Acoustical breakdown of materials by focusing of laser-generated Rayleigh surface waves

作者：Veysset David^*; Maznev A A; Veres Istvan A; Pezeril Thomas; Kooi Steven E; Lomonosov Alexey M; Nelson Keith A

来源：Applied Physics Letters, 2017, 111(3): 031901.

DOI：10.1063/1.4993586

Focusing of high-amplitude surface acoustic waves leading to material damage is visualized in an all-optical experiment. The optical setup includes a lens and an axicon that focuses an intense pico-second excitation pulse into a ring-shaped pattern at the surface of a gold-coated glass substrate. Optical excitation induces a surface acoustic wave (SAW) that propagates in the plane of the sample and converges toward the center. The evolution of the SAW profile is monitored using interferometry with a femtosecond probe pulse at variable time delays. The quantitative analysis of the full-field images provides direct information about the surface displacement profiles, which are compared to calculations. The high stress at the focal point leads to the removal of the gold coating and, at higher excitation energies, to damage of the glass substrate. The results open the prospect for testing material strength on the microscale using laser-generated SAWs. Published by AIP Publishing.

• 出版日期2017-7-17
• 单位MIT