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O: Fachverband Oberflächenphysik
O 24: Plasmonics and Nanooptics III: Light-Matter Interaction and Spectroscopy
O 24.10: Talk
Tuesday, March 19, 2024, 12:45–13:00, MA 042
A microscopic approach for active plasmonics in THz-pumped metal nanoparticles — •Jonas Grumm1, Robert Salzwedel1, Holger Lange2, and Andreas Knorr1 — 1Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, Technische Universität Berlin, Berlin, Germany — 2Institut für Physikalische Chemie, Universität Hamburg, Hamburg, Germany
The optical response of metal nanoparticles is dominated by the formation of collective electronic resonances, forming localized plasmons. To gain insight into their dynamics and for switching applications, it would be beneficial to influence the plasmonic resonance actively.
Here, we present theoretical models for an active tuning of the plasmonic resonance in optical spectra by using strong THz fields. We discuss theoretical descriptions with different complexity, ranging from a numerical solution of kinetic equations for the electron dynamics to coarse-grained hydrodynamic descriptions of metal nanoparticles. In all cases, we merge the electron dynamics and Maxwell's equations to obtain self-consistent solutions. A renormalization of the optical metal nanoparticle plasmon resonance by the THz field can be realized by THz-induced spatial gradients.
Keywords: Active Plasmonics; Hydrodynamic Model; Plasmon Dynamics; THz Radiation