Fitting the optical constants of gold, silver, chromium, titanium, and aluminum in the visible bandwidth

Barchiesi, Dominique; Grosges, Thomas

doi:10.1117/1.jnp.8.083097

Cited by 105 publications

(62 citation statements)

References 48 publications

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“…Recently thin Ti film is paid extensive attention due to its promising applications in solar selective absorbing coatings [4,5,14], phase-change random access memory [2], and adhesion layers for less adhesive metals [15]. The optical properties of Ti thin film are reported to be significantly different with its bulk counterpart [7,16,17].…”

Section: Introductionmentioning

confidence: 99%

Study of the thickness effect on the dielectric functions by utilizing a wedge-shaped Ti film sample with continuously varied thickness

Zhang

Cai

et al. 2015

Appl. Phys. A

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The dielectric functions of direct-current-sputtered wedge-shaped ultrathin titanium (Ti) film on K9 glass were investigated in this paper. The wedge-shaped Ti thin film was deposited under the identical conditions with continuously varied thickness. Atomic force microscope revealed that the thin film surface was very smooth with the surface roughness of about 0.5 nm. The dielectric functions of the wedge-shaped films in the wavelength range of 300-1200 nm were obtained by a focused-beam ellipsometer with the beam size on the sample about 200 lm. Results show that e 1 , the real part of the dielectric function, is negative almost in the whole spectrum region, proving that the film at the measured area is continuous and shows metallic behavior. On the other hand, e 1 decreases with the increase in the film thickness, while e 2 , the imaginary part of the dielectric function, has the opposite variation tendency. The changing of e 1 with film thickness is due to the reduced electron-electron interactions and enhanced metallic behavior. While for e 2 , it gets larger with the increase in the film thickness, which is mainly owing to the decrease in the tensile stress in the film.

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Section: Introductionmentioning

confidence: 99%

Study of the thickness effect on the dielectric functions by utilizing a wedge-shaped Ti film sample with continuously varied thickness

Zhang

Cai

et al. 2015

Appl. Phys. A

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“…It's hard to see why any excited electrons would influence PE2-CH 2 OH but not PE3-CH 2 OH. Secondly, the wavelength dependence would be difficult to explain considering both 532 nm and 600 nm being above the resonances of gold [74].…”

Section: Glasses With Gold Nanoparticles and Pe3-ch 2 Ohmentioning

confidence: 99%

Sol-Gel Glasses Doped with Pt-Acetylides and Gold Nanoparticles for Enhanced Optical Power Limiting

Lundén¹

2017

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High power laser pulses can be a threat to sensors, including the human eye. Traditionally this threat has been alleviated by colour filters that blocks radiation in chosen wavelength ranges. Colour filters' main drawback is that they block radiation regardless of it being useful or damaging, information is removed for wavelengths at which the filter protect. Protecting the entire wavelength range of a sensor would block or strongly attenuate the radiation needed for the operation of the sensor.Sol-gel glasses highly doped with Pt-Acetylide chromophores have previously shown high optical quality in combination with efficient optical power limiting through reverse saturable absorption 1 . These filters will transmit visible light unless the light fluence is above a certain threshold. A key design consideration of laser protection filters is linear absorption in relation to threshold level. By increasing chromophore concentration the threshold is lowered at the expense of higher linear absorption. This means that the user's view is degraded through the filter.Adding small amounts of gold nanoparticles to the glasses resulted in an increase in optical power limiting performance. The optimal concentration of gold nanoparticles corresponded to a mean particle distance of several micrometers. The work in this licentiate thesis is about the characterization and explanation of this effect.The glasses investigated in this work were MTEOS Sol-Gel glasses doped with either only gold nanoparticles of varying shape and concentration, 50 mM of PE2-CH 2 OH codoped with gold nanoparticles or 50 mM of PE3-CH 2 OH codoped with gold nanoparticles. The glasses only doped with gold nanoparticles showed high optical power limiting performance at 532 nm laser wavelength, but no optical power limiting at the fluences tested at 600 nm. The PE2-CH 2 OH glasses codoped with gold nanoparticles showed an enhancement of optical power limiting at 600 nm for the low gold nanoparticle concentration glasses. The enhancement was weak-1 Standard nomenclature, see section 1.3.3.iii iv ened or not present for higher concentrations. A similar enhancement above noise level for the PE3-CH 2 OH glasses was not found.A population model is used to give a qualitative explanation of the findings. The improvement in optical power limiting performance for the PE2-CH 2 OH glasses is explained by the gold nanoparticles helping to more quickly populate the highly absorbing triplet state during the rising edge of the laser pulse by enhancing two-photon absorption. The lack of any marked enhancement for the PE3-CH 2 OH glasses is explained by the PE3-CH 2 OH chromophore already being of sufficiently high performance to quickly populate the highly absorbing triplet state during the rising edge of the laser pulse. Further work is necessary to validate this model against other chromophores and improving its quantitative predictive power. Populärvetenskaplig sammanfattningLaserpulser med hög effekt kan vara ett hot mot sensorer, inklusive människoögat. Traditi...

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“…For this, Finite Difference Time Domain method (FDTD) is used [8,16]. In this case, the optical properties of metals are described by Drude-Lorentz model [17,18]. The model system consists of gold and silver spheres.…”

Section: Fdtd Modeling Of the Effects Of The Particle Spacing And Thementioning

confidence: 99%

Structure and Morphology Effects on the Optical Properties of Bimetallic Nanoparticle Films Laser Deposited on a Glass Substrate

Kucherik

Arakelyan

Kutrovskaya

et al. 2017

Journal of Nanomaterials

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Moving nanosecond laser system is used for laser-assisted thermodiffusion deposition of metallic nanoparticles from water-based colloidal solutions. The results obtained for both gold and silver nanoparticles show that film morphology strongly depends on laser scanning speed and the number of passages. We show, furthermore, the possibility of producing bimetallic Au:Ag thin films by laser irradiation of the mixed solutions. As a result of several laser scans, granular nanometric films are found to grow with a well-controlled composition, thickness, and morphology. By changing laser scanning parameters, film morphology can be varied from island structures to quasi-periodic arrays. The optical properties of the deposited structures are found to depend on the film composition, thickness, and mean separation between the particles. The transparency spectra of the deposited films are shown to be defined by their morphology.

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Fitting the optical constants of gold, silver, chromium, titanium, and aluminum in the visible bandwidth

Cited by 105 publications

References 48 publications

Study of the thickness effect on the dielectric functions by utilizing a wedge-shaped Ti film sample with continuously varied thickness

Study of the thickness effect on the dielectric functions by utilizing a wedge-shaped Ti film sample with continuously varied thickness

Sol-Gel Glasses Doped with Pt-Acetylides and Gold Nanoparticles for Enhanced Optical Power Limiting

Structure and Morphology Effects on the Optical Properties of Bimetallic Nanoparticle Films Laser Deposited on a Glass Substrate

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