Spread of light (IMAGE) University of Münster Caption The spread of light in a matrix made of phase change materials - the principle of the photonic processor (schematic diagram) Credit AG Pernice - xvivo Usage Restrictions The use of this photo is permitted exclusively in connection with this press release and under indication of the source. 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.