Studying Gallium Nitride Devices (IMAGE) Georgia Institute of Technology Caption Researchers Cheng Zhe and Samuel Graham shown with an optical test setup for studying gallium nitride devices cooled by placement on a diamond substrate. Credit Rob Felt, Georgia Tech Usage Restrictions None 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.