Peking University research team (IMAGE) Optica Caption (from left) Researchers Haowen Shu, Zihan Tao and Xingjun Wang performing an experiment to test their microwave photonic filter. Credit Peking University research team Usage Restrictions None License Original 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.