: 83%

Section: B Multiple Oscillator Characterization Techniquementioning

confidence: 99%

Comparison of two techniques for reliable characterization of thin metal–dielectric films

et al. 2011

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“…Obviously, the optical properties of gold nanoparticles differ from bulk gold and this difference has to be taken into account. An appropriate and widely used solution is to treat the optical response of the particles as combination of oscillator models: typically one Drude-and three Lorentz-oscillators are used [25,26,27]. The third layer in the stack is similar to the first but not the same: the non-uniformity and the polydispersity of the particulate system result here a bit higher effective layer thickness and void ratio.…”

Section: Properties Of Langmuir-and Langmuir-blodgett Filmsmentioning

confidence: 99%

Langmuir-Blodgett Films of Gold Nanorods with Different Silica Shell Thicknesses

Gergely-Fülöp

Nagy

Deák

2015

Period. Polytech. Chem. Eng.

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We report the preparation and optical characterization of Langmuir and Langmuir-Blodgett (LB) IntroductionThe importance of wet chemical synthesis of inorganic structures owning at least one dimension at the nanoscale has been a continuously emerging topic in the last two decades. A high variety of methods have been developed synthesizing various types of nanoparticles [1][2][3][4] and thin films [5-9] for different purposes.Plasmonic gold nanoparticles gained immense attention in recent past due to their special optical properties. These small noble metal nanoparticles can support certain localized surface plasmon resonance modes that results in a very large extinction (absorption plus scattering) cross-sections and nearfield enhancements at certain wavelength [10]. There are many literature reports about how to control the optical properties of these particles through adjusting their size and shape during wet-chemical nanoparticle growth. Based on the specific interaction of the nanoparticles with light, applications in the field of cancer therapy [11], sensor applications [12] and energy conversion [13] are envisaged. Besides of the optical properties, however, the physico-chemical behavior of the particles is crucial. Due to their size the particles belong to the colloidal domain, and their interaction with other substances is governed by colloidal interactions. These often determine or limit the range of possible applications (e.g. due to aggregation or unwanted surface adsorption).In this paper we focus on the connection between the physicochemical and optical properties of gold/mesoporous silica core/ shell nanoparticles as well as their assembled structures. We investigate how an increasing thickness of silica shell affects the extinction spectrum of the nanoparticles in solution and when deposited in the form of a monolayer on a solid support.

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“…2.). Since effective medium theories were shown inadequate to describe dielectric functions of MIF, they are modelled with Gauss oscillators [15,18]. The optical parameters of dielectric constants (real and imaginary part, ε1 and ε2) of this layer are modelled with a sum of 5 Gauss oscillators.…”

Section: Modelling and Characterizationmentioning

confidence: 99%

Metal island film-based structures for sensing using spectrophotometry and ellipsometry

et al. 2013

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Metal island films (MIF) are good candidates for sensors due to the strong sensitivity of the localized surface plasmon resonance (SPR) to the environment refractive index. The strong near field enhancement in the vicinity of the island surface can be even higher if a metal layer (ML) is placed close to a MIF. Structures containing MIF with and without ML are prepared and sensitivities of spectrophotometric and ellipsometric features of the measurements compared. It is shown that simple MIF is preferable for ellipsometry-based sensing and the one including ML in the case of spectrophotometric measurements.

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Optical properties of gold island films—a spectroscopic ellipsometry study

Cited by 53 publications

References 19 publications

Comparison of two techniques for reliable characterization of thin metal–dielectric films

Comparison of two techniques for reliable characterization of thin metal–dielectric films

Langmuir-Blodgett Films of Gold Nanorods with Different Silica Shell Thicknesses

Metal island film-based structures for sensing using spectrophotometry and ellipsometry

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