Concept illustration (IMAGE) Imperial College London Caption Laser light (red) propagates in a tapered optical fibre and is coupled into a whispering-gallery-mode microresonator where it circulates up to a million times. As the light circulates it interacts with high-frequency acoustic waves Credit Image credit: project co-author Jack Clarke (www.qmeas.net) 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.