Prof. Rudolf Bratschitsch Profile

Prof. Rudolf Bratschitsch

Professor at Univ Münster

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Publications (8)

Proceedings Article | 4 October 2023 Presentation

Efficient light harvesting from single-photon emitters in 2D materials

Rudolf Bratschitsch

Proceedings Volume PC12647, PC126470B (2023) https://doi.org/10.1117/12.2676666

KEYWORDS: Quantum emitters, 2D materials, Photons, Light harvesting, Waveguides, Quantum light, Nanocrystals, Quantum technologies, Quantum sources, Polymers

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Proceedings Article | 28 September 2023 Presentation

Broadband high-performance Faraday rotation spectroscopy of 2D materials and thin magnetic films

Rudolf Bratschitsch

Proceedings Volume PC12656, PC126561L (2023) https://doi.org/10.1117/12.2676664

KEYWORDS: Magnetism, Spectroscopy, Thin films, 2D materials, Spectroscopes, Polarization, Modulation, Excitons, Spintronics, Spectral response

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Proceedings Article | 4 October 2022 Presentation

Ultrafast spintronic THz emitters (Conference Presentation)

Rudolf Bratschitsch

Proceedings Volume PC12205, PC1220508 (2022) https://doi.org/10.1117/12.2633298

KEYWORDS: Terahertz radiation, Spintronics, Ultrafast phenomena, Magnetism, Platinum, Solid state physics, Multilayers, Metals

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Proceedings Article | 1 August 2021 Presentation + Paper

Integration of colloidal quantum dots with nanophotonic circuits

A. Eich, T. Spiekermann, L. Sommer, H. Gehring, J. Bankwitz, J. Preuss, J. Kern, S. Michaelis de Vasconcellos, R. Bratschitsch, W. H. Pernice, C. Schuck

Proceedings Volume 11806, 1180607 (2021) https://doi.org/10.1117/12.2594694

KEYWORDS: Waveguides, Nanophotonics, Quantum dots, Confocal microscopy, Tantalum, Quantum communications, Interfaces

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Proceedings Article | 29 August 2017 Presentation + Paper

Biaxial strain in atomically thin transition metal dichalcogenides

Riccardo Frisenda, Robert Schmidt, Steffen Michaelis de Vasconcellos, Rudolf Bratschitsch, David Perez de Lara, Andres Castellanos-Gomez

Proceedings Volume 10353, 103530N (2017) https://doi.org/10.1117/12.2274756

KEYWORDS: Reflectance spectroscopy, Optical properties, Transition metals, Polymers, Real time imaging, Semiconductors

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Proceedings Article | 4 November 2016 Presentation

Ultrafast valley dynamics in atomically thin transition metal dichalcogenides (Conference Presentation)

Rudolf Bratschitsch

Proceedings Volume 9931, 99313D (2016) https://doi.org/10.1117/12.2239329

KEYWORDS: Transition metals, Semiconductors, Polarization, Luminescence, Signal processing, Ultrafast phenomena, Visible radiation, Infrared radiation, Optoelectronics, Light scattering

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Proceedings Article | 2 March 2010 Open Access

Femtosecond quantum optics with semiconductor nanostructures: single cycles of light, electrons, and photons

A. Leitenstorfer, R. Huber, R. Bratschitsch

Proceedings Volume 7600, 760002 (2010) https://doi.org/10.1117/12.847159

KEYWORDS: Photons, Picosecond phenomena, Femtosecond phenomena, Terahertz radiation, Electrons, Quantum dots, Quantum optics, Polarization, Excitons, Polaritons

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Recent advances of femtosecond semiconductor physics at the limits of single electrons and photons down to sub-cycle time scales are presented. The first part deals with ultrafast measurements on single-electron systems: The transient quantum dynamics in a single CdSe/ZnSe quantum dot is investigated via femtosecond transmission spectroscopy. A two-color Er:fiber laser with excellent noise performance is key to these first resonant pump-probe measurements on a single-electron system. We have observed ultrafast bleaching of an electronic transition in a single quantum dot due to instantaneous Coulomb renormalization. Since we were also able to invert the two-level system, optical gain due to a single electron has been detected. By using π-pulses for probing, we could deterministically add or remove a single photon to or from a femtosecond light pulse, leading to non-classical states of the light field. In order to optimize electron-photon coupling, nanophotonic concepts like dielectric microresonators and metal optical antennas are explored. In the second part of the paper, we present multi-terahertz measurements on low-energy excitations in semiconductors. These studies lead towards a future time-domain quantum optics on a time scale of single cycles of light: Intense multiterahertz fields of order MV/cm are used to coherently promote optically dark and dense para excitons in Cu₂O from the 1s into the 2p state. The nonlinear field response of the intra-excitonic degrees of freedom is directly monitored in the time domain via ultrabroadband electro-optic sampling. The experimental results are analyzed with a microscopic many-body theory, identifying up to two internal Rabi cycles. Subsequently, intersubband cavity polaritons in a quantum well waveguide structure are optically generated within less than one cycle of light by a femtosecond near-infrared pulse. Mid-infrared probe transients trace the non-adiabatic switch-on of ultrastrong light-matter coupling and the conversion of bare photons into cavity polaritons directly in the time domain.

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Proceedings Article | 16 June 2004 Paper

Coherent vs. incoherent charge transport in semiconductor quantum cascade structures

Michael Woerner, Felix Eickemeyer, Klaus Reimann, Thomas Elsaesser, Stefano Barbieri, Carlo Sirtori, T. Mueller, Rudolf Bratschitsch, Karl Unterrainer, G. Strasser

Proceedings Volume 5352, (2004) https://doi.org/10.1117/12.527512

KEYWORDS: Quantum cascade lasers, Electron transport, Scattering, Electroluminescence, Ultrafast phenomena, Fourier transforms, Femtosecond phenomena, Wave propagation, Solids, Superposition

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