Rechtsman strained photonic crystal (IMAGE) Penn State Caption Scanning electron microscope image of a ‘strained’ photonic crystal. Researchers have now experimentally made light effectively “feel” a magnetic field within the complicated structure of the photonic crystal, which is made of silicon and glass. Credit Rechtsman Laboratory, Penn State Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. No derivatives or adaptations of the work are permitted. License CC BY-NC-ND 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.