PhotonicDevice (IMAGE) Texas A&M University Caption Aluminum nitride optical waveguide carries the laser beam to a test sample. Scattered light reveals the sample's Raman molecular fingerprint. Credit Texas A&M University College of Engineering Usage Restrictions None License Licensed content 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.