Erlangen 2022 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 4: Electronic II
MO 4.1: Vortrag
Dienstag, 15. März 2022, 10:30–10:45, MO-H5
Near-Field scanning optical microscopy of molecular aggregates: the role of light polarization — •Sidhartha Nayak1, Fulu Zheng2, and Alexander Eisfeld1 — 1MPIPKS, Dresden, Germany — 2BCCMS, University of Bremen, Bremen, Germany
Strong Interaction between transition dipoles of molecules leads to formation of delocalized excitonic eigenstates of molecular aggregates. Using a scattering scanning near-field optical microscope setup one can record position dependent absorption spectra[1] from which we can reconstruct the wavefunctions[2]. In this contribution we focus on the dependence of the spectra on the direction and polarization of the incoming electromagnetic radiation, which induces a Hertz dipole with a specific orientation at the tip-apex. Within a simple description based on the eigenstates of the aggregate, We find that the spatial patterns of the spectra have a strong dependence on the orientation of this tip-dipole, which can be understood by considering three basic functions that only depend on the arrangement of the aggregate and the molecule-tip distance, but not on the orientation of the tip-dipole[3]. This approach is validated by a more detailed description where the incoming radiation and the interaction between tip and molecules is explicitly taken into account.
[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)
[3] S. Nayak, F. Zheng and A. Eisfeld, J. Chem. Phys. 155, 134701 (2021)