Stretching and twisting a bright idea | Science News

Support Science Journalism

Science News is a nonprofit.

Support us by subscribing now.


Stretching and twisting a bright idea

9:53am, May 30, 2001

A typical laser produces one color of light with superb precision. Only uncommon, expensive lasers can be tuned to emit several colors. Nonetheless, both researchers and technology developers are finding more and more uses for tunable lasers.

Now, along comes a laser that changes color as easily as a rubber band stretches.

A team of German, U.S., Mexican, and Korean researchers has developed the heart of this laser: rubbery, translucent membranes made from liquid crystal molecules interspersed with dye particles. When stimulated by a conventional laser, such membranes produce laser light themselves. Moreover, when stretched, they shift the color of the light to shorter wavelengths. For instance, a relaxed membrane might make red light, but a taut one, green light. An account of the research is slated for a forthcoming issue of Advanced Materials.

Within the membranes, liquid-crystal molecules are oriented like the steps of a spiral staircase, says Antonio

This article is only available to Science News subscribers. Already a subscriber? Log in now.
Or subscribe today for full access.

Get Science News headlines by e-mail.

More from Science News

From the Nature Index Paid Content