Imaging Gigahertz Zero-Group-Velocity Lamb Waves

Abstract

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.

Main : 8 pages (3 figures) - Supplementary : 4 pages (2 fig) - 1 animation

References in corpus (4)

• Sub-harmonic resonant excitation of confined acoustic modes at GHz frequencies with a high-repetition-rate femtosecond laser
• Investigation of interfacial stiffnesses of a tri-layer using Zero-Group Velocity Lamb modes
• Non contact probing of interfacial stiffnesses between two plates by Zero-Group Velocity Lamb modes
• Temporal behavior of laser induced elastic plate resonances

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• Beating resonance patterns and extreme power flux skewing in anisotropic elastic plates
• Nanoscale Imaging of Super-High-Frequency Microelectromechanical Resonators with Femtometer Sensitivity
• Homogeneous Dislocation-Induced Rainbow Concentrating for Elastic Waves
• Tunneling of Elastic Waves in a Tapered Waveguide