Erlangen 2022 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 64: Nano-Optics III

Q 64.1: Talk

Friday, March 18, 2022, 10:30–10:45, Q-H11

Extinction spectroscopy of ellipsoidal nanoparticles — •Mathis Noell and Carsten Henkel — Universität Potsdam, Institut für Physik und Astronomie

Plasmonic nanostructures provide an interesting platform to enhance the spectroscopy of molecules. If a nanoparticle is covered with a thin absorbing layer, theory predicts certain resonances that are not seen in experimental extinction spectra [1, 2]. To understand this issue, we analyse the distribution of electric fields and of energy dissipation in and around an ellipsoidal nanoparticle. Calculations are done for gold particles covered with a few nm thick layer. At the spurious resonance, the field is highly localised in this layer, suggesting that strong coupling to the molecular exciton is possible at the few-photon level. We compare the impact of different effective medium approaches on the calculated spectra.

[1] F. Stete et al., “Vacuum Induced Saturation in Plasmonic Nanoparticles,” arXiv:2008.09395.

[2] T. J. Antosiewicz, S. P. Apell, and T. Shegai, “Plasmon–Exciton Interactions in a Core–Shell Geometry: From Enhanced Absorption to Strong Coupling,” ACS Photonics 1, 454 (2014).