A Phononic Crystal Device (image) Academy of Finland Caption A phononic crystal device fabricated in silicon nitride (SiN) using electron-beam lithography. Green = SiN, blue and red lines = aluminium and copper heaters and thermometers, and black areas = holes. Credit University of Jyväskylä Usage Restrictions None 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.