An ellipsometric investigation of Ag/SiO2 nanocomposite thin films R. K. Roy, S. K. Mandal, D. Bhattacharyya and A. K. Pal Eur. Phys. J. B, 34 1 (2003) 25-31 Published online: 23 July 2003 DOI: 10.1140/epjb/e2003-00192-5