243 citations · 528 across the 23 of their papers we have counts for
26 papers
Picosecond time-resolved antibunching measures nanoscale exciton motion, annihilation, and true number of chromophores
Gordon J. Hedley, Tim Schröder, Florian Steiner +8
The particle-like nature of light becomes evident in the photon statistics of fluorescence of single quantum systems as photon antibunching. In multichromophoric systems, exciton d…
Characterizing ultrashort laser pulses with second harmonic dispersion scans
Ivan Sytcevich, Chen Guo, Sara Mikaelsson +9
The dispersion scan (d-scan) technique has emerged as a simple-to-implement characterization method for ultrashort laser pulses. D-scan traces are intuitive to interpret and retrie…
A high-repetition rate attosecond light source for time-resolved coincidencespectroscopy
Sara Mikaelsson, Jan Vogelsang, Chen Guo +12
Attosecond pulses, produced through high-order harmonic generation in gases, have been successfully used for observing ultrafast, sub-femtosecond electron dynamics in atoms, molecu…
Few-cycle lightwave-driven currents in a semiconductor at high repetition rate
Fabian Langer, Yen-Po Liu, Zhe Ren +9
When an intense, few-cycle light pulse impinges on a dielectric or semiconductor material, the electric field will interact nonlinearly with the solid, driving a coherent current.…
Interchromophoric Interactions Determine the Maximum Brightness Density in DNA Origami Structures
Tim Schröder, Max B. Scheible, Florian Steiner +2
An ideal point light source is as small and as bright as possible. For fluorescent point light sources, homogeneity of the light sources is important as well as that the fluorescen…
Controlling the Photoelectric Effect in the Time Domain
Yu-Chen Cheng, Sara Mikaelsson, Saikat Nandi +9
When an atom or molecule absorbs a high-energy photon, an electron is emitted with a well-defined energy and a highly-symmetric angular distribution, ruled by energy quantization a…
Spatio-temporal coupling of attosecond pulses
Hampus Wikmark, Chen Guo, Jan Vogelsang +12
The shortest light pulses produced to date are of the order of a few tens of attoseconds, with central frequencies in the extreme ultraviolet range and bandwidths exceeding tens of…
Determining the True Optical Gap in a High-Performance Organic Photovoltaic Polymer Using Single-Molecule Spectroscopy
Gordon J. Hedley, Florian Steiner, Jan Vogelsang +1
Low-gap conjugated polymers have enabled an impressive increase in the efficiencies of organic solar cells, primarily due to their red absorption which allows harvesting of that pa…
Role of Triplet-State Shelving in Organic Photovoltaics: Single-Chain Aggregates of Poly(3-hexylthiophene) versus Mesoscopic Multichain Aggregates
Florian Steiner, John M. Lupton, Jan Vogelsang
Triplet excitons have been the focus of considerable attention with regards to the functioning of polymer solar cells, because these species are long-lived and quench subsequently…
Watching charge separation in nanoantennas by ultrafast point-projection electron microscopy
Jan Vogelsang, Germann Hergert, Dong Wang +2
Watching the motion of electrons on their natural nanometre length- and femtosecond time scales is a fundamental goal and an open challenge of contemporary ultrafast science. Optic…
Spectral focusing of broadband silver electroluminescence in nanoscopic FRET-LEDs
Robin P. Puchert, Florian Steiner, Gerd Plechinger +10
Few inventions have shaped the world like the incandescent bulb. While Edison used thermal radiation from ohmically heated conductors, some noble metals exhibit "cold" electrolumin…
Molecular polygons probe the role of intramolecular strain in the photophysics of pi-conjugated chromophores
P. Wilhelm, J. Vogelsang, G. Poluektov +5
Pi-conjugated segments - chromophores - constitute the electronically active units of polymer materials used in organic electronics. To elucidate the effect of bending of these lin…
Interactions between pi-conjugated chromophores in a giant molecular spoked wheel
D. Wuersch, R. May, G. Wiederer +4
We discuss the intriguing photophysics of a giant molecular spoked wheel of pi-conjugated arylenealkynylene chromophores on the single-molecule level. This "molecular mesoscopic" t…
Differentiation between shallow and deep charge trap states on single poly(3-hexylthiophene) chains through fluorescence photon statistics
Kristin S. Grussmayer, Florian Steiner, John M. Lupton +2
Blinking of the photoluminescence (PL) emitted from individual conjugated polymer chains is one of the central observations made by single-molecule spectroscopy (SMS). Important in…
Mesoscopic Quantum Emitters from Deterministic Aggregates of Conjugated Polymers
Thomas Stangl, Philipp Wilhelm, Klaas Remmerssen +3
An appealing definition of the term "molecule" arises from consideration of the nature of fluorescence, with discrete molecular entities emitting a stream of single photons. We add…
Molecular Water Lilies: Orienting Single Molecules in a Polymer Film by Solvent Vapor Annealing
Dominik Wuersch, Felix J. Hofmann, Theresa Eder +5
The microscopic orientation and position of photoactive molecules is crucial to the operation of optoelectronic devices such as OLEDs and solar cells. Here, we introduce a shape-pe…
Impact of charge carrier injection on single-chain photophysics of conjugated polymers
Felix J. Hofmann, Jan Vogelsang, John M. Lupton
Charges in conjugated polymer materials have a strong impact on the photophysics and their interaction with the primary excited state species has to be taken into account in unders…
Fluctuating exciton localisation in giant pi-conjugated spoked-wheel macrocycles
Vikas Aggarwal, Alexander Thiessen, Alissa Idelson +8
Conjugated polymers offer potential for many diverse applications but we still lack a fundamental microscopic understanding of their electronic structure. Elementary photoexcitatio…
Temporal fluctuations in excimer-like interactions between pi-conjugated chromophores
Thomas Stangl, Philipp Wilhelm, Daniela Schmitz +5
Inter- or intramolecular coupling processes between chromophores such as excimer formation or H- and J-aggregation are crucial to describing the photophysics of closely packed film…
Unraveling the chromophoric disorder of poly(3-hexylthiophene)
Alexander Thiessen, Jan Vogelsang, Takuji Adachi +3
The spectral breadth of conjugated polymers gives these materials a clear advantage over other molecular compounds for organic photovoltaic applications and is a key factor in rece…
Exciton Localization in Extended π-electron Systems: Comparison of Linear and Cyclic Structures
Alexander Thiessen, Dominik Würsch, Stefan-S. Jester +6
We employ five π-conjugated model materials of different molecular shape --- oligomers and cyclic structures --- to investigate the extent of exciton self-trapping and torsional mo…
Multipass laser cavity for efficient transverse illumination of an elongated volume
Jan Vogelsang, Marc Diepold, Aldo Antognini +11
A multipass laser cavity is presented which can be used to illuminate an elongated volume from a transverse direction. The illuminated volume can also have a very large transverse…
Spontaneous fluctuations of transition dipole moment orientation in OLED triplet emitters
Florian Steiner, Sebastian Bange, Jan Vogelsang +1
The efficiency of an organic light-emitting diode (OLED) depends on the microscopic orientation of transition dipole moments of the molecular emitters. The most effective materials…
Singlet-triplet annihilation limits exciton yield in poly(3-hexylthiophene)
Florian Steiner, Jan Vogelsang, John M. Lupton
Control of chain length and morphology in combination with single-molecule spectroscopy techniques provide a comprehensive photophysical picture of excited-state losses in the prot…