Ping Zhao. (IMAGE) Chalmers University of Technology Caption Dr Ping Zhao, researcher at the Photonics Laboratory, Department of Microtechnology and Nanoscience, Chalmers University of Technology, Sweden. Credit Yan Hu/Chalmers University of Technology Usage Restrictions Credit must be given to the creator. License CC BY 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.