Topview (IMAGE) University of Massachusetts Amherst Caption Electromagnetic field simulation looking down at the top of the microring shows how the defect is localized to a region smaller than the entirety of the ring. Credit NIST/Lu 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.