Berlin 2018 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 22: Optical Analysis of Thin Films (Reflection, Ellipsometry, Raman, IR-DUV Spectroscopy, ...): Session II
DS 22.1: Vortrag
Mittwoch, 14. März 2018, 15:00–15:15, H 0111
Giant Circular Dichroism of Enantiopure Prolinol-Derived Squaraine J-Aggregate Thin Films probed by Mueller Matrix Spectroscopy — •Manuela Schiek1, Matthias Schulz2, Jennifer Zablocki2, Oliya S. Abdullaeva1, Arne Lützen2, Frank Balzer3, and Oriol Arteaga4 — 1University of Oldenburg, D. — 2University of Bonn, D — 3University of Southern Denmark, Sonderborg, DK — 4University of Barcelona, ES
We have achieved sizable ex-chiral-pool synthesis of enantiopure prolinol functionalized squaraine small molecular compounds with opposite handedness. The aggregation into intrinsically circular dichroic, molecular J-aggregates with quasimetallic reflection is controlled by thermal annealing. By Mueller matrix spectroscopy [1] we show an extraordinary high but true circular dichroism in spincasted thin films spectrally located at 780 nm. The ellipticity well reaches a value of 500 mdeg/nm and an intensive dissymmetry factor of 0.75, respectively, and is evenly distributed over the complete thin film area. So far, these values have no documented rival among intrinsic supramolecular circular dichroism, and thereby are revolutionary for the development of organic based chiral photonics and spintronics. [1] O. Arteaga, B. Kahr, Opt. Lett. 38 (2013) 1134.