Piezo-Phototronic LED (2 of 2) (image) Georgia Institute of Technology Caption Researchers have developed a sensor device that converts mechanical pressure -- from a signature or a fingerprint -- directly into light signals that can be captured and processed optically. Shown are Professor Zhong Lin Wang of the Georgia Institute of Technology and his research team. Credit Georgia Tech Photo: Gary Meek Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.