Time-resolved thermoreflectivity of thin gold films and its dependence on film thickness (Appl. Phys. B 64, 387F–390 (1997))

Hohlfeld, J.; Müller, J.G.; Wellershoff, S.-S.; Matthias, E.

doi:10.1007/s003400050333

Cited by 33 publications

(36 citation statements)

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“…This e-p equilibration in Au films has been extensively studied [4,6,[14][15][16]. Smith and Norris studied electron-phonon coupling in Au films at electron energies far below the Interband Transition Threshold (ITT); i.e.…”

Section: Introductionmentioning

confidence: 99%

Substrate influence in electron–phonon coupling measurements in thin Au films

Hopkins

2007

Applied Surface Science

100

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Section: Introductionmentioning

confidence: 99%

Substrate influence in electron–phonon coupling measurements in thin Au films

Hopkins

2007

Applied Surface Science

100

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“…3(a)]. To investigate whether this fast decay arises from thermalization of photo-excited carriers via carrier-carrier scattering, whose rate should depend on the number of photo-excited carriers 22 , we measured τ 1 over a range of pump fluences spanning a photo-excitation density d between ∼10 −5 to ∼10 −3 photons per iridium site. We estimate d using the expression d = N nσξ , where N is the number of photons per pump pulse, n is the number of iridium sites per unit volume, σ is the area of the sample illuminated by the pump pulse and ξ is the optical penetration depth of photons with wavelength λ = 795 nm.…”

Section: A Fast Decay Componentmentioning

confidence: 99%

Observation of a metal-to-insulator transition with both Mott-Hubbard and Slater characteristics in Sr2IrO4from time-resolved photocarrier dynamics

et al. 2012

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“…The theoretical prediction of the uniform rise of the electronic temperature for thicknesses smaller than the ballistic range has been confirmed in a series of pumpprobe measurements of transient reflectivity performed for Au films of different thicknesses, from 10 to 500 nm. 27 The effect of the ballistic energy transport and the finite size of the film are accounted for in the source term describing the laser irradiation. 19 The range of laser fluences used in the simulations performed for Au films, from 45 to 180 J / m 2 , is chosen so that only an incomplete heterogeneous melting of the film is observed at the lowest fluence and an ultrafast homogeneous melting of the whole film is observed at the highest fluence.…”

Section: Computational Setup For Simulations Of Laser Interactionmentioning

confidence: 99%

Time-resolved diffraction profiles and atomic dynamics in short-pulse laser-induced structural transformations: Molecular dynamics study

2006

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The diffraction profiles and density correlation functions are calculated for transient atomic configurations generated in molecular dynamics simulations of a 20 nm Au film irradiated with 200 fs laser pulses of different intensity. The results of the calculations provide an opportunity to directly relate the detailed information on the atomic-level structural rearrangements available from the simulations to the diffraction spectra measured in time-resolved x-ray and electron diffraction experiments. Three processes are found to be responsible for the evolution of the diffraction profiles. During the first several picoseconds after the laser excitation, the decrease of the intensity of the diffraction peaks is largely due to the increasing amplitude of thermal atomic vibrations and can be well described by the Debye-Waller factor. The effect of thermoelastic deformation of the film prior to melting is reflected in shifts and splittings of the diffraction peaks, providing an opportunity for experimental probing of the ultrafast deformations. Finally, the onset of the melting process results in complete disappearance of the crystalline diffraction peaks. The homogeneous nucleation of a large number of liquid regions throughout the film is found to be more effective in reducing long-range correlations in atomic positions and diminishing the diffraction peaks as compared to the heterogeneous melting by melting front propagation. For the same fraction of atoms retaining the local crystalline environment, the diffraction peaks are more pronounced in heterogeneous melting. A detailed analysis of the real space correlations in atomic positions is also performed and the atomic-level picture behind the experimentally observed fast disappearance of the correlation peak corresponding to the second nearest neighbors in the fcc lattice during the laser heating and melting processes is revealed.

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Time-resolved thermoreflectivity of thin gold films and its dependence on film thickness (Appl. Phys. B 64, 387F–390 (1997))

Cited by 33 publications

References 0 publications

Substrate influence in electron–phonon coupling measurements in thin Au films

Substrate influence in electron–phonon coupling measurements in thin Au films

Observation of a metal-to-insulator transition with both Mott-Hubbard and Slater characteristics in Sr2IrO4from time-resolved photocarrier dynamics

Time-resolved diffraction profiles and atomic dynamics in short-pulse laser-induced structural transformations: Molecular dynamics study

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