Ultrafast dephasing of surface plasmon excitation in silver nanoparticles: influence of particle size,shape, and chemical surrounding |
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Authors: | Bosbach J Hendrich C Stietz F Vartanyan T Träger F |
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Institution: | Fachbereich Physik, and Center for Interdisciplinary Nanostructure Science and Technology-CINSaT, Universit?t Kassel, Heinrich-Plett-Strasse 40, Germany. j.bosbach@physik.uni-kassel.de |
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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. |
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