Nonequilibrium Heating of Electrons, Melting, and Modification of a Nickel Nanofilm by an Ultrashort Terahertz Pulse

IF 1.4 4区 物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY
S. I. Ashitkov, P. S. Komarov, A. V. Ovchinnikov, S. A. Romashevskiy, E. V. Struleva, O. V. Chefonov, M. B. Agranat
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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.

Abstract Image

超短太赫兹脉冲对镍纳米膜的非平衡加热、熔化和改性
利用时间分辨率为10 ~ 13 s的飞秒干涉显微镜,研究了在场强为11 MV/cm的亚皮秒太赫兹脉冲作用下,玻璃基板上25 nm厚镍膜光学性质的演变。复反射系数和介电常数在光谱可见范围内的测量表明,镍的电子子系统的非平衡加热达到了几千度。这伴随着在初始照射时反射的增加以及随后在5-10 ps后的熔化。对修饰表面形貌的扫描电子和原子力显微镜研究表明,在该场强下,纳米膜局部熔化并从衬底剥离。
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来源期刊
JETP Letters
JETP Letters 物理-物理:综合
CiteScore
2.40
自引率
30.80%
发文量
164
审稿时长
3-6 weeks
期刊介绍: All topics of experimental and theoretical physics including gravitation, field theory, elementary particles and nuclei, plasma, nonlinear phenomena, condensed matter, superconductivity, superfluidity, lasers, and surfaces.
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