Search

Your search keyword '"Marvin F. Schumacher"' showing total 3 results
Start Over Author "Marvin F. Schumacher"
3 results on '"Marvin F. Schumacher"'

2. Plasmon mediated coherent population oscillations in molecular aggregates

Author

Daniel Timmer, Moritz Gittinger, Thomas Quenzel, Sven Stephan, Yu Zhang, Marvin F. Schumacher, Arne Lützen, Martin Silies, Sergei Tretiak, Jin-Hui Zhong, Antonietta De Sio, and Christoph Lienau

Subjects
Science
Abstract

Abstract The strong coherent coupling of quantum emitters to vacuum fluctuations of the light field offers opportunities for manipulating the optical and transport properties of nanomaterials, with potential applications ranging from ultrasensitive all-optical switching to creating polariton condensates. Often, ubiquitous decoherence processes at ambient conditions limit these couplings to such short time scales that the quantum dynamics of the interacting system remains elusive. Prominent examples are strongly coupled exciton-plasmon systems, which, so far, have mostly been investigated by linear optical spectroscopy. Here, we use ultrafast two-dimensional electronic spectroscopy to probe the quantum dynamics of J-aggregate excitons collectively coupled to the spatially structured plasmonic fields of a gold nanoslit array. We observe rich coherent Rabi oscillation dynamics reflecting a plasmon-driven coherent exciton population transfer over mesoscopic distances at room temperature. This opens up new opportunities to manipulate the coherent transport of matter excitations by coupling to vacuum fields.

Published
2023
Full Text
View/download PDF

3. The Impact of Chiral Citronellyl-Functionalization on Indolenine and Anilino Squaraine Thin Films

Author

Sara Mattiello, Manuela Schiek, Klaus Meerholz, Matthias Schulz, Marvin F. Schumacher, Frank Balzer, Arne Lützen, Luca Beverina, Jennifer Zablocki, Marc Schmidtmann, N. Serdar Sariciftci, Balzer, F, Schumacher, M, Mattiello, S, Schulz, M, Zablocki, J, Schmidtmann, M, Meerholz, K, Serdar Sariciftci, N, Beverina, L, Lutzen, A, and Schiek, M

Subjects
Circular dichroism, Chemistry, squaraine, Surface modification, General Chemistry, Thin film, charge-transfer exciton, Photochemistry, Micro morphology, micro-morphology, circular dichroism
Abstract

The impact on chiral aggregation in solution processed and thermally annealed thin films of two indolenine and one anilino squaraines with chiral (S)-citronellyl functionalization at the nitrogen of the squaraine backbone is investigated. A pseudo polymorphic crystal structure is obtained for one of the indolenine squaraines, but thin films of both compounds are basically non-aggregated and truly isotropic as evidenced by spectroscopic ellipsometry. The anilino squaraine coalesces and readily aggregates to circular dichroic but discontinuous thin films. The extent of circular dichroism correlates with the morphology of the samples, which is quantified by Mueller matrix polarimetry in combination with atomic force microscopy. The shape of the CD spectra reinforces the hybrid Frenkel and charge-transfer excitonic nature of the characteristic double hump signatures within unpolarized absorbance spectra of previously investigated non-chiral anilino squaraines with linear alkyl chain functionalization. Such excitonic CD offers an additional design parameter for next-generation opto-electronic devices.

Published
2022

Catalog

Books, media, physical & digital resources
See catalog results