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O: Fachverband Oberflächenphysik

O 66: Poster: Nanostructures at Surfaces

O 66.13: Poster

Wednesday, March 20, 2024, 18:00–20:00, Poster C

Plasmonic nanoparticles on silicon: photoemission characteristics and control — •Waqas Pervez, Kevin Oldenburg, Sylvia Speller, and Ingo Barke — Institute of Physics, University of Rostock

Laser excitation of localized plasmons in nanoparticles can give rise to a vastly enhanced photoemission yield [1, 2]. Here we study detailed characteristics of the photoelectron emission process of size-selected nanoparticles with diameters around 10 nm, deposited from the gas phase on silicon. To this end we employ femtosecond laser excitation in a photoemission electron microscope (PEEM). The emission intensity is investigated as a function of space, emission angles, laser wavelength and polarization. We discuss how these parameters can be used to control the electron emission from individual particles. Furthermore, we propose experiments based on a two-color setup which should enable various excitation schemes and reveal phase effects leading to anisotropic electron emission, in analogy to the case of free particles [3].

[1] M. Rohmer et al., Phys. Stat. Solidi B 247, 1132 (2010)

[2] K. Oldenburg et al., J. Phys. Chem. C 123, 1379 (2019)

[3] J. Passig et al., Nat. Commun. 8, 1181 (2017)

Keywords: nanoparticles; PEEM; plasmon