Low loss GaN waveguides for visible light on Si substrates M. Gromovyi, F. Semond, J. Y. Duboz, G. Feuillet and M. P. De Micheli J. Eur. Opt. Soc.-Rapid Publ., 9 (2014) 14050 Published online: 18 November 2014 DOI: 10.2971/jeos.2014.14050