Berlin 2024 – scientific programme

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O: Fachverband Oberflächenphysik

O 71: Poster: Plasmonics and Nanooptics

O 71.14: Poster

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

Contrast Mechanism Investigation of Single Core-shell Nanoparticles in s-SNOM Using Finite Element Simulations — •Dinghe Dai, Dario Siebenkotten, Richard Ciesielski, and Bernd Kästner — Physikalisch-Technische Bundesanstalt, Abbestr. 2-12, 10587 Berlin

Scattering-type scanning near-field optical microscopy (s-SNOM) is a widely used technique for nanoscale characterization of surface structures, surface polaritons, and biomolecular systems. Recently, core-shell nanoparticles have gained increasing interest in the fields of medical and material sciences. To investigate the properties of single core-shell nanoparticles using s-SNOM, we simulate the near-field contrast characterized by different geometrical and optical properties with the finite element method using the commercial software JCMSuite. We observe different resonances, which shift according to the geometrical properties. Field distribution plots indicate that these resonances may orignate from the interaction between the nanoparticle and the tip as well as between the nanoparticle and the substrate. The simulation results demonstrate the fundamental ability to determine geometrical and optical properties of individual nanoparticles using s-SNOM.

Keywords: Core-shell nanoparticle; s-SNOM; FEM