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JOURNALS // Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki // Archive

Pis'ma v Zh. Èksper. Teoret. Fiz., 2024 Volume 120, Issue 8, Pages 605–614 (Mi jetpl7350)

This article is cited in 1 paper

OPTICS AND NUCLEAR PHYSICS

Nonequilibrium heating of electrons, melting, and modification of a nickel nanofilm by an ultrashort terahertz pulse

S. I. Ashitkov, P. S. Komarov, A. V. Ovchinnikov, S. A. Romashevskii, E. V. Struleva, O. V. Chefonov, M. B. Agranat

Joint Institute for High Temperatures, Russian Academy of Sciences, Moscow

Abstract: The evolution of the optical properties of a 25-nm-thick nickel film on a glass substrate excited by a subpicosecond terahertz pulse with a field strength of 11 MV/cm has been studied by femtosecond interference microscopy with a time resolution of 10–13 s. The measurements of the complex reflection coefficient and the permittivity in the visible range of the spectrum indicate the non-equilibrium heating of the electron subsystem of nickel to several thousands of degrees, which is accompanied by the induced increase in reflection at the initial time of irradiation and by the subsequent melting after 5–10 ps. Scanning electron and atomic force microscopy studies of the morphology of the modified surface have indicated the local melting of the nanofilm and its delamination from the substrate at this field strength.

Received: 16.05.2024
Revised: 17.09.2024
Accepted: 18.09.2024

DOI: 10.31857/S0370274X24100181


 English version:
Journal of Experimental and Theoretical Physics Letters, 2024, 120:8, 580–588


© Steklov Math. Inst. of RAS, 2025