Synchronous Detection of Nonlinear Phenomena in Opto-Acoustic Vibrations Induced in a Nanofilm by a Femtosecond Laser Pulse

IF 1.4 4区 物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY JETP Letters Pub Date : 2024-11-12 DOI:10.1134/S0021364024603208
V. A. Khokhlov, S. A. Romashevskiy, S. I. Ashitkov, N. A. Inogamov
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Abstract

Studies of the laser-induced ultrafast processes in thin films are of significant importance for the development of microelectronics. These processes include the heating of an electron subsystem, relaxation and transport of the absorbed energy, and generation and propagation of picosecond acoustic waves. In view of this circumstance, to study the dynamics of variation of the differential reflection coefficient ΔR(t)/R0 of a 73-nm-thick Ni film on a glass substrate, pump–probe measurements have been performed in this work with the synchronous detection of a ΔR(t)/R0 signal. High absorbed fluences up to 11 mJ/cm2 have been reached by increasing the pulse-repetition interval tcool of heating (pump) pulses. An increase in tcool makes it possible to better cool the film after heating. As a result, record temperatures Te ≈ 3 kK and Ti ≈ 1 kK and stresses up to 7 GPa have been reached for the first time to the best of our knowledge. These high values have allowed the observation of nonlinear effects for the first time in experiments with synchronous detection.

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同步检测飞秒激光脉冲在纳米薄膜中诱导的光声振动中的非线性现象
研究薄膜中激光诱导的超快过程对微电子学的发展具有重要意义。这些过程包括电子子系统的加热、吸收能量的弛豫和传输以及皮秒声波的产生和传播。有鉴于此,为了研究玻璃基板上 73 纳米厚镍薄膜的差分反射系数 ΔR(t)/R0 的动态变化,本研究利用同步检测 ΔR(t)/R0 信号的方法进行了泵探测量。通过增加加热(泵)脉冲的脉冲重复间隔 tcool,吸收通量可高达 11 mJ/cm2。tcool 的增大可以更好地冷却加热后的薄膜。因此,据我们所知,首次达到了创纪录的温度 Te ≈ 3 kK 和 Ti ≈ 1 kK 以及高达 7 GPa 的应力。这些高数值使得我们能够在同步检测实验中首次观察到非线性效应。
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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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