Photonic Microcapsules (image) Harvard University Caption These photonic microcapsules have been prepared to produce blue, green, and red structural colors and imaged using bright-field (top) and dark-field (bottom) optical microscopy. Credit Images courtesy of Jin-Gyu Park, Harvard School of Engineering and Applied Sciences. 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.