Liquid with power of light

Scientists bend liquid with power of light
Chicago, Mar 27 (AFP) A group of scientists have found a way to bend and direct liquid using only the force of light, according to a study that will be published Friday.

The French and American physicists used a laser beam to produce a surprisingly long and steady jet of soapy liquid that was narrower than a human hair. When directed at a different angle, it pushed the liquid into a hump-like shape.

It is believed to be the first time a laser had been used to generate bulk flow in fluids.

The discovery could lead to advances in biomedical and biotechnological research by offering a new way to control the flow of fluids through extremely narrow channels.

The discovery was made by accident while University of Chicago professor, Wendy Zhang, was visiting colleagues at the University of Bordeaux.

Zhang, who studies fluids, was invited into a lab where scientist Jean-Pierre Delville had observed a strange and unexpected result after completing a previous experiment involving the behavior of the same fluid under a less intense laser beam.

Delville turned up the laser power just to see what it could do, much the same way a motorist might test the performance of a powerful car on a deserted road.

"He turned up the power and then saw this amazing thing," Zhang said. "Because he has a lot of experience with optics, he realised that what he saw was strange." Zhang took the concept back to Chicago and started working out the theory of what happened with a graduate student, Robert Schroll, who is lead author of the study to be published in the Physical Review Letters on March 30. (AFP)

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