Path of Photons (IMAGE) Duke University Caption This is the central part of the new photonic crystal topological insulator waveguide, with the path of a photon's path highlighted in green. The experiment showed that each turn resulted in backscattering losses of only a few percent. Credit Natasha Litchinitser, Duke 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.