37 citations · 131 across the 13 of their papers we have counts for
14 papers
Defect emission and its dipole orientation in layered ternary Znln2S4 semiconductor
Rui Wang, Quan Liu, Sheng Dai +12
Defect engineering is promising to tailor the physical properties of two-dimensional (2D) semiconductors for function-oriented electronics and optoelectronics. Compared with the ex…
Spatially resolved fluorescence of caesium lead halide perovskite supercrystals reveals quasi-atomic behavior of nanocrystals
Dmitry Lapkin, Christopher Kirsch, Jonas Hiller +16
We correlate spatially resolved fluorescence (-lifetime) measurements with X-ray nanodiffraction to reveal surface defects in supercrystals of self-assembled caesium lead halide pe…
Direct observation of structural heterogeneity and tautomerization of single hypericin molecules
Quan Liu, Frank Wackenhut, Liangxuan Wang +6
Tautomerization is a fast chemical reaction where structures of the reactants differ only in the position of a proton and a double bond. Tautomerization often occurs in natural sub…
Periodic Fluorescence Variations of CdSe Quantum Dots Coupled to Aryleneethynylenes with Aggregation Induced Emission
Krishan Kumar, Jonas Hiller, Markus Bender +7
CdSe nanocrystals and aggregates of an aryleneethynylene derivative are assembled into a hybrid thin film with dual fluorescence from both fluorophores. Under continuous excitation…
Structural order matters: Enhanced electronic coupling in self assembled micro-crystals of Au-nanoclusters
Florian Fetzer, Andre Maier, Martin Hodas +6
We report an easy and broadly applicable method for the controlled self-assembly of atomically precise Au32(nBu3P)12Cl8 nanoclusters into micro-crystals. This enables the determina…
Multimode Vibrational Strong Coupling of Methyl Salicylate to a Fabry-Perot Microcavity
Wassie Mersha Takele, Frank Wackenhut, Lukasz Piatkowski +2
The strong coupling of an IR-active molecular transition with an optical mode of the cavity results in vibrational polaritons, which opens a new way to control chemical reactivity…
Hypericin: Single molecule spectroscopy of an active natural ingredient
Quan Liu, Frank Wackenhut, Otto Hauler +4
Hypericin can be found in nature in Hypericum perforatum (St. John's Wort) and has become subject of intense biochemical research. Studies report of antidepressive, antineoplastic,…
Direct phase mapping of the light scattered by single plasmonic nanoparticles
Otto Hauler, Frank Wackenhut, Lukas A. Jakob +5
In this work, we present a novel technique to directly measure the phase shift of the optical signal scattered by single plasmonic nanoparticles in a diffraction-limited laser focu…
Tunable strong coupling of two adjacent optical λ/2 Fabry-Pérot microresonators
Achim Junginger, Frank Wackenhut, Alexander Stuhl +3
Optical half-wave microresonators enable to control the optical mode density around a quantum system and thus to modify the temporal emission properties. If the coupling rate excee…
A Dye-Sensitized CdSe Nanocrystal Optical Transistor with High ON/OFF Ratio in the First Telecom Window with 74 ns Rise Time
Krishan Kumar, Quan Liu, Jonas Hiller +5
We report an optically gated transistor composed of CdSe nanocrystals (NCs), sensitized with the dye Zinc beta-tetraaminophthalocyanine for operation in the first telecom window. T…
Two and three photon excited luminescence of single gold nanoparticles: Switching between plasmon- and electron-hole-pair emission by ultrashort laser pulses
Frank Wackenhut, Xiao Wang, Antonio Virgilio Failla +1
In this work we use femtosecond laser pulses of 800 nm wavelength to excite and characterize the multiphoton luminescence emission of single gold nanoparticles. For excitation with…
Light amplification by stimulated emission from an optically pumped molecular junction in a scanning tunneling microscope
K. Braun, A. M. Kern, X. Wang +5
Here, we introduce and experimentally demonstrate optical amplification and stimulated emission from a single optically pumped molecular tunneling junction of a scanning tunneling…
Coupling of optical far-fields into aperture-less plasmonic nanofibre tips
D. Auwärter, C. Zimmermann, S. Slama
This paper reports on the excitation of surface plasmons on gold-coated nanofibre tips by side-illumination with a laser beam and the coupling of the surface plasmons to the optica…
Electrodynamic coupling of electric dipole emitters to a fluctuating mode density within a nano-cavity
Alexey I. Chizhik, Ingo Gregor, Frank Schleifenbaum +4
We investigate the impact of rotational diffusion on the electrodynamic coupling of fluorescent dye molecules (oscillating electric dipoles) to a tunable planar metallic nanocavity…