Defect (IMAGE) University of Massachusetts Amherst Caption Figure at left illustrates the defect area of photonic crystal bumps introduced into the lower middle area of the microring structure. Image at right shows what the defect looks like in practice. 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.