Resonance shifts and spill-out effects in self-consistent hydrodynamic nanoplasmonics
报告人：Giuseppe Toscano（Institute of Theoretical Solid State Physics, Karlsruhe Institute of Technology (KIT), Kalrsuhe, Germany）
报告时间：2015.10.16（周五）下午16:00
The ongoing miniaturization of nanoplasmonic structures down to sizes comparable to the Fermi wavelength of the electrons, calls for a description that captures the emerging quantum effects. To this end, we proposed the use of the Hydrodynamic Drude Model with hard-wall boundary conditions (HW-HDM), which has proven to give accurate quantitative predictions for the optical response of noble-metal nanoparticles. However, the HW-HDM fails to describe other metallic nanosystems, where surface effects due to electron density spill-out in free space cannot be neglected. Here I will survey a more general formulation of the hydrodynamic model called Self-Consistent Hydrodynamic Model (SC-HDM), which allows to determine self-consistently both the ground state and excited state properties of a generic electronic system. In this new context, spill-out effects arise naturally. I will discuss the implementation of this model as an add-on to standard commercial software (COMSOL 4.4), and I will show the results obtained for both sodium and silver nanoparticles. The accuracy of the SC-HDM is comparable with that of fully quantum mechanical methods, and it allows to treat large systems that are of interest in the plasmonic applications.
Giuseppe Toscano was born in Caserta, Italy in 1982. He obtained a BSc' s degree in Electrical Engineering from the University of Naples in 2005 and a MSc' s degree in Engineering Science from the University of Rome in 2008. In 2009 he was a PhD student in Prof. Mortensen's group at the Technical University of Denmark (DTU). He obtained his PhD in physics in 2013 with a thesis on nonlocal effects in plasmonic nanostructures. In 2013 he worked as postdoc in Prof. Xu' s group at Wuhan University. From 2014 he works as postdoc at the Karlrsuhe Institute of Technology (KIT) in Karlsruhe (Germany) in Prof. Rockstuhl's group.
