Silica Nanorods (IMAGE) Rensselaer Polytechnic Institute Caption To achieve a very low refractive index, silica nanorods are deposited at an angle of precisely 45 degrees on top of a thin film of aluminum nitride. Credit Rensselaer/Fred Schubert Usage Restrictions Include credit line 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.