Regensburg 2025 – scientific programme

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O: Fachverband Oberflächenphysik

O 72: Poster Plasmonics and Nanooptics: Light-Matter Interaction, Spectroscopy

O 72.12: Poster

Wednesday, March 19, 2025, 18:00–20:00, P2

Analytical Theory of the Optical Inter- and Intraband Response in Noble Metals — •Robert Lemke, Andreas Knorr, and Jonas Grumm — Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, Technische Universität Berlin, Berlin, Germany

The optical response of plasmonic noble metal nanostructures can be attributed to the interplay of electronic intra- and interband processes described by coupled Boltzmann-Bloch equations. In this set of coupled equations, the specific properties of the noble metal are addressed by an anisotropic electronic dispersion relation expanded in the vicinities of the X and L high symmetry points.

In order to address the dephasing of the inter- and intraband polarizations we consider near equilibrium electron-phonon scattering rates in random phase approximation to estimate relaxation timescales. Our approach allows to connect spectroscopic signatures directly to microscopic processes, not possible with simple Drude-Lorentz models.

Keywords: Intra-/Interband Processes; Anisotropic Electronic Dispersion; Fermi Surface; Plasmonics