title: Ultrafast dephasing of surface plasmon excitation in silver nanoparticles: influence of particle size, shape, and chemical surrounding.
abstract: By combination of two special methods, i.e., persistent spectral hole burning and laser assisted nanoparticle preparation, the dephasing time T2 of surface plasmon excitation in silver nanoparticles was systematically investigated. A strong dependence of T2 on the plasmon energy is found which reflects the relevance of interband damping and makes necessary a precise control of the particle shape when measuring T2. The influence of the reduced dimension on the dephasing dynamics was observed as a decrease of T2 with shrinking particle size. In addition, for silver nanoparticles on quartz substrates, a considerable amount of chemical interface damping was observed.
authors.affiliation: Fachbereich Physik, and Center for Interdisciplinary Nanostructure Science and Technology-CINSaT, Universität Kassel, Heinrich-Plett-Strasse 40, Germany. j.bosbach@physik.uni-kassel.de
authors.forename: J
authors.initials: J
authors.lastname: Bosbach
authors.forename: C
authors.initials: C
authors.lastname: Hendrich
authors.forename: F
authors.initials: F
authors.lastname: Stietz
authors.forename: T
authors.initials: T
authors.lastname: Vartanyan
authors.forename: F
authors.initials: F
authors.lastname: Träger