# Imaging Gigahertz Zero-Group-Velocity Lamb Waves

## TL;DR

This study visualizes GHz zero-group-velocity Lamb waves in a nanoscale bilayer using ultrafast optics, demonstrating their stationary behavior and potential for testing bonded nanostructures.

## Contribution

Introduces a novel optical imaging method to observe ZGV Lamb waves in the time domain with high spatial and frequency resolution.

## Key findings

- Imaged ZGV Lamb waves with micron resolution.
- Extracted dispersion curves, Q factor, and lifetime of ZGV modes.
- Demonstrated potential for testing nanostructures.

## 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.