Size-dependent correlation effects in the ultrafast optical dynamics of metal nanoparticles
- 15 September 1999
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 60 (12), 9090-9099
- https://doi.org/10.1103/physrevb.60.9090
Abstract
We study the role of collective surface excitations in electron relaxation in small metal particles. We show that dynamically screened electron-electron interaction in a nanoparticle contains a size-dependent correction induced by the surface. This leads to channels of quasiparticle scattering accompanied by the emission of surface collective excitations. We calculate the energy and temperature dependence of the corresponding rates, which depend strongly on the nanoparticle size. We show that the surface-plasmon-mediated scattering rate of a conduction electron increases with energy, in contrast to that mediated by a bulk plasmon. In noble-metal particles, we find that the dipole collective excitations (surface plasmons) mediate a resonant scattering of d holes to the conduction band. We show that, with decreasing nanoparticle size, the latter effect leads to a strong frequency dependence of the relaxation near the surface-plasmon resonance, while for even smaller sizes of a few nanometers we predict a drastic change in the differential absorption line shape. The experimental implications of our results in ultrafast spectroscopy are discussed.Keywords
This publication has 31 references indexed in Scilit:
- Electron Dynamics in Copper Metallic Nanoparticles Probed with Femtosecond Optical PulsesPhysical Review Letters, 1995
- Ultrafast electron dynamics at the liquid–metal interface: Femtosecond studies using surface plasmons in aqueous silver colloidThe Journal of Chemical Physics, 1995
- Optical Properties of Metal ClustersSpringer Series in Materials Science, 1995
- Subpicosecond time response of third-order optical nonlinearity of small copper particles in glassApplied Physics Letters, 1994
- Size dependence of the third-order susceptibility of copper nanoclusters investigated by four-wave mixingJournal of the Optical Society of America B, 1994
- The physics of simple metal clusters: experimental aspects and simple modelsReviews of Modern Physics, 1993
- The physics of simple metal clusters: self-consistent jellium model and semiclassical approachesReviews of Modern Physics, 1993
- T-matrix approach to the nonlinear susceptibilities of heterogeneous mediaPhysical Review A, 1988
- Optical nonlinearities of small metal particles: surface-mediated resonance and quantum size effectsJournal of the Optical Society of America B, 1986
- Electronic Properties of Fine Metallic Particles. II. Plasma Resonance AbsorptionJournal of the Physics Society Japan, 1966