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|Dr. Xavier Porte is working on external quantum
control of photonic nanostructures. He is interested in chaotic
dynamics, chaos synchronization, and complex networks with time
delayed couplings in mesoscopic systems. His research is located at
the crossroads between nonlinear dynamics, nanophotonics and quantum
information technology (QIT). Particularly focusing at the edge of the
non-classical regime where quantum fluctuations govern the nonlinear
dynamics of externally-coupled microlasers. First experimental studies
on this field included polarization-mode chaos in microscopic
semiconductor lasers induced by cavity QED enhanced fluctuations and
injection locking of cavity QED enhanced lasers operating in the
Xavier Porte studied physics at Universitat de les Illes Balears (Spain) and did his Master and PhD degrees at Instituto de Física Interdisciplinar y Sistemas Complejos (Spain) under the supervision of Prof. Dr. Ingo Fischer. During his PhD studies, he did a research stay at the Technische Universität Darmstadt (Germany), under the supervision of Prof. Dr. Wolfgang Elsässer. Xavier is a member of the Optical Society of America (OSA) and of the German Physical Society (DPG).
|Steffen Holzinger is working on the demonstration of
non-linear dynamics and chaos in feedback-coupled quantum-dot (QD)
microlasers in the quantum limit. Hereby, the impact of non-linear
dynamics and cavity quantum electrodynamics effects is explored beyond
the description of the Lang-Kobayashi model for classical
semiconductor lasers. This includes the systematic study of
micropillar lasers subject to self-feedback with different β-factors
(controlled by the quality-factor) and different number of QDs
contributing to the lasing mode under variation of feedback strength
and the length of the external cavity. Due to their slightly
elliptical cross-section QD-micropillars exhibit two linear,
orthogonally polarized lasing modes which compete using a common gain
medium. By applying polarized external feedback a strong change in the
intensity and the dynamics of the modes is investigated.
Steffen Holzinger did his B.Sc. and M.Sc. in nanotechnology at Julius-Maximilians-Universität Würzburg. His master study was focused on semiconductor physics and finalized by a master thesis on “Spectroscopy of polaritons in photonic wires” in the group of Prof. Martin Kamp in 2014.
Steffen Holzinger is a member of the German Physical Society (DPG) and the School of Nanophotonics (Research Training group of the CRC 787).
|Injection locking of standard semiconductor lasers,
where the slave adapts to the master laser’s frequency is well known
and widely applied e.g. for laser stabilization. We go beyond the
classical injection locking by exploring the quantum limit of
injection locking by using a microscopic quantum dot micropillar laser
as a slave. This device with a high quality factor and a low mode
volume exhibits high spontaneous emission enhancement due to the
Purcell effect, enabling stable lasing at intra-cavity photon numbers
as low as a few tens.
In these microlasers we will inject classical lasers with low intensity as well as other microlasers or single photon sources. With high resolution spectra and time-resolved measurements we will investigate the slave laser´s dynamics.
Elisabeth Schlottmann studied physics at the Technische Universität Berlin specialized in experimental and theoretical solid state physics and optics. Within the scope of her Clara von Simson Prize-winning master thesis she studied single semiconductor quantum dots, particularly the fine structure splitting and the generation of entangled photon pairs in the group of Prof. Reitzenstein. Elisabeth Schlottmann is a member of the German Physical Society (DPG) and the School of Nanophotonics (Research Training group of the CRC 787).
|Arsenty Kaganskiy is working on the development of a
complementary fabrication technology platform for deterministic
micropillar lasers with site-controlled QDs in the active layer. The
advantage of the used technique should be a possibility of control the
number of QDs in the active layer. Spectral resonance will be achieved
by determine the wavelength of target QDs in the single QD regime or
the center wavelength of small ensembles of site-controlled QDs before
patterning micropillar lasers with adjusted diameter. In the case of
small ensembles, the non-resonant coupling mechanism will ensure
effective gain-contributions also from detuned QDs within the
inhomogeneously broadened ensemble of site-controlled QDs. Thus it
will be possible to realize QD-microcavities for the study of lasing
with a pre-determined number of QDs in order to reach the single-QD
regime of feedback-coupled lasing in a controlled way.
Arsenty Kaganskiy did his M. Sc. at Technical University Berlin after he had got his B. Sc. at South Federal University in Rostov on Don (Russia). The master thesis “Development of deterministic quantum dot nanostructures for generation of entangled photon pairs” was done in the workgroup of Professor Stephan Reitzenstein in 2014. In 2015 Arsenty Kaganskiy was awarded with the Study Award in Physics for his Master thesis from the Physics Society of Berlin. Arsenty Kaganskiy is a member of the German Physical Society (DPG) and the School of Nanophotonics (Research Training group of the CRC 787).
|Sören Kreinberg is working on mutual coupling and
synchronization of the aforementioned microlasers to study their
correlated dynamics down to the regime of ultra-low light levels where
individual photons are exchanged between the microlasers. His work
adresses the question of the cause of isochronal synchronization of
two chaotic devices separated by distances larger than their coherence
Sören Kreinberg studied physics at TU Dortmund University. During the research for his master's thesis in the group of Prof. Bayer he investigated transient optical phenomena in semiconductors, using ultrafast laser spectroscopy. Sören Kreinberg is a member of the German Physical Society (DPG) and the School of Nanophotonics (Research Training group of the CRC 787).
Bachelor and Master students
|In optical spectroscopy the emission properties of the
systems under investigation depend on their excitation. Besides the
usually considered spectral width and partial coherence of the
excitation light field, its quantum statistics must also be taken into
account. We study the sensitivity of quantum emitters such as
microlasers or quantum dots to the statistics of the excitation field
and investigate applications to external quantum control of photonics
Marlon Placke studied physics at the University Bremen and at the Technical University Berlin with a focus on solid state and applied physics.
He is currently writing his master thesis on excitation statistics dependent spectroscopy in the group of Stephan Reitzenstein.
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