SKM 2023 – scientific programme

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O: Fachverband Oberflächenphysik

O 70: Poster: Plasmonics and Nanooptics II

O 70.3: Poster

Wednesday, March 29, 2023, 18:00–20:00, P2/EG

Gold nanoparticles as scannable plasmonic light source for STM enabled electroluminescence — •Cinja S. Müller, Berk Zengin, Aleš Cahlík, and Fabian D. Natterer — Department of Physics, University of Zurich, Winterthurerstrasse 190, CH-8057, Switzerland

The preparation of high quantum yield tips for electroluminescence includes the use of plasmonic metals, by either making tips from wires of coinage metals or coating of tungsten (or Pt/Ir) tips by violent indentation into Au or Ag crystals. While the former appears as the most logical choice, tips made from ductile coinage metals tend to be mechanically unstable. The plunging of tungsten tips into metal substrates, on the other hand, is rather crude and irreproducible. Here, we attempt to use concepts from both extremes by attaching gold nanoparticles (AuNP) onto the apex of tungsten or Pt/Ir tips. We drop-cast commercially available colloidal AuNP onto a graphite substrate from which the AuNP may be transferred to the STM tip by gentle contact. We describe our setup and characterize the electroluminescence using a fiber-coupled single photon counter.