Quantitative optical imaging method for surface acoustic waves using optical path modulation
Quantitative optical imaging method for surface acoustic waves using optical path modulation
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DOI：
10.1103/physrevb.107.165416
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发表时间：
2022-12
影响因子：
3.7
通讯作者：
R. Hisatomi;Kotaro Taga;R. Sasaki;Y. Shiota;T. Moriyama;T. Ono
中科院分区：
文献类型：
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作者：
R. Hisatomi;Kotaro Taga;R. Sasaki;Y. Shiota;T. Moriyama;T. Ono
瑞利型表面声波（SAW）由于其表面局域化、高电可控性和低传播损耗而被用作经典和量子信息载体。声表面波与其他物理系统如磁化、电子电荷、电子自旋等之间的耦合和杂化是近年来声子学和自旋电子学研究的热点。为了讨论耦合强度，常常需要精确测量表面波的振幅。然而，只有少数这样的测量技术，它们通常需要相当复杂的分析。在这里，我们开发和演示了一个简单的测量技术，可以定量表征SAW。该技术通过光路调制光学检测由于相干驱动SAW引起的表面波动。此外，当测量系统工作在散粒噪声受限状态时，可以从光路调制信号推导出光斑处的表面斜率和位移。我们所展示的技术将是SAW相关研究的重要工具。
A Rayleigh-type surface acoustic wave (SAW) is used in various fields as classical and quantum information carriers because of its surface localization, high electrical controllability, and low propagation loss. Coupling and hybridization between the SAW and other physical systems such as magnetization, electron charge, and electron spin are the recent focuses in phononics and spintronics. A precise measurement of the surface wave amplitude is often necessary to discuss the coupling strengths. However, there are only a few such measurement techniques and they generally require a rather complex analysis. Here we develop and demonstrate a straightforward measurement technique that can quantitatively characterize the SAW. The technique optically detects the surface waving due to the coherently driven SAW by the optical path modulation. Furthermore, when the measurement system operates in the shot-noise-limited regime, the surface slope and displacement at the optical spot can be deduced from the optical path modulation signal. Our demonstrated technique will be an important tool for SAW-related research.