Optical properties of vanadium thin films

Fouad, S.S.; El-Fazary, M. H.; El-Shazly, A. A.; Sharaf, F.; Nassr, K. M.

doi:10.1007/bf01130123

Cited by 7 publications

(1 citation statement)

References 2 publications

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“…We also include, for comparison purposes, the intraband contribution to ε 2 as reported in a previous work [29]. V grains with an average diameter around 15 nm were found in the case of polycrystalline V films [30], and the subtracted Drude contribution was evaluated taking into account the finite size of the grains according to Matthiessen's rule [32], with a Fermi velocity for V equal to 3.72 × 10 7 cm s −1 [33]. As seen, the absorption peaks predicted from band structure calculations are not displayed in the spectral dependence of the interband contribution to ε 2 obtained from inversion of transmission measurements.…”

Section: Dielectric Function Of a Crystalline V Filmmentioning

confidence: 99%

Temperature- and hydrogen-induced changes in the optical properties of Pd capped V thin films

Azofeifa¹,

Clark²,

Vargas³

et al. 2012

Phys. Scr.

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Optical properties of V thin films deposited on MgO substrates have been obtained from spectrophotometric measurements. The V films were coated with a thin Pd layer to protect them from oxidation and to favor absorption of atomic hydrogen. Electrical resistance was recorded while hydrogen pressure was increased slowly up to 750 mbar keeping the temperature constant. Simultaneously, visible and near-infrared transmittance spectra of this Pd/V/MgO system were measured. The spectra were numerically inverted to obtain the spectral behavior of the Pd and V dielectric functions at 22 and 140 °C. Hydrogen concentrations were first determined from the combined effect of hydrogen content on the electrical resistance and on the optical direct transmission of the system. Then, determination of these concentrations was improved using retrieved values of the absorption coefficients of the hydrides and taking into account the structural change of V and the volumetric expansion of Pd. Good agreement is established when considering qualitative correlations between spectral features of the optimized PdHy and VHx dielectric functions and band structure calculations and densities of states for these two transition metal hydrides.

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Section: Dielectric Function Of a Crystalline V Filmmentioning

confidence: 99%

Temperature- and hydrogen-induced changes in the optical properties of Pd capped V thin films

Azofeifa¹,

Clark²,

Vargas³

et al. 2012

Phys. Scr.

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Nanoscale Dielectric Function of Fe, Pt, Ti, Ta, Al, and V: Application to Characterization of Al Nanoparticles Synthesized by Fs Laser Ablation

et al. 2016

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Development and applications of new nanomaterials and nanocomposites that include metal nanoparticles have received much attention in the last years. However, there are relatively few studies concerning basic physical characteristics of the dielectric function at the nanoscale, which is needed for predicting their optical and plasmonic response. The size-dependent complex dielectric function of metal Fe, Pt, Ti, Ta, Al, and V nanoparticles (NPs) is calculated for the first time for an extended wavelength range from UV to FIR, based on experimental bulk complex refractive index measurements in the mentioned range at room temperature. Calculation is based on a Btop-down^approach, based on a stepwise modification of the Drude model. Bulk plasma frequency (ω p ) and damping constant (γ free ) in this model are determined using a method that improves the relative uncertainties in their values and provide an insight about the wavelength range over which the metal may be considered Drude like. Validation of ω p and γ free values is demonstrated by the improved accuracy with which the experimental bulk dielectric function is reproduced. For nanometric and subnanometric scales, dielectric function is made size dependent considering sizecorrective terms for free and bound electron contributions to the bulk dielectric function. These results are applied to analyze the synthesis of Al NP suspensions using a 120-fs pulse laser to ablate an Al solid target in n-heptane and water. The presence of Al, Al-Al 2 O 3 , and air-Al core-shell structures is also reported for the first time in these type of colloids. Analysis of the structure, configuration, sizing, and relative abundance was carried out using optical extinction spectroscopy (OES). Sizing results are compared with those provided by atomic force microscopy (AFM) studies.

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The optical properties of manganese thin films

Fouad

Ammar

1995

Physica B: Condensed Matter

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Optical properties of vanadium thin films

Cited by 7 publications

References 2 publications

Temperature- and hydrogen-induced changes in the optical properties of Pd capped V thin films

Temperature- and hydrogen-induced changes in the optical properties of Pd capped V thin films

Nanoscale Dielectric Function of Fe, Pt, Ti, Ta, Al, and V: Application to Characterization of Al Nanoparticles Synthesized by Fs Laser Ablation

The optical properties of manganese thin films

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