Systemically tuning the surface plasmon resonance of high-density silver nanoparticle films Yanchun Gong, Yang Zhou, Longbin He, Bo Xie, Fengqi Song, Min Han and Guanghou Wang Eur. Phys. J. D, 67 4 (2013) 87 Published online: 30 April 2013 DOI: 10.1140/epjd/e2013-30540-9