Pressure in electronically excited warm dense metals

Stegaĭlov, V. V.; Zhilyaev, Petr

doi:10.1002/ctpp.201400103

Cited by 15 publications

(9 citation statements)

References 64 publications

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“…The question about the electron pressure description is a crucial aspect of simulation for gold. 30,52,53 Inclusion of the electron pressure in the model leads to the short type of ablation. At the same time, the detailed experimental study of the dependence of surface morphology on absorbed energy is not carried out for single laser pulse.…”

Section: B Simulation Of Ablation In Goldmentioning

confidence: 99%

Atomistic simulation of laser-pulse surface modification: Predictions of models with various length and time scales

Starikov

Pisarev

2015

Journal of Applied Physics

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Articles you may be interested inThe origins of pressure-induced phase transformations during the surface texturing of silicon using femtosecond laser irradiation J. Appl. Phys. 112, 083518 (2012); 10.1063/1.4759140Experimental study of femtosecond laser-stimulated electrical discharges in small gaps and surface modifications Space and time resolved temperature measurements in laser pulse-produced metal melts Rev.In this work, the femtosecond laser pulse modification of surface is studied for aluminium (Al) and gold (Au) by use of two-temperature atomistic simulation. The results are obtained for various atomistic models with different scales: from pseudo-one-dimensional to full-scale three-dimensional simulation. The surface modification after laser irradiation can be caused by ablation and melting. For low energy laser pulses, the nanoscale ripples may be induced on a surface by melting without laser ablation. In this case, nanoscale changes of the surface are due to a splash of molten metal under temperature gradient. Laser ablation occurs at a higher pulse energy when a crater is formed on the surface. There are essential differences between Al ablation and Au ablation. In the first step of shock-wave induced ablation, swelling and void formation occur for both metals. However, the simulation of ablation in gold shows an additional athermal type of ablation that is associated with electron pressure relaxation. This type of ablation takes place at the surface layer, at a depth of several nanometers, and does not induce swelling. V C 2015 AIP Publishing LLC. JOURNAL OF APPLIED PHYSICS 117, 135901 (2015) [This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to ] IP: 93.175.4.208 On: Wed, 01 Apr 2015 17:44:27 135901-2 S. V. Starikov and V. V. Pisarev J. Appl. Phys. 117, 135901 (2015) [This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to ] IP: 93.175.4.208 On: Wed, 01 Apr 2015 17:44:27 135901-3 S. V. Starikov and V. V. Pisarev J. Appl. Phys. 117, 135901 (2015) [This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to ] IP: 93.175.4.208 On: Wed, 01 Apr 2015 17:44:27 135901-4 S. V. Starikov and V. V. Pisarev J. Appl. Phys. 117, 135901 (2015) [This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to ] IP: 93.175.4.208 On: Wed, 01 Apr 2015 17:44:27 135901-5 S. V. Starikov and V. V. Pisarev J. Appl. Phys. 117, 135901 (2015) [This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to ] IP: 93.175.4.208 On: Wed, 01 Apr 2015 17:44:27 135901-6 S. V. Starikov and V. V. Pisarev J. Appl. Phys. 117, 135901...

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Section: B Simulation Of Ablation In Goldmentioning

confidence: 99%

Atomistic simulation of laser-pulse surface modification: Predictions of models with various length and time scales

Starikov

Pisarev

2015

Journal of Applied Physics

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“…23 Therefore, in case of metals, where many electrons with good mobility exist, we expect that the explanation based on the CE model should be replaced by the former explanation. Although these previous studies have suggested that a large contribution of the force induced by change of the electronic states originates from the kinetic energy of free (delocalized) electrons, 18,19,24,25 the validity of this explanation has yet to be clarified. Furthermore, comparison with experimental results has not been performed sufficiently.…”

mentioning

confidence: 97%

“…Although these previous studies have suggested that a large force contribution induced by changes in the electronic states originates from the kinetic energy of free (delocalized) electrons. 18,19,24,25) The validity of this explanation has yet to be clarified. Furthermore, a sufficient comparison with experimental results has not been performed.…”

mentioning

confidence: 99%

Possible electronic entropy-driven mechanism for non-thermal ablation of metals

Tanaka¹,

Tsuneyuki²

2018

Appl. Phys. Express

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The physical mechanism for metal ablation induced by femtosecond laser irradiation was investigated. Results of calculations based on finite-temperature density functional theory (FTDFT) indicate that condensed copper becomes unstable at high electron temperatures due to an increase of electronic entropy at large volume, where the local density of states near the Fermi energy increases. Based on these results, an electronic entropy-driven (EED) model is proposed to explain metal ablation with a femtosecond laser. In addition, a mathematical model is developed for simulation of the laser ablation, where the effect of the electronic entropy is included. This mathematical model can quantitatively describe the experimental data in the low-laser-fluence region, where the electronic entropy effect is determined to be especially important.

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“…Films thinner than thickness of a heat affected zone d T are called thin here (for gold d T ≈ 150 nm). Their dynamics, freezing at late times, and structures fixed during the freezing processes are qualitatively different from those which correspond to the bulk targets; onedimensional (1D) dynamics of bulk targets was studied in papers [33][34][35][36][37][38][39][40][41]. The thin films are considered in the presented paper.…”

Section: General Viewmentioning

confidence: 99%

Ultrashort pulse action onto thin film on substrate: Qualitative model of shock propagation in substrate explaining phenomenon of fast growth of a hole with increase of absorbed energy

Shepelev,

Inogamov,

Khokhlov

et al. 2018

Preprint

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Thin films on substrate are important class of targets for surface nanomodification for plasmonic or sensoric applications. There are many papers devoted to this problem. But all of them are concentrated on dynamics of a film, paying small attention to substrate. In these papers the substrate is just an object absorbing the first shock. Here we present another point of view directed onto dynamics of a substrate. We consider (i) generation of a shock wave (SW) in a support by impact of a contact; (ii) transition from one-dimensional to twodimensional (2D) propagation of SW; (iii) we analyze lateral propagation of the SW along a film-support contact; and (iv) we calculate pressure in the compressed layer behind the decaying SW. This positive pressure acting from substrate to the film accelerates the film in direction to vacuum. Above some threshold, velocity of accelerated film is enough to separate the film from support. In these cases the circle of separation is significantly wider than the circle of the focal laser spot on film surface. Absorbed laser heat exponentially decays around an irradiated spot F = Fc exp(−r 2 /R 2 L ), where RL is radius of a Gaussian beam, F and Fc are local and central fluences, r is a radius from the axis. While the law of decay for the 2D SW in substrate is the power law. Therefore in our case of powerful laser action the edge of a separation circle is defined by propagation of the SW in the support.

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Pressure in electronically excited warm dense metals

Cited by 15 publications

References 64 publications

Atomistic simulation of laser-pulse surface modification: Predictions of models with various length and time scales

Atomistic simulation of laser-pulse surface modification: Predictions of models with various length and time scales

Possible electronic entropy-driven mechanism for non-thermal ablation of metals

Ultrashort pulse action onto thin film on substrate: Qualitative model of shock propagation in substrate explaining phenomenon of fast growth of a hole with increase of absorbed energy

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