Complex optical filter prepared by sputter deposition M. H. Asghar, M. Shoaib, Z. M. Khan, F. Placido, S. Naseem and M. Mehmood Eur. Phys. J. Appl. Phys., 49 2 (2010) 20501 Published online: 26 January 2010 DOI: 10.1051/epjap/2009205