Spiral Wavefront (IMAGE) University of Innsbruck Caption The spiral wavefront of the elliptically polarized light hits the lens at a slight angle, leading to the impression that the source of the light is somewhat off its actual position. Credit IQOQI Innsbruck/Harald Ritsch Usage Restrictions The picture may be used for editorial purposes only. It is protected by copyright. The use is free of charge if the reference is mentioned. 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.