Berlin 2024 – scientific programme

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O: Fachverband Oberflächenphysik

O 71: Poster: Plasmonics and Nanooptics

O 71.16: Poster

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

Scattering of controlled plasmonic particles configurations on the mirror — •Aleksei Overchenko and Frank Cichos — Leipzig University, Peter Debye Institute for Soft Matter Physics, Linnéstr. 5, 04103 Leipzig

Gold particles have found wide application in sensorics due to their field enhancement propensity that is used for example in Surface-Enhanced Raman Spectroscopy (SERS), Photothermal Therapy and Plasmonic Photovoltaics.

Field enhancement structures can be realised by brining two spheres into proximity, putting a sphere on a mirror or fabricating a bowtie antenna. Surface functionalization often requires complicated modification methods such as lithography and chemical binding, e.g., of DNA origami.

Here, we deliberately manipulate induvial as well as multiple gold particles in front of a gold mirror by local light induced temperature fields generating thermo-osmotic flow fields. We characterize the resulting single, dimeric and higher order clusters, their plasmonic coupling and the coupling of the particles to a thin gold film by scattering spectroscopy. The system is highly reconfigurable as no binding is required and analytes may be bound to the gold film to enable spatially resolved SERS or other field enhancement phenomena.

Keywords: Gold particles; Coupling; Gold mirror; Scattering spectroscopy; Without binding