Tapered polymer fiber (IMAGE) Optica Caption Researchers developed tapered polymer optical fibers that are optimized for delivering light to the brain. A scanning electron microscopy image of one of the tapers is shown. Credit Marcello Meneghetti, Technical University of Denmark 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.