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Evanescent Field Based Photoacoustics: Optical Property Evaluation at Surfaces

Evanescent Field Based Photoacoustics: Optical Property Evaluation at Surfaces

Published on: July 26, 2016

Acoustic tractor beam.

Christine E M Démoré¹, Patrick M Dahl², Zhengyi Yang¹

¹Institute for Medical Science and Technology, University of Dundee, 1 Wurzburg Loan, Dundee DD2 1FD, Scotland, United Kingdom.

Physical Review Letters

|May 20, 2014

Summary

This summary is machine-generated.

Researchers demonstrated negative radiation forces using an acoustic tractor beam, enabling macroscopic objects to be attracted towards the sound source. This finding illustrates a key concept in acoustic manipulation and wave-matter interactions.

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Area of Science:

Acoustics
Wave Physics
Experimental Mechanics

Background:

Negative radiation forces, acting against beam propagation, have been difficult to demonstrate experimentally.
Understanding these forces is crucial for advancing acoustic manipulation technologies.

Purpose of the Study:

To experimentally demonstrate negative radiation forces using an acoustic tractor beam.
To map the operational regimes of these forces on macroscopic targets.
To compare experimental findings with theoretical simulations.

Main Methods:

Generation of an acoustic tractor beam using an ultrasonic array.
Operation on macroscopic targets exceeding 1 cm in size.
Comparison of experimental results with computational simulations.

Main Results:

Successful demonstration of negative radiation forces causing attraction towards the acoustic source.
Identification of regimes where negative radiation forces dominate over other forces.
Attribution of the effect to nonconservative forces from momentum flux redirection, not potential energy gradients.

Conclusions:

The study provides a clear illustration of negative radiation pressure in acoustic tractor beams.
The simple experimental setup facilitates understanding of tractor beam principles.
Continuous attraction of targets against net momentum flux is achievable, advancing acoustic levitation and manipulation.