Changing Polarization of Light (image) University at Buffalo Caption The direction that a light wave is oscillating changes as the wave is reflected by a sheet of graphene. This changing direction of oscillation -- also known as polarization -- enabled researchers to identify the electronic properties of multiple sheets of graphene stacked atop one another -- even when they were covering each other up. Credit Chul Soo Kim, U.S. Naval Research Laboratory Usage Restrictions This image may only be used in conjunction with news stories covering the associated research. 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.