吉赫零群速度兰姆波成像
Imaging Gigahertz Zero-Group-Velocity Lamb Waves
摘要：
我们的图像GHz零群速度（ZGV）兰姆波在时域中的超快光学技术，揭示了他们的平稳性和他们的声能本地化在两个维度。声场成像到微米分辨率的纳米级双层组成的氮化硅板涂有钛膜。时间和时空傅立叶变换与涉及光泵浦和探测光束的强度调制的技术相结合，可以访问任意的声学频率，允许ZGV模式被隔离。的双层系统的色散曲线提取连同Q因子和第一ZGV模式的寿命。应用包括测试结合的纳米结构。
英文摘要：
We image GHz zero-group-velocity (ZGV) Lamb waves in the time domain by means of an ultrafast optical technique, revealing their stationary nature and their acoustic energy localization in two dimensions. The acoustic field is imaged to micron resolution on a nanoscale bilayer consisting of a silicon-nitride plate coated with a titanium film. Temporal and spatiotemporal Fourier transforms combined with a technique involving the intensity modulation of the optical pump and probe beams gives access to arbitrary acoustic frequencies, allowing ZGV modes to be isolated. The dispersion curves of the bilayer system are extracted together with the Q factor and lifetime of the first ZGV mode. Applications include the testing of bonded nanostructures.
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