Metamaterial Waveguide 3 (IMAGE) Georgia Institute of Technology Caption Georgia Tech researchers (left to right) Shoufeng Lan and Sean Rodrigues adjust optical equipment used to measure the properties of a new metamaterial waveguide. A Georgia Tech research team reported on the creation of a nonlinear material that has opposite refractive indices at the fundamental and harmonic frequencies of light. Credit Courtesy of John Toon, Georgia Tech 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.