title: Nonlinear response of metal nanoparticles: Double plasmon excitation and electron transfer.
abstract: We investigate the dynamical response of a metal nanoparticle and the electron transfer to a molecule near its surface using time-dependent density functional theory. In addition to the linear response of the Mie resonance, double plasmon excitations and a low-frequency charge transfer band emerge and become prominent at high laser intensities. Both modes are nonlinear processes, which are derived from the re-excitation and decay of the primary plasmon mode, respectively. Our results shed light on the localised characters of the plasmon-molecule coupling and hot electron distributions. These findings have general implications to photoinduced phenomena in nanosystems.
authors.affiliation: Beijing Computational Science Research Center, Zhongguancun Software Park II, 100094, Beijing, China.
authors.forename: Shiwu
authors.initials: S
authors.lastname: Gao