Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 83: Focus Session: Novel Approaches to Surface Plasmon Generated Charges and Heat for Photocatalysis II (joint session O/CPP)

O 83.10: Vortrag

Donnerstag, 21. März 2024, 13:00–13:15, MA 141

Anisotropic core-shell particles in the strong coupling regime — •Mathis Noell and Carsten Henkel — Universität Potsdam, Institut für Physik und Astronomie, Germany

Plasmonic particles coated with resonant organic absorbers (e.g., J-aggregates) provide a versatile platform to observe strong coupling. Calculations using Mie theory result, however, in the prediction of a “spurious” unobserved absorption peak between the upper and lower polariton [1]. The spurious resonance was previously thought to be caused by a negative value of the shell permittivity [2]. Alternatively, recent literature has shown that power broadening of the exciton transition efficiently suppresses the spurious resonance [3]. We demonstrate, using a modified Tavis-Cummings model, that the assumption of an isotropic shell material leads to the excitation of plasmonic dark modes (PDM) by an external field and, consequently, to an absorption line located between the upper and lower polariton. Anisotropic transition dipoles with a fixed orientation relative to the particle surface can fully suppress the coupling between the PDM and the illumination field.

[1] T. Uwada, R. Toyota, H. Masuhara, and T. Asahi, J. Phys. Chem. C 111 (2007) 1549.

[2] T. J. Antosiewicz, S. P. Apell, and T. Shegai, ACS Photonics 1 (2014) 454.

[3] F. Stete, W. Koopman, G. Kewes, C. Henkel, O. Benson, and M. Bargheer ACS Photonics 10 (2023) 2511.

Keywords: Strong Coupling; Plasmon; Anisotropy; Extinction; Core-Shell Particles