Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 59: Poster Wednesday: Plasmonics and Nanooptics 2

O 59.6: Poster

Mittwoch, 7. September 2022, 18:00–20:00, P4

Photoemission electron microscopy of Ag nanostructures on silicon substrates — •Muhamed Sewidan, Katharina Engster, Kevin Oldenburg, Sylvia Speller, and Ingo Barke — Rostock University, Rostock, Germany

We study electronic and optical coupling phenomena between plasmonic nano-objects, organic molecules, and the substrate. Localized plasmons created in metal nanostructures can lead to enhanced multiphoton photoelectron emission under pulsed light excitation. In a photoemission electron microscope (PEEM) individual particles of sub-15 nm size can be easily distinguished, providing access to the single-particle plasmon properties for a large number of species simultaneously [1]. We present results on the spatially resolved photoemission dependence on wavelength, polarization, and the surface composition for size-selected Ag particles and nanostructure arrays prepared by nanosphere lithography on silicon. [1] K. Oldenburg et al., J. Phys. Chem. C 123, 1379 (2019)