@inproceedings{3798,
  author       = {{Hett, Thomas and Frers, Torsten and Widhalm, Alex and Berth, Gerhard and Hilleringmann, Ulrich and Zrenner, Artur}},
  booktitle    = {{Smart Systems Integration 2016 - International Conference and Exhibition on Integration Issues of Miniaturized Systems, SSI 2016}},
  location     = {{Munich}},
  pages        = {{400 -- 403}},
  title        = {{{Silicon oxynitride microdisk resonators for integrated waveguide coupling}}},
  year         = {{2016}},
}

@article{3841,
  abstract     = {{We present phase sensitive cavity field measurements on photonic crystal microcavities. The experiments have been performed as autocorrelation measurements with ps double pulse laser excitation for resonant and detuned conditions. Measured E-field autocorrelation functions reveal a very strong detuning dependence of the phase shift between laser and cavity field and of the autocorrelation amplitude of the cavity field. The fully resolved phase information allows for a precise frequency discrimination and hence for a precise measurement of the detuning between laser and cavity. The behavior of the autocorrelation amplitude and phase and their detuning dependence can be fully described by an analytic model. Furthermore, coherent control of the cavity field is demonstrated by tailored laser excitation with phase and amplitude controlled pulses. The experimental proof and verification of the above described phenomena became possible by an electric detection scheme, which employs planar photonic crystal microcavity photo diodes with metallic Schottky contacts in the defect region of the resonator. The applied photo current detection was shown to work also efficiently at room temperature, which make electrically contacted microcavities attractive for real world applications.}},
  author       = {{Quiring, Wadim and Jonas, Björn and Förstner, Jens and Rai, Ashish K. and Reuter, Dirk and Wieck, Andreas D. and Zrenner, Artur}},
  issn         = {{1094-4087}},
  journal      = {{Optics Express}},
  keywords     = {{tet_topic_phc}},
  number       = {{18}},
  pages        = {{20672--20684}},
  publisher    = {{The Optical Society}},
  title        = {{{Phase sensitive properties and coherent manipulation of a photonic crystal microcavity}}},
  doi          = {{10.1364/oe.24.020672}},
  volume       = {{24}},
  year         = {{2016}},
}

@article{19210,
  author       = {{Breddermann, D. and Heinze, Dirk Florian and Binder, R. and Zrenner, Artur and Schumacher, Stefan}},
  issn         = {{2469-9950}},
  journal      = {{Physical Review B}},
  title        = {{{All-optical tailoring of single-photon spectra in a quantum-dot microcavity system}}},
  doi          = {{10.1103/physrevb.94.165310}},
  year         = {{2016}},
}

@article{4244,
  abstract     = {{In this work we study the resonant and coherent properties of single InP-based InAs quantum dots, which show an optical emission in the telecom C-band and L-band. High-resolution resonant photocurrent spectroscopy on p–i–n devices reveals narrow linewidths and fully resolved fine structure splittings. We observe Lorentzian line shapes, which allow for the extraction of dephasing times as a function of the applied bias voltage. Coherent ps laser excitation results in pronounced Rabi rotations with increasing pulse area. For π-pulse excitation, we obtain more than 93 % of the theoretically expected photocurrent amplitude. Our results also demonstrate that such state-of-the-art InP-based quantum dots for the telecom band exhibit promising key parameters comparable to well-established InAs/GaAs counterparts.}},
  author       = {{Gordon, S. and Yacob, M. and Reithmaier, J. P. and Benyoucef, M. and Zrenner, Artur}},
  issn         = {{0946-2171}},
  journal      = {{Applied Physics B}},
  keywords     = {{Bias Voltage, Optical Parametric Oscillator, Molecular Beam Epitaxy Growth, Internal Electric Field, Dephasing Time}},
  number       = {{2}},
  publisher    = {{Springer Nature}},
  title        = {{{Coherent photocurrent spectroscopy of single InP-based quantum dots in the telecom band at 1.5 µm}}},
  doi          = {{10.1007/s00340-015-6279-6}},
  volume       = {{122}},
  year         = {{2016}},
}

@article{4239,
  abstract     = {{Confocal Raman spectroscopy is applied to identify ferroelectric domain structure sensitive
phonon modes in potassium titanyl phosphate. Therefore, polarization-dependent measurements in
various scattering configurations have been performed to characterize the fundamental Raman
spectra of the material. The obtained spectra are discussed qualitatively based on an internal mode
assignment. In the main part of this work, we have characterized z-cut periodically poled potassium
titanyl phosphate in terms of polarity- and structure-sensitive phonon modes. Here, we find vibrations
whose intensities are linked to the ferroelectric domain walls. We interpret this in terms of
changes in the polarizability originating from strain induced by domain boundaries and the inner
field distribution. Hence, a direct and 3D visualization of ferroelectric domain structures becomes
possible in potassium titanyl phosphate.}},
  author       = {{Rüsing, Michael and Eigner, Christof and Mackwitz, P. and Berth, Gerhard and Silberhorn, Christine and Zrenner, Artur}},
  issn         = {{0021-8979}},
  journal      = {{Journal of Applied Physics}},
  number       = {{4}},
  publisher    = {{AIP Publishing}},
  title        = {{{Identification of ferroelectric domain structure sensitive phonon modes in potassium titanyl phosphate: A fundamental study}}},
  doi          = {{10.1063/1.4940964}},
  volume       = {{119}},
  year         = {{2016}},
}

@article{3888,
  abstract     = {{We successfully developed a process to fabricate freestanding cubic aluminium nitride (c-AlN) membranes containing cubic gallium nitride (c-GaN) quantum dots (QDs). The samples were grown by plasma assisted molecular beam epitaxy (MBE). To realize the photonic crystal (PhC) membrane we have chosen a triangular array of holes. The array was fabricated by electron beam lithography and several steps of reactive ion etching (RIE) with the help of a hard mask and an undercut of the active layer. The r/a- ratio of 0.35 was deter- mined by numerical simulations to obtain a preferably wide photonic band gap. Micro-photoluminescence (μ-PL) measurements of the photonic crystals, in particular of a H1 and a L3 cavity, and the emission of the QD ensemble were performed to characterize the samples. The PhCs show high quality factors of 4400 for the H1 cavity and about 5000/3000 for two different modes of the L3 cavity, respectively. The energy of the fundamental modes is in good agreement to the numerical simulations. }},
  author       = {{Blumenthal, Sarah and Bürger, Matthias and Hildebrandt, Andre and Förstner, Jens and Weber, Nils and Meier, Cedrik and Reuter, Dirk and As, Donat J.}},
  issn         = {{1862-6351}},
  journal      = {{physica status solidi (c)}},
  keywords     = {{tet_topic_phc, tet_topic_qd}},
  number       = {{5-6}},
  pages        = {{292--296}},
  publisher    = {{Wiley}},
  title        = {{{Fabrication and characterization of two-dimensional cubic AlN photonic crystal membranes containing zincblende GaN quantum dots}}},
  doi          = {{10.1002/pssc.201600010}},
  volume       = {{13}},
  year         = {{2016}},
}

@article{4237,
  abstract     = {{We report the fabrication of periodically poled domain patterns in x-cut lithium niobate thin-film.
Here, thin films on insulator have drawn particular attention due to their intrinsic waveguiding
properties offering high mode confinement and smaller devices compared to in-diffused waveguides
in bulk material. In contrast to z-cut thin film lithium niobate, the x-cut geometry does not
require back electrodes for poling. Further, the x-cut geometry grants direct access to the largest
nonlinear and electro-optical tensor element, which overall promises smaller devices. The domain
inversion was realized via electric field poling utilizing deposited aluminum top electrodes on a
stack of LN thin film/SiO2 layer/Bulk LN, which were patterned by optical lithography. The periodic
domain inversion was verified by non-invasive confocal second harmonic microscopy. Our
results show domain patterns in accordance to the electrode mask layout. The second harmonic signatures
can be interpreted in terms of spatially, overlapping domain filaments which start their
growth on the þz side.}},
  author       = {{Mackwitz, P. and Rüsing, Michael and Berth, Gerhard and Widhalm, A. and Müller, K. and Zrenner, Artur}},
  issn         = {{0003-6951}},
  journal      = {{Applied Physics Letters}},
  number       = {{15}},
  publisher    = {{AIP Publishing}},
  title        = {{{Periodic domain inversion in x-cut single-crystal lithium niobate thin film}}},
  doi          = {{10.1063/1.4946010}},
  volume       = {{108}},
  year         = {{2016}},
}

@article{4240,
  abstract     = {{Cubic gallium nitride (GaN) films are analyzed with highresolution X-ray diffraction (HRXRD) and Raman spectroscopy. Several cubic GaN layers were grown on 3C-SiC (001) substrate by radio-frequency plasma-assisted molecular beam epitaxy. The layer thickness of the cubic GaN was varied between 75 and 505 nm. The HRXRD analysis reveals a reduction of the full-width at half-maximum (FWHM) of omega scans for growing layer thicknesses, which is caused by a partial compensation of defects. The Raman characterization confirms well-formed c-GaN layers. A more detailed examination of the longitudinal optical mode hints at a correlation of the FWHM of the Raman mode with the dislocation density, which shows the possibility to determine dislocation densities by Ramanspectroscopy on a micrometer scale, which is not possible by HRXRD. Furthermore, this Raman analysis shows that normalized Raman spectra present an alternative way to determine layer thicknesses of thin GaN films.}},
  author       = {{Rüsing, Michael and Wecker, T. and Berth, Gerhard and As, Donat Josef and Zrenner, Artur}},
  issn         = {{0370-1972}},
  journal      = {{physica status solidi (b)}},
  keywords     = {{cubic gallium nitride, dislocation density, HRXRD, Raman spectroscopy}},
  number       = {{4}},
  pages        = {{778--782}},
  publisher    = {{Wiley}},
  title        = {{{Joint Raman spectroscopy and HRXRD investigation of cubic gallium nitride layers grown on 3C-SiC}}},
  doi          = {{10.1002/pssb.201552592}},
  volume       = {{253}},
  year         = {{2016}},
}

@article{10026,
  abstract     = {{Congruent lithium niobate and lithium tantalate mixed crystals have been grown over the complete
compositional range with the Czochralski method. The structural and vibrational properties of the mixed
crystals are studied extensively by x-ray diffraction measurements, Raman spectroscopy, and density functional
theory. The measured lattice parameters and vibrational frequencies are in good agreement with our theoretical
predictions. The observed dependence of the Raman frequencies on the crystal composition is discussed on the
basis of the calculated phonon displacement patterns. The phononic contribution to the static dielectric tensor
is calculated by means of the generalized Lyddane-Sachs-Teller relation. Due to the pronounced dependence of
the optical response on the Ta concentration, lithium niobate tantalate mixed crystals represent a perfect model
system to study the properties of uniaxial mixed ferroelectric materials for application in integrated optics.}},
  author       = {{Rüsing, Michael and Sanna, Simone and Neufeld, Sergej and Berth, Gerhard and Schmidt, Wolf Gero and Zrenner, Artur and Yu, H. and Wang, Y. and Zhang, H.}},
  issn         = {{2469-9950}},
  journal      = {{Physical Review B}},
  title        = {{{Vibrational properties of LiNb1−xTaxO3 mixed crystals}}},
  doi          = {{10.1103/physrevb.93.184305}},
  year         = {{2016}},
}

@article{4185,
  abstract     = {{Semiconductor quantum-dot cavity systems are promising sources for solid-state-based on-demand generation
of single photons for quantum communication. Commonly, the spectral characteristics of the emitted single
photon are fixed by system properties such as electronic transition energies and spectral properties of the cavity.
In the present work we study cavity-enhanced single-photon generation from the quantum-dot biexciton through
a partly stimulated nondegenerate two-photon emission. We show that frequency and linewidth of the single
photon can be fully controlled by the stimulating laser pulse, ultimately allowing for efficient all-optical spectral
shaping of the single photon.}},
  author       = {{Breddermann, D. and Heinze, D. and Binder, R. and Zrenner, Artur and Schumacher, Stefan}},
  issn         = {{2469-9950}},
  journal      = {{Physical Review B}},
  number       = {{16}},
  publisher    = {{American Physical Society (APS)}},
  title        = {{{All-optical tailoring of single-photon spectra in a quantum-dot microcavity system}}},
  doi          = {{10.1103/physrevb.94.165310}},
  volume       = {{94}},
  year         = {{2016}},
}

@article{4246,
  abstract     = {{Spins in semiconductor quantum dots have been considered as prospective quantum bit excitations. Their coupling to the crystal environment manifests itself in a limitation of the spin coherence times to the microsecond range, both for electron and hole spins. This rather short-lived coherence compared to atomic states asks for manipulations on timescales as short as possible. Due to the huge dipole moment for transitions between the valence and conduction band, pulsed laser systems offer the possibility to perform manipulations within picoseconds or even faster. Here, we report on results that show the potential of optical spin manipulations with currently available pulsed laser systems. Using picosecond laser pulses, we demonstrate optically induced spin rotations of electron and hole spins. We further realize the optical decoupling of the hole spins from the nuclear surrounding at the nanosecond timescales and demonstrate an all-optical spin tomography for interacting electron spin sub-ensembles.}},
  author       = {{Varwig, S. and Evers, E. and Greilich, A. and Yakovlev, D. R. and Reuter, Dirk and Wieck, A. D. and Meier, Torsten and Zrenner, Artur and Bayer, M.}},
  issn         = {{0946-2171}},
  journal      = {{Applied Physics B}},
  keywords     = {{Spin Polarization, Pump Pulse, Trion, Spin Component, Coherence Time}},
  number       = {{1}},
  publisher    = {{Springer Nature}},
  title        = {{{Advanced optical manipulation of carrier spins in (In,Ga)As quantum dots}}},
  doi          = {{10.1007/s00340-015-6274-y}},
  volume       = {{122}},
  year         = {{2016}},
}

@article{3900,
  abstract     = {{The coherent state preparation and control of single quantum systems is an important prerequisite for the implementation of functional quantum devices. Prominent examples for such systems are semiconductor quantum dots, which exhibit a fine structure split single exciton state and a V-type three level structure, given by a common ground state and two distinguishable and separately excitable transitions. In this work we introduce a novel concept for the preparation of a robust inversion by the sequential excitation in a V-type system via distinguishable paths.}},
  author       = {{Mantei, D. and Förstner, Jens and Gordon, S. and Leier, Y. A. and Rai, A. K. and Reuter, Dirk and Wieck, A. D. and Zrenner, Artur}},
  issn         = {{2045-2322}},
  journal      = {{Scientific Reports}},
  keywords     = {{tet_topic_qd}},
  number       = {{1}},
  pages        = {{10313}},
  publisher    = {{Springer Nature}},
  title        = {{{Robust Population Inversion by Polarization Selective Pulsed Excitation}}},
  doi          = {{10.1038/srep10313}},
  volume       = {{5}},
  year         = {{2015}},
}

@article{19209,
  author       = {{Heinze, Dirk Florian and Breddermann, Dominik and Zrenner, Artur and Schumacher, Stefan}},
  issn         = {{2041-1723}},
  journal      = {{Nature Communications}},
  title        = {{{A quantum dot single-photon source with on-the-fly all-optical polarization control and timed emission}}},
  doi          = {{10.1038/ncomms9473}},
  year         = {{2015}},
}

@article{22809,
  author       = {{Rai, Ashish K. and Gordon, Simon and Ludwig, Arne and Wieck, Andreas D. and Zrenner, Artur and Reuter, Dirk}},
  issn         = {{0370-1972}},
  journal      = {{physica status solidi (b)}},
  pages        = {{437--441}},
  title        = {{{Spatially indirect transitions in electric field tunable quantum dot diodes}}},
  doi          = {{10.1002/pssb.201552591}},
  year         = {{2015}},
}

@article{4276,
  abstract     = {{We analyse an InAs/GaAs-based electric field tunable single quantum dot diode with a thin tunnelling barrier between a
buried n þ -back contact and a quantum dot layer. In voltage- dependent photoluminescence measurements, we observe rich signatures from spatially direct and indirect transitions from the wetting layer and from a single quantum dot. By analysing the Stark effect, we show that the indirect transitions result from a recombination between confined holes in the wetting or quantum dot layer with electrons from the edge of the Fermi sea in the back contact. Using a 17 nm tunnel barrier which provides comparably weak tunnel coupling allowed us to observe clear signatures of direct and corresponding indirect lines for a series of neutral and positively charged quantum dot states.}},
  author       = {{Rai, Ashish K. and Gordon, Simon and Ludwig, Arne and Wieck, Andreas D. and Zrenner, Artur and Reuter, Dirk}},
  issn         = {{0370-1972}},
  journal      = {{physica status solidi (b)}},
  keywords     = {{excitons, GaAs, InAs, quantum dots, spatially indirect transitions, Stark shift}},
  number       = {{3}},
  pages        = {{437--441}},
  publisher    = {{Wiley}},
  title        = {{{Spatially indirect transitions in electric field tunable quantum dot diodes}}},
  doi          = {{10.1002/pssb.201552591}},
  volume       = {{253}},
  year         = {{2015}},
}

@article{4331,
  abstract     = {{We report about the fabrication and analysis of high Q photonic crystal cavities with metallic
Schottky-contacts. The structures are based on GaAs n-i membranes with an InGaAs quantum well
in the i-region and nanostructured low ohmic metal top-gates. They are designed for photocurrent
readout within the cavity and fast electric manipulations. The cavity structures are characterized by
photoluminescence and photocurrent spectroscopy under resonant excitation. We find strong cavity
resonances in the photocurrent spectra and surprisingly high Q-factors up to 6500. Temperature dependent
photocurrent measurements in the region between 4.5K and 310K show an exponential
enhancement of the photocurrent signal and an external quantum efficiency up to 0.26.}},
  author       = {{Quiring, W. and Al-Hmoud, M. and Rai, A. and Reuter, Dirk and Wieck, A. D. and Zrenner, Artur}},
  issn         = {{0003-6951}},
  journal      = {{Applied Physics Letters}},
  number       = {{4}},
  publisher    = {{AIP Publishing}},
  title        = {{{Photonic crystal cavities with metallic Schottky contacts}}},
  doi          = {{10.1063/1.4928038}},
  volume       = {{107}},
  year         = {{2015}},
}

@misc{4360,
  abstract     = {{Die Erfindung betrifft ein Verfahren zur Präparation einer Besetzungsinversion in einem Quantensystem (Q) mittels Mehrpulsanregung, wobei ein Quantensystem (Q) umfassend wenigstens einen Quantenpunkt mit zwei orthogonalen Zuständen (/X>, /Y>), insbesondere die mit zueinander orthogonalen Polarisationen (P1, P2) optisch anregbar sind, mit einem ersten Laserpuls (L1) beleuchtet wird, welcher zur resonanten Anregung des ersten (/Y>) der zwei Zustände (/X>, /Y>) eingestellt wird und zeitlich nachfolgend mit einem zweiten Laserpuls (L2) beleuchtet wird, der zur resonanten Anregung des zweiten (/X>) der zwei Zustände (/X>, /Y>) eingestellt wird.}},
  author       = {{Zrenner, Artur and Förstner, Jens and Mantei, Dirk}},
  keywords     = {{tet_topic_qd}},
  title        = {{{A process for the preparation of a population inversion in a quantum system using multi-pulse excitation}}},
  year         = {{2015}},
}

@article{4332,
  abstract     = {{LiTaO3 and LiNbO3 crystals are investigated here in a combined experimental and theoretical study that uses Raman spectroscopy in a complete set of scattering geometries and corresponding density-functional theory calculations to provide microscopic information on their vibrational properties. The Raman scattering efficiency is computed from first principles in order to univocally assign the measured Raman peaks to the calculated eigenvectors. Measured and calculated Raman spectra are shown to be in qualitative agreement and confirm the mode assignment by Margueron et al. [J. Appl. Phys. 111, 104105 (2012)], thus finally settling a long debate. While the two crystals show rather similar vibrational properties overall, the E-TO9 mode is markedly different in the two oxides. The deviations are explained by a different anion-cation bond type in LiTaO3 and LiNbO3 crystals.}},
  author       = {{Sanna, Simone and Neufeld, Sergej and Rüsing, Michael and Berth, Gerhard and Zrenner, Artur and Schmidt, Wolf Gero}},
  issn         = {{1098-0121}},
  journal      = {{Physical Review B}},
  number       = {{22}},
  publisher    = {{American Physical Society (APS)}},
  title        = {{{Raman scattering efficiency in LiTaO3 and LiNbO3 crystals}}},
  doi          = {{10.1103/physrevb.91.224302}},
  volume       = {{91}},
  year         = {{2015}},
}

@article{4330,
  abstract     = {{Sources of single photons are key elements for applications in quantum information science.
Among the different sources available, semiconductor quantum dots excel with their
integrability in semiconductor on-chip solutions and the potential that photon emission can
be triggered on demand. Usually, the photon is emitted from a single-exciton ground state.
Polarization of the photon and time of emission are either probabilistic or pre-determined by
electronic properties of the system. Here, we study the direct two-photon emission from the
biexciton. The two-photon emission is enabled by a laser pulse driving the system into a
virtual state inside the band gap. From this intermediate state, the single photon of interest
is then spontaneously emitted. We show that emission through this higher-order
transition provides a versatile approach to generate a single photon. Through the driving
laser pulse, polarization state, frequency and emission time of the photon can be controlled
on-the-fly.}},
  author       = {{Heinze, Dirk and Breddermann, Dominik and Zrenner, Artur and Schumacher, Stefan}},
  issn         = {{2041-1723}},
  journal      = {{Nature Communications}},
  number       = {{1}},
  publisher    = {{Springer Nature}},
  title        = {{{A quantum dot single-photon source with on-the-fly all-optical polarization control and timed emission}}},
  doi          = {{10.1038/ncomms9473}},
  volume       = {{6}},
  year         = {{2015}},
}

@article{4335,
  abstract     = {{We explore the impact of ∼500 MHz surface acoustic waves traveling across a commensurable plasmonic grating coupler. A stroboscopic technique involving surface acoustic waves synchronized to a modelocked optical source allows to time-resolve the dynamical impact of the electromechanically induced perturbation. The surface acoustic wave periodically enhances or decreases the surface ripple of the static grating. Most remarkably, the dynamic surface deformation deliberately modulates the coupler’s efficiency by ±2% during the ∼2 ns acoustic cycle.}},
  author       = {{Ruppert, Claudia and Förster, Frederike and Zrenner, Artur and Kinzel, Jörg B. and Wixforth, Achim and Krenner, Hubert J. and Betz, Markus}},
  issn         = {{2330-4022}},
  journal      = {{ACS Photonics}},
  keywords     = {{nanomechanics, plasmonics, surface acoustic waves, surface plasmon polaritons}},
  number       = {{2}},
  pages        = {{91--95}},
  publisher    = {{American Chemical Society (ACS)}},
  title        = {{{Radio Frequency Electromechanical Control over a Surface Plasmon Polariton Coupler}}},
  doi          = {{10.1021/ph400022u}},
  volume       = {{1}},
  year         = {{2014}},
}