Dependence of the optical properties of UHV deposited silver thin films on the deposition parameters and their relation to the nanostructure of the films

Savaloni, Hadi; Firouzi-Arani, Masoumeh

doi:10.1080/14786430801953142

Cited by 11 publications

(3 citation statements)

References 40 publications

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“…It is well known that the permittivity of Ag is dependent upon the deposition conditions; 16,31,32 thus, it is necessary to characterize each film individually. The frequency dependence of the permittivity in the visible region of the spectrum can generally be described by the Drude model…”

Section: A Linear Characterizationmentioning

confidence: 99%

A comprehensive analysis of the contributions to the nonlinear optical properties of thin Ag films

Owens

Fuentes-Hernández

Hales

et al. 2010

Journal of Applied Physics

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The nonlinear optical properties of 20 nm thick Ag films are investigated by time-resolved whitelight continuum pump-probe experiments in both transmission and reflection mode. The dynamics of changes in permittivity ⌬ are measured at wavelengths between 500 to 700 nm. The data is fitted to a modified Drude model in the frequency domain and to a two-temperature model in the time domain. Changes in the individual Drude parameters are calculated as a function of time. A single, coherent model is proposed based on these fittings that describes the dynamics of the nonlinear optical properties of Ag, which could be used to model the nonlinear responses of multilayer structures containing thin films of Ag. The physical origins of the observed responses are discussed.

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Section: A Linear Characterizationmentioning

confidence: 99%

A comprehensive analysis of the contributions to the nonlinear optical properties of thin Ag films

Owens

Fuentes-Hernández

Hales

et al. 2010

Journal of Applied Physics

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“…[ 10 ] A significant number of scientists have determined the VIS–NIR optical constants of graphene, [ 11–15 ] but the results strongly depend on the deposition and growth method, purity, oxidation, transfer, and interactions with the substrate. [ 16,17 ]…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Few‐Layer Graphene: Optical Anisotropy and Pseudo‐Brewster Angle Shift in Vacuum Ultraviolet Spectral Range

Ahmed

Nicolosi

Jimenez

et al. 2021

Advanced Photonics Research

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The optical properties of mono‐ and trilayer graphene on SiO2/Si substrate are studied at hydrogen Lyman‐alpha (121.6 nm) spectral line for the first time. The optical anisotropy of graphene at this wavelength is experimentally demonstrated by retrieving the anisotropic “effective” optical constants. The results confirm that the axis of symmetry is nearly perpendicular to the surface and coherently related to the π‐orbitals’ structural orientation. Furthermore, it is observed that graphene strongly affects the performances of the substrate by inducing a pseudo‐Brewster angle downshift, which depends on the number of graphene layers. This finding is in contrast with what occurs in the visible spectral range, where the upshift of the pseudo‐Brewster angle is experienced in similar samples.

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“…[26] In their work, contour plots of the reflectance and transmittance were used to determine the complex index of refractionñ(ω) = n(ω) + ik(ω). [29,47] Large inconsistencies between the different measurements exist and were noted early, and suggested to be due to sample contamination [48,49], differences in surface morphologies [50,51], strain [44,52], and the different measurement techniques. [16] Some data even appear unphysical with noted anomalies such as a broad peak in the reflectance spectrum at 5 µm.…”

Section: Past Measurements Of Dielectric Functionmentioning

confidence: 99%

Optical dielectric function of silver

et al. 2015

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The dielectric function of silver is a fundamental quantity related to its electronic structure and describes its optical properties. However, results published over the past six decades are in part inconsistent and exhibit significant discrepancies. The measurement is experimentally challenging with the values of dielectric function spanning over five orders of magnitude from the mid-infrared to the visible/ultraviolet spectral range. Using broadband spectroscopic ellipsometry, we determine the complex valued dielectric function of evaporated and template stripped polycrystalline silver films from 0.05 eV (λ = 25 µm) to 4.14 eV (λ = 300 nm) with a statistical uncertainty of less than 1%. From Drude analysis of the 0.1 -3 eV range, values of the plasma frequency ω p = 8.9 ± 0.2 eV, dielectric function at infinite frequency ∞ = 5 ± 2, and relaxation time τ = 1/Γ = 17 ± 3 fs are obtained, with the absolute uncertainties estimated from systematic errors and experimental repeatability. Further analysis based on the extended Drude model reveals an increase in τ with decreasing frequency in agreement with Fermi liquid theory, and extrapolates to τ 22 fs for zero frequency. A deviation from simple Fermi liquid behavior is suggested at energies below 0.1 eV (λ = 12 µm) with the onset of a further increase in τ connecting to the DC value from transport measurements of ∼ 40 fs. The results are consistent with a wide range of optical and plasmonic experiments throughout the infrared and visible/ultraviolet spectral range. The influence of grain boundaries, defect scattering, and surface oxidation is discussed. The results are compared with our previous measurements of the dielectric function of gold [Phys. Rev. B 86, 235147 (2012)].

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Dependence of the optical properties of UHV deposited silver thin films on the deposition parameters and their relation to the nanostructure of the films

Cited by 11 publications

References 40 publications

A comprehensive analysis of the contributions to the nonlinear optical properties of thin Ag films

A comprehensive analysis of the contributions to the nonlinear optical properties of thin Ag films

Experimental Study of Few‐Layer Graphene: Optical Anisotropy and Pseudo‐Brewster Angle Shift in Vacuum Ultraviolet Spectral Range

Optical dielectric function of silver

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