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.
@article{arxiv.1901.01013,
title = {Imaging Gigahertz Zero-Group-Velocity Lamb Waves},
author = {Qingnan Xie and Sylvain Mezil and Paul H Otsuka and Motonobu Tomoda and Jérôme Laurent and Osamu Matsuda and Zhonghua Shen and Oliver B Wright},
journal= {arXiv preprint arXiv:1901.01013},
year = {2019}
}