In this work, we systematically investigated the ultrafast optical properties of aluminum (Al) thin films on silicon cantilevers using a microscopic femtosecond optical pump-probe technique to explore the effect of light irradiation upon cantilevers while considering radiation pressure and photothermal effects. The ultrafast laser pulses used for the study were less than 30 fs in pulse duration and 830 nm in wavelength, and the photon energy (1.49 eV) of the light pulses is close to the interband transition threshold (ITT) of Al. Therefore, the change in ITT due to the strain of the cantilevers induced by the light irradiation is detected through the change in the transient reflectivity, which is dominated by the thermalized (Th) electron signal. We uncovered the position dependency of the transient reflectivity change and the Th electronic signal amplitude of the 100 nm-thick Al films on 160 $μ$m, 200 $μ$m and 240 $μ$m-length cantilevers, and these results are in excellent agreement with two temperature model-based curve fits. Furthermore, to understand the effect of light irradiation, we derived equations for the position-dependent radiation pressure effect and the photothermal effect, and demonstrated that thermal expansion-induced changes in ITT dominate the position dependence of the signal intensity. Our findings offer avenues for exploring strain effects on ultrafast properties and applications for ultrafast scanning probe microscopy.
Burst Mode Ultrafast Laser Welding of Sapphire and Fe-36Ni Alloy with Non-optical Contact Condition
Jiangxi Key Laboratory of Intelligent Robot, College of Advanced Manufacturing, Nanchang University（南昌大学先进制造学院）；Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences（中国科学院上海光学精密机械研究所）
All-optical control in metal nanocomposites due to a reversible transition between the local-field-enhancement and a local-field-depression upon irradiation by ultrashort control-pulses of light
Probing the formation of femtosecond laser-induced periodic surface structures on silica films by ultrafast small-angle X-ray scattering
University of Duisburg-Essen（杜伊斯堡-埃森大学）；Bentley Systems, Incorporated（宾利系统公司）；European XFEL（欧洲自由电子激光实验室）；Bundesanstalt für Materialforschung und -prüfung (BAM)（联邦材料研究与测试研究所）；Warsaw University of Technology（华沙理工大学）；Institute of Physics, Polish Academy of Sciences（波兰科学院物理研究所）；SLAC National Accelerator Laboratory（斯坦福直线加速器中心）
Photonic Learning in Ultrafast Laser-Induced Complexity
Université Jean Monnet（圣埃蒂安让·莫内大学）；CNRS, Laboratoire Hubert Curien UMR 5516（法国国家科学研究中心，于贝尔·居里实验室 UMR 5516）；Inria team MALICE（Inria MALICE 团队）；Institut Universitaire de France (IUF)（法国高等研究院）
Universität Siegen（锡根大学）；Elettra Sincrotrone Trieste（的里雅斯特电光同步辐射中心）；Massachusetts Institute of Technology（麻省理工学院）；Max Born Institute（马克斯·博恩研究所）；Università degli Studi di Trieste（的里雅斯特大学）；University of Erlangen-Nürnberg（埃尔朗根-纽伦堡大学）；Johannes Gutenberg-Universität Mainz（美因茨约翰内斯·古腾堡大学）；Ca’ Foscari University of Venice（威尼斯卡福斯卡里大学）；Synchrotron SOLEIL（SOLEIL同步辐射实验室）
Influence of Inter-Pulse Delay and Geometric Constraints on Damage and Optical Characteristics in thin Metal Targets Irradiated by Double Ultrashort Laser Pulses
Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology (FORTH)（电子结构与激光研究所，研究与技术基金会）
Photoelectron chiral dichroism induced by lasers without helicity via chiral hole wave-packets
Schulich Faculty of Chemistry, Technion – Israel Institute of Technology（舒利希化学学院，以色列理工学院）；Raymond and Beverly Sackler Faculty of Exact Sciences, School of Chemistry, Tel Aviv University（雷蒙德和贝弗利·萨克勒精确科学学院，特拉维夫大学）
