Lee Ting-Shan, Sun Chi-Kuang
Department of Electrical Engineering and Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 10617, Taiwan.
Research Center for Applied Sciences, Academia Sinica, 128 Academia Road, Section 2, Nankang, Taipei 11529, Taiwan.
Photoacoustics. 2023 May 16;31:100509. doi: 10.1016/j.pacs.2023.100509. eCollection 2023 Jun.
Photoacoustic and thermoacoustic detection methods, including picosecond ultrasonic laser sonar based on metallic thin films, are widely used in industrial applications for their noninvasiveness. Herein, we present our findings on the phase advance effect of laser-induced picosecond ultrasonic signals in surface plasmon detection in Al nanofilms. Al has been extensively studied as a promising surface plasmon material in the ultraviolet region. Reflection time-resolved spectroscopy was integrated with a Kretschmann configuration to study the optical detection mechanisms with and without meeting the surface plasmon phase-matching condition. Through a comparison of the phase changes in picosecond ultrasonic pulses at different optical detection angles, we attributed the observed phase delay modification to the displacement of the detection region under the surface plasmon phase-matching condition.
光声和热声检测方法，包括基于金属薄膜的皮秒超声激光声呐，因其非侵入性而广泛应用于工业领域。在此，我们展示了关于激光诱导皮秒超声信号在铝纳米薄膜表面等离子体检测中的相位超前效应的研究结果。铝作为一种在紫外区域有前景的表面等离子体材料已得到广泛研究。将反射时间分辨光谱与克雷奇曼配置相结合，以研究满足和不满足表面等离子体相位匹配条件时的光学检测机制。通过比较不同光学检测角度下皮秒超声脉冲的相位变化，我们将观察到的相位延迟变化归因于表面等离子体相位匹配条件下检测区域的位移。
