Thin Photo Detector 2 (IMAGE) University of Wisconsin-Madison Caption UW–Madison electrical and computer engineering graduate student Zhenyang Xia holds a dish containing photodetector samples. The sample colors vary depending on how they are tuned to absorb a specific light wavelength. Photo: Stephanie Precourt/UW–Madison Credit Photo: Stephanie Precourt/UW–Madison Usage Restrictions Credit Stephanie Precourt/UW-Madison 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.