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O: Fachverband Oberflächenphysik

O 24: Poster Session II: Plasmonics and nanooptics II

O 24.8: Poster

Montag, 1. März 2021, 13:30–15:30, P

Dependency of aggregate absorption on near field polarization — •Sidhartha Nayak¹, Fulu Zheng², and Alexander Eisfeld¹ — ¹Max Planck Institute for the Physics of Complex Systems, Dresden, Germany — ²Bremen Center for Computational Materials Science, University of Bremen, Bremen, Germany

Strong interaction between transition dipoles of molecules leads to the formation of delocalized excitonic eigenstates of molecular aggregates. To understand their optical and transfer properties, knowledge of these eigenstates is required. Using near-field radiation stemming from a metallic tip which is scanned over the aggregate one can record position-dependent absorption spectra [1]. From these spectra, it is possible to reconstruct excitonic wavefunction [2]. In this contribution, we focus on the situation when the tip is irradiated by linear polarized light. We show that there is a strong dependence of the near field spectra on the polarization and propagation direction of the incident light, which can be used to facilitate the wavefunction reconstruction. Finally, we explain this orientation dependency using three basic functions which depend on tip position and eigenfunctions but not on the orientation of the incoming radiation.

[1] X. Gao and A. Eisfeld, J. Phys. Chem. Lett. 9, 6003 (2018)

[2] F. Zheng, X. Gao and A. Eisfeld, Phys. Rev. Lett. 123, 163202 (2019)