Heat transport in metals irradiated by ultrashort laser pulses

Kanavin, A. P.; Smetanin, I. V.; Исаков, В. А.; Afanasiev, Yu. V.; Chichkov, Boris N.; Wellegehausen, B.; Nolte, Stefan; Momma, C.; Tünnermann, Andreas

doi:10.1103/physrevb.57.14698

Cited by 113 publications

(38 citation statements)

References 16 publications

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“…(6) that in the case under consideration .the wave of electron thermal conductivity ~F0 moves at the constant velocity VT = -~ -~ VF [13].…”

Section: Cet~mentioning

confidence: 98%

“…At the initial stage of the process "rp < t << "ri~, the electron temperature is high, but the ions have no time to ecquire noticeable energy (Ti -0), and one can assume that Tc >> T. ~ (TITF) 1/2. According to [13], this is the case where electron-electron collisions mainly contribute to electron relaxation. In this case one can write "re -"r0(rF/T,) 2, Ce ' 1 where ' = C~T~, ~r = C~v~F%, Cc and "r0 are constants of the metal and vF is the 3 Fermi velocity.…”

Section: Cet~mentioning

confidence: 99%

“…In this case, the time of electron relaxation is determined by electron-phonon collisions [13] and equals ,:rE ,:rE…”

Section: (9)mentioning

confidence: 99%

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Thermal regime of laser ablation of metals by ultrashort pulses of low fluence

et al. 1999

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Thermal ablation of a metal surface by low-energy ultrashort laser pulses is considered theoretically. The temporal dynamics of the surface electron and lattice temperatures is studied within the framework of the two-temperature model and for different temperature dependences of the characteristics of the metal (electron-relaxation time, heat capacity, thermal conductivity). The approximation of evaporation into a vacuum is used to determine the ablation depth. Analytical expressions for the ablation-threshold fluence Fth as well as the threshold values of the lattice temperature Tth(Fth) and the characteristic time of lattice temperature decay td(Fth) are obtained. This analytical description is in satisfactory agreement with particular numerical calculations.

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“…(6) that in the case under consideration .the wave of electron thermal conductivity ~F0 moves at the constant velocity VT = -~ -~ VF [13].…”

Section: Cet~mentioning

confidence: 98%

Section: Cet~mentioning

confidence: 99%

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Thermal regime of laser ablation of metals by ultrashort pulses of low fluence

et al. 1999

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“…The frequency of electron-electron collisions is comparable to the electron-phonon collision frequency at electron temperatures on the order of 0.05T F for copper, where T F is the Fermi temperature ͑7 eV for Cu͒. 18,19 Thus, the contribution of the electron-electron collisions to laser light absorption is important even at low temperature. This contribution is usually dominant in the temperature domain up to T F .…”

Section: Introductionmentioning

confidence: 98%

“…Therefore electron-phonon collision frequency cannot explain the increase in absorption with temperature which is typical for most experiments, e.g., Refs. 11 and 14. In the case of short pulse laser-matter interaction, where the electron temperature is much higher than the lattice temperature, it is also important to account for the effect of electron-electron collisions [15][16][17][18][19] which will increase the absorption. The frequency of electron-electron collisions is comparable to the electron-phonon collision frequency at electron temperatures on the order of 0.05T F for copper, where T F is the Fermi temperature ͑7 eV for Cu͒.…”

Section: Introductionmentioning

confidence: 99%

Experimental and theoretical study of absorption of femtosecond laser pulses in interaction with solid copper targets

et al. 2009

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The reflectivity of near-infrared 150 fs laser pulses from copper targets has been measured in the intensity range of 6 ϫ 10 11 -1.6ϫ 10 14 W cm −2 , showing a drop in reflectivity versus intensity as the target is heated. A simple semianalytical model of femtosecond electron heating and resultant optical absorption is developed to describe the time dependent and integral reflectivity covering the range from cold metal response to hot plasma response. The model is in good agreement with experimental ultrafast reflectivity measurements over the intensity range studied.

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Heat Transport without Heating?—An Ultrafast X‐Ray Perspective into a Metal Heterostructure

Pudell

Mattern

Hehn

et al. 2020

Adv Funct Materials

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When the spatial dimensions of metallic heterostructures shrink below the mean free path of its conduction electrons, the transport of electrons and hence the transport of thermal energy by electrons continuously changes from diffusive to ballistic. Electron-phonon coupling sets the mean free path to the nanoscale and the time for equilibration of electron and lattice temperatures to the picosecond range. A particularly intriguing situation occurs in trilayer heterostructures combining metals with very different electronphonon coupling strength: Heat energy deposited in few atomic layers of Pt is transported into a nanometric Ni film, which is heated more than the Cu film through which the heat is released. Femtosecond pump-probe experiments with hard X-ray pulses provide a layer-specific probe of the heat energy. A purely diffusive two-temperature model with increased thermal conductivity of hot electrons excellently reproduces the observed signals from all three layers. At the time when the Ni lattice is maximally heated, no significant heat has entered the Cu lattice. This phenomenon would be enhanced in thinner layers where ballistic transport dominates. In this context it is shown that purely diffusive transport can lead to a linear time-to-length dependence that must not be misinterpreted as ballistic transport.

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Heat transport in metals irradiated by ultrashort laser pulses

Cited by 113 publications

References 16 publications

Thermal regime of laser ablation of metals by ultrashort pulses of low fluence

Thermal regime of laser ablation of metals by ultrashort pulses of low fluence

Experimental and theoretical study of absorption of femtosecond laser pulses in interaction with solid copper targets

Heat Transport without Heating?—An Ultrafast X‐Ray Perspective into a Metal Heterostructure

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