Dresden 2020 – scientific programme

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DS: Fachverband Dünne Schichten

DS 30: Poster: Organic Thin Films and Thin Oxides

DS 30.1: Poster

Wednesday, March 18, 2020, 15:00–18:00, P1A

Optical and excitonic properties of molecular aggregates on dielectric surfaces — Fulu Zheng¹, Xing Gao^1,2, •Sidharta Nayak¹, and Alexander Eisfeld¹ — ¹Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Strasse 38, D-01187 Dresden, Germany — ²Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055, USA

Aggregates of fluorescent dye molecules on dielectric surfaces are of great interest for various technological applications. Due to strong interactions between the molecular transition dipoles, the excitonic eigenstates are coherently delocalized over many molecules [1]. These eigenstates and the corresponding optical transitions are determined by the molecular arrangement. We discuss the dependence of dark and bright states on the molecular arrangement and the spatial shape of the electromagnetic radiation used to probe the aggregate [2]. Strongly inhomogeneous fields can be generated via radiation from the apex of a metallic tip, which allows also scanning across the aggregate. Resulting spatially resolved spectra provide extensive information on the eigenenergies and wave functions [2, 3]. We also found that these delocalized eigenfunctions can be directly reconstructed from spatially resolved near field spectra using convolutional neural networks [3].

[1] A. Eisfeld, C. Marquardt, A. Paulheim, and M. Sokolowski, Phys. Rev. Lett. 119, 097402 (2017).

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

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