DNA-Based Thin Films (IMAGE) Optica Caption Researchers have learned to control the index of refraction in organic thin films made out of DNA. Credit Kyunghwan Oh, Yonsei University Usage Restrictions None License Licensed 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.