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Updated: Jan 24, 2026

Ultrasound-based Pulse Wave Velocity Evaluation in Mice

Ultrasound-based Pulse Wave Velocity Evaluation in Mice

Published on: February 14, 2017

Imaging gigahertz zero-group-velocity Lamb waves.

Qingnan Xie¹, Sylvain Mezil², Paul H Otsuka³

¹School of Science, Nanjing University of Science and Technology, 210094, Nanjing, People's Republic of China.

Nature Communications

|May 22, 2019

Summary

Researchers imaged stationary zero-group-velocity (ZGV) Lamb waves in two dimensions using an ultrafast optical technique. This breakthrough reveals acoustic energy localization, enabling new applications in nanostructure testing.

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Published on: May 3, 2018

Area of Science:

Physics
Materials Science
Acoustics

Background:

Zero-group-velocity (ZGV) waves exhibit unique stationary properties, enabling localized energy confinement.
These ZGV waves are highly valuable for various evaluation applications, particularly in material characterization.
Previous studies have not achieved two-dimensional tracking of ZGV waves.

Purpose of the Study:

To image gigahertz zero-group-velocity Lamb waves in the time domain.
To reveal the stationary nature and acoustic energy localization of these waves.
To enable advanced characterization of nanoscale materials.

Main Methods:

Utilized an ultrafast optical technique for high-resolution imaging.
Employed temporal and spatiotemporal Fourier transforms for frequency analysis.
Implemented intensity modulation of optical pump and probe beams to isolate ZGV modes.

Main Results:

Successfully imaged gigahertz ZGV Lamb waves in a silicon-nitride/titanium nanoscale bilayer.
Demonstrated the stationary nature and localized acoustic energy of the waves.
Extracted dispersion curves, quality factor (Q), and lifetime of the first ZGV mode.

Conclusions:

The study presents a novel method for imaging ZGV Lamb waves in two dimensions.
The findings confirm the energy localization capabilities of ZGV waves.
Potential applications include non-destructive testing and evaluation of bonded nanostructures.