Prof. Dr. Torsten Meier - Contact (Paderborn University)

Approximate nonlinear wave solutions of the coupled two-component Gross–Pitaevskii equations with spin–orbit interaction

D.B. Belobo, T. Meier, New Journal of Physics (2021), 043045

DOI

Dark-state and loss-induced phenomena in the quantum-optical regime of Λ-type three-level systems

H. Rose, D.V. Popolitova, O.V. Tikhonova, T. Meier, P. Sharapova, Physical Review A (2021)

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Microscopic analysis of high harmonic generation in semiconductors with degenerate bands

L.H. Thong, C. Ngo, H.T. Duc, X. Song, T. Meier, Physical Review B (2021), 103

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Low-field Onset of Wannier-Stark Localization in a Polycrystalline Hybrid Organic Inorganic Perovskite

D. Berghoff, J. Bühler, M. Bonn, A. Leitenstorfer, T. Meier, H. Kim, 2021

Abstract

<jats:title>Abstract</jats:title> <jats:p>Control over light propagation in a material by applying external fields is at the heart of photonic applications. Here, we demonstrate ultrafast modulation of the optical properties in the room temperature polycrystalline MAPbI<jats:sub>3</jats:sub> perovskite using phase-stable terahertz pulses, centered at 20 THz. The biasing field from the THz pulse creates extreme localization of electronic states in the <jats:italic>ab</jats:italic> plane – Wannier-Stark localization. This quasi-instantaneous reduction of dimensionality (from 3D to 2D) causes a marked change in the absorption shape, enabling the modulation depth to be tens of percent at moderate field strengths (3 MV/cm). The notably low-field onset results from a narrow electronic bandwidth, a large relevant lattice constant, and the coincidence of the two along the same direction in this tetragonal perovskite. We show that the transient optical response is in fact dominated by the least dispersive direction of the electronic band structure, facilitating a substantial modulation despite the arbitrary arrangement of the individual crystallites. The demonstration of THz-field-induced optical modulation in a solution-processed, disordered, and polycrystalline material is of substantial potential significance for novel photonic applications.</jats:p>

Controlling the emission time of photon echoes by optical freezing of exciton dephasing and rephasing in quantum-dot ensembles

M. Reichelt, H. Rose, A.N. Kosarev, S.V. Poltavtsev, M. Bayer, I.A. Akimov, C. Schneider, M. Kamp, S. Höfling, T. Meier, in: Ultrafast Phenomena and Nanophotonics XXV, 2021

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M. Riabinin, P. Sharapova, T. Meier, Optics Express (2021), 21876

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Generating two-mode squeezing with multimode measurement-induced nonlinearity

M. Riabinin, P. Sharapova, T. Bartley, T. Meier, Journal of Physics Communications (2021)

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Nondegenerate two-photon absorption in ZnSe: Experiment and theory

L. Krauss-Kodytek, W. Hannes, T. Meier, C. Ruppert, M. Betz, Physical Review B (2021)

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Theoretical analysis and simulations of two-dimensional Fourier transform spectroscopy performed on exciton-polaritons of a quantum-well microcavity system

H. Rose, J. Paul, J.K. Wahlstrand, A.D. Bristow, T. Meier, in: Ultrafast Phenomena and Nanophotonics XXV, 2021

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Strongly nonresonant four-wave mixing in semiconductors

W. Hannes, A. Trautmann, M. Stein, F. Sch\, M. Koch, T. Meier, Phys. Rev. B (2020), 101, pp. 075203

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Enhanced high-order harmonic generation in semiconductors by excitation with multicolor pulses

X. Song, S. Yang, R. Zuo, T. Meier, W. Yang, Physical Review A (2020), 101

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Accurate photon echo timing by optical freezing of exciton dephasing and rephasing in quantum dots

A.N. Kosarev, H. Rose, S.V. Poltavtsev, M. Reichelt, C. Schneider, M. Kamp, S. Höfling, M. Bayer, T. Meier, I.A. Akimov, Communications Physics (2020), 3

Abstract

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<jats:title>Abstract</jats:title><jats:p>Semiconductor quantum dots are excellent candidates for ultrafast coherent manipulation of qubits by laser pulses on picosecond timescales or even faster. In inhomogeneous ensembles a macroscopic optical polarization decays rapidly due to dephasing, which, however, is reversible in photon echoes carrying complete information about the coherent ensemble dynamics. Control of the echo emission time is mandatory for applications. Here, we propose a concept to reach this goal. In a two-pulse photon echo sequence, we apply an additional resonant control pulse with multiple of 2<jats:italic>π</jats:italic> area. Depending on its arrival time, the control slows down dephasing or rephasing of the exciton ensemble during its action. We demonstrate for self-assembled (In,Ga)As quantum dots that the photon echo emission time can be retarded or advanced by up to 5 ps relative to its nominal appearance time without control. This versatile protocol may be used to obtain significantly longer temporal shifts for suitably tailored control pulses.</jats:p>

k.p-based multiband simulations of non-degenerate two-photon absorption in bulk GaAs

W. Hannes, T. Meier, in: Ultrafast Phenomena and Nanophotonics XXIV, 2020

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Carrier-wave population transfer in semiconductors

R. Zuo, X. Song, T. Meier, W. Yang, Journal of Physics: Conference Series (2020), 082005

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Realization of all-optical vortex switching in exciton-polariton condensates.

X. Ma, B. Berger, M. Aßmann, R. Driben, T. Meier, C. Schneider, S. Höfling, S. Schumacher, Nature Communications (2020), 11(1), pp. 897

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PubMed

Generating two-mode squeezing with multimode measurement-induced nonlinearity

M. Riabinin, P. Sharapova, T. Bartley, T. Meier, in: arXiv:1912.09097, 2019

Abstract

Measurement-induced nonclassical effects in a two-mode interferometer are investigated theoretically using numerical simulations and analytical results. We demonstrate that for certain parameters measurements within the interferometer lead to the occurrence of two-mode squeezing. The results strongly depend on the detection probability, the phase inside the interferometer, and the choice of the input states. The appropriate parameters for maximized squeezing are obtained. We analyze the influence of losses and confirm that the predicted effects are within reach of current experimental techniques.

Spatially asymmetric transients of propagating exciton-polariton modes in a planar CdZnTe/CdMgTe guiding structure

J. Vondran, F. Spitzer, M. Bayer, I.A. Akimov, A. Trautmann, M. Reichelt, C. Meier, N. Weber, T. Meier, R. André, H. Mariette, Physical Review B (2019)

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Nonlinear integrated quantum electro-optic circuits

K. Luo, S. Brauner, C. Eigner, P.R. Sharapova, R. Ricken, T. Meier, H. Herrmann, C. Silberhorn, Science Advances (2019), eaat1451

Abstract

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<jats:p>Future quantum computation and networks require scalable monolithic circuits, which incorporate various advanced functionalities on a single physical substrate. Although substantial progress for various applications has already been demonstrated on different platforms, the range of diversified manipulation of photonic states on demand on a single chip has remained limited, especially dynamic time management. Here, we demonstrate an electro-optic device, including photon pair generation, propagation, electro-optical path routing, as well as a voltage-controllable time delay of up to ~12 ps on a single Ti:LiNbO<jats:sub>3</jats:sub> waveguide chip. As an example, we demonstrate Hong-Ou-Mandel interference with a visibility of more than 93 ± 1.8%. Our chip not only enables the deliberate manipulation of photonic states by rotating the polarization but also provides precise time control. Our experiment reveals that we have full flexible control over single-qubit operations by harnessing the complete potential of fast on-chip electro-optic modulation.</jats:p>

Spatially asymmetric transients of propagating exciton-polariton modes in a planar CdZnTe/CdMgTe guiding structure

J. Vondran, F. Spitzer, M. Bayer, I.A. Akimov, A. Trautmann, M. Reichelt, C. Meier, N. Weber, T. Meier, R. André, H. Mariette, Physical Review B (2019)

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Intensity-dependent degenerate and non-degenerate nonlinear optical absorption of direct-gap semiconductors

W. Hannes, L. Krauß-Kodytek, C. Ruppert, M. Betz, T. Meier, in: Ultrafast Phenomena and Nanophotonics XXIII, 2019

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Higher-order contributions and nonperturbative effects in the nondegenerate nonlinear optical absorption of semiconductors using a two-band model

W. Hannes, T. Meier, Physical Review B (2019), 99(12)

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Attosecond temporal confinement of interband excitation by intraband motion

X. Song, R. Zuo, S. Yang, P. Li, T. Meier, W. Yang, Optics Express (2019), 27, 2225

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Ballistic photocurrents in semiconductor quantum wells caused by the excitation of asymmetric excitons

H.T. Duc, C. Ngo, T. Meier, Physical Review B (2019), 100(4)

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Bloch oscillations of multidimensional dark soliton wave packets and light bullets.

R. Driben, X. Ma, S. Schumacher, T. Meier, Optics Letters (2019), 44(6), pp. 1327-1330

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PubMed

Exotic complexes in one-dimensional Bose-Einstein condensates with spin-orbit coupling

D.B. Belobo, T. Meier, Scientific Reports (2018), 8(1)

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Coherent optical spectroscopy of charged exciton complexes in semiconductor nanostructures

I. Akimov, S.V. Poltavtsev, M. Salewski, I.A. Yugova, G.. Karczewski, T. Wojtowicz, W.. Maciej , M. Reichelt, T. Meier, D. Yakovlev, M. Bayer, in: Ultrafast Phenomena and Nanophotonics XXII, SPIE, 2018

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Nonlinearity-induced localization in a periodically driven semidiscrete system

R. Driben, V.V. Konotop, B.A. Malomed, T. Meier, A.V. Yulin, Physical Review E (2018), 97(6)

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Observation and Uses of Position-Space Bloch Oscillations in an Ultracold Gas

Z.A. Geiger, K.M. Fujiwara, K. Singh, R. Senaratne, S.V. Rajagopal, M. Lipatov, T. Shimasaki, R. Driben, V.V. Konotop, T. Meier, D.M. Weld, Physical Review Letters (2018), 120(21)

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Signatures of transient Wannier-Stark localization in bulk gallium arsenide

C. Schmidt, J. Bühler, A. Heinrich, J. Allerbeck, R. Podzimski, D. Berghoff, T. Meier, W.G. Schmidt, C. Reichl, W. Wegscheider, D. Brida, A. Leitenstorfer, Nature Communications (2018), 9(1)

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Coherent optical spectroscopy of charged exciton complexes in semiconductor nanostructures

I. Akimov, S.V. Poltavtsev, M. Salewski, I.A. Yugova, G. Karczewski, T. Wojtowicz, W. Maciej, M. Reichelt, T. Meier, D. Yakovlev, M. Bayer, in: Ultrafast Phenomena and Nanophotonics XXII, 2018, pp. 105300G

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Observation and Uses of Position-Space Bloch Oscillations in an Ultracold Gas

Z.A. Geiger, K.M. Fujiwara, K. Singh, R. Senaratne, S.V. Rajagopal, M. Lipatov, T. Shimasaki, R. Driben, V.V. Konotop, T. Meier, D.M. Weld, Physical Review Letters (2018), 120(21)

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Nonlinearity-induced localization in a periodically driven semidiscrete system

R. Driben, V.V. Konotop, B.A. Malomed, T. Meier, A.V. Yulin, Physical Review E (2018), 97(6)

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Signatures of transient Wannier-Stark localization in bulk gallium arsenide

C. Schmidt, J. Bühler, A. Heinrich, J. Allerbeck, R. Podzimski, D. Berghoff, T. Meier, W.G. Schmidt, C. Reichl, W. Wegscheider, D. Brida, A. Leitenstorfer, Nature Communications (2018), 9, pp. 2890

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Time-resolved photon echoes from donor-bound excitons in ZnO epitaxial layers

S.V. Poltavtsev, A.N. Kosarev, I.A. Akimov, D.R. Yakovlev, S. Sadofev, J. Puls, S.P. Hoffmann, M. Albert, C. Meier, T. Meier, M. Bayer, Physical Review B (2017), 96(3)

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Towards integrated superconducting detectors on lithium niobate waveguides

J.P. Höpker, M. Bartnick, E. Meyer-Scott, F. Thiele, T. Meier, T. Bartley, S. Krapick, N.M. Montaut, M. Santandrea, H. Herrmann, S. Lengeling, R. Ricken, V. Quiring, A.E. Lita, V.B. Verma, T. Gerrits, S.W. Nam, C. Silberhorn, in: Quantum Photonic Devices, 2017, pp. 1035809

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Modified two-photon interference achieved by the manipulation of entanglement

P. Sharapova, K. Luo, H. Herrmann, M. Reichelt, C. Silberhorn, T. Meier, Physical Review A (2017), 96, pp. 043857

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Toolbox for the design of LiNbO3-based passive and active integrated quantum circuits

P. Sharapova, K.H. Luo, H. Herrmann, M. Reichelt, T. Meier, C. Silberhorn, New Journal of Physics (2017), 19, 123009

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Damping of Rabi oscillations in intensity-dependent photon echoes from exciton complexes in a CdTe/(Cd,Mg)Te single quantum well

S.V. Poltavtsev, M. Reichelt, I.A. Akimov, G. Karczewski, M. Wiater, T. Wojtowicz, D.R. Yakovlev, T. Meier, M. Bayer, Physical Review B (2017), 96, pp. 075306

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High-Resolution Two-Dimensional Optical Spectroscopy of Electron Spins

M. Salewski, S. Poltavtsev, I. Yugova, G. Karczewski, M. Wiater, T. Wojtowicz, D. Yakovlev, I. Akimov, T. Meier, M. Bayer, Physical Review X (2017), 7, pp. 031030

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Bloch oscillations sustained by nonlinearity

R. Driben, V.V. Konotop, T. Meier, A.V. Yulin, Scientific Reports (2017)

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Bloch oscillations and resonant radiation of light propagating in arrays of nonlinear fibers with high-order dispersion

A. Yulin, R. Driben, T. Meier, Physical Review A (2017), 96(3)

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Anisotropic excitons and their contributions to shift current transients in bulk GaAs

R. Podzimski, H.T. Duc, T. Meier, Physical Review B (2017), 96(20)

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A microscopic approach to ultrafast near band gap photocurrents in bulk semiconductors

R. Podzimski, H.T. Duc, T. Meier, in: Ultrafast Phenomena and Nanophotonics XXI, 2017

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Ultrafast shift and rectification photocurrents in GaAs quantum wells: Excitation intensity dependence and the importance of band mixing

H.T. Duc, R. Podzimski, S. Priyadarshi, M. Bieler, T. Meier, Physical Review B (2016)

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Advanced optical manipulation of carrier spins in (In,Ga)As quantum dots

S. Varwig, E. Evers, A. Greilich, D.R. Yakovlev, D. Reuter, A.D. Wieck, T. Meier, A. Zrenner, M. Bayer, Applied Physics B (2016), 122(1)

Abstract

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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.

Dynamics of dipoles and vortices in nonlinearly coupled three-dimensional field oscillators

R. Driben, V.V. Konotop, B.A. Malomed, T. Meier, Physical Review E (2016), 94(1)

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Precession and nutation dynamics of nonlinearly coupled non-coaxial three-dimensional matter wave vortices

R. Driben, V.V. Konotop, T. Meier, Scientific Reports (2016), 6, pp. 22758

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Indium oxide inverse opal films synthesized by structure replication method

S. Amrehn, D. Berghoff, A. Nikitin, M. Reichelt, X. Wu, T. Meier, T. Wagner, Photonics and Nanostructures - Fundamentals and Applications (2016), 19, pp. 55-63

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Photocurrents in semiconductors and semiconductor quantum wells analyzed by k.p-based Bloch equations

R. Podzimski, H.T. Duc, S. Priyadarshi, C. Schmidt, M. Bieler, T. Meier, in: Ultrafast Phenomena and Nanophotonics XX, 2016

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Quantum interference control of electrical currents in GaAs microstructures: physics and spectroscopic applications

E. Sternemann, T. Jostmeier, C. Ruppert, S. Thunich, H.T. Duc, R. Podzimski, T. Meier, M. Betz, Applied Physics B (2016), 122(44)

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Ultrafast dynamical response of the lower exciton-polariton branch in CdZnTe

J. Lohrenz, S. Melzer, C. Ruppert, I.A. Akimov, H. Mariette, M. Reichelt, A. Trautmann, T. Meier, M. Betz, Physical Review B (2016), 93(7)

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Simulations of high harmonic generation from plasmonic nanoparticles in the terahertz region

Y. Grynko, T. Zentgraf, T. Meier, J. Förstner, Applied Physics B (2016), 122(9), pp. 242

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Two-dimensional symbiotic solitons and vortices in binary condensates with attractive cross-species interaction

X. Ma, R. Driben, B.A. Malomed, T. Meier, S. Schumacher, Scientific Reports (2016), 6, 34847

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Creation of vortices by torque in multidimensional media with inhomogeneous defocusing nonlinearity

R. Driben, T. Meier, B.A. Malomed, Scientific Reports (2015)

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Time-domain calculations of shift currents in bulk GaAs

R. Podzimski, H.T. Duc, T. Meier, in: Ultrafast Phenomena and Nanophotonics XIX, 2015

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Curvature effects in the band structure of carbon nanotubes including spin–orbit coupling

H. Liu, D.F. Heinze, H. Thanh Duc, S. Schumacher, T. Meier, Journal of Physics: Condensed Matter (2015), 445501

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Multipoles and vortex multiplets in multidimensional media with inhomogeneous defocusing nonlinearity

R. Driben, N. Dror, B.A. Malomed, T. Meier, New Journal of Physics (2015), 083043

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Sub-cycle control of multi-THz high-harmonic generation and all-coherent charge transport in bulk semiconductors

C. Lange, O. Schubert, M. Hohenleutner, F. Langer, S. Baierl, T. Maag, B. Urbanek, E.R.J. Edwards, G. Woltersdorf, D. Bougeard, U. Huttner, D. Golde, T. Meier, M. Kira, S.W. Koch, R. Huber, in: Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XIV, 2015

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Time-domain calculations of shift currents in bulk GaAs

R. Podzimski, H.T. Duc, T. Meier, in: Ultrafast Phenomena and Nanophotonics XIX, 2015

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Curvature effects in the band structure of carbon nanotubes including spin–orbit coupling

H. Liu, D.F. Heinze, H. Thanh Duc, S. Schumacher, T. Meier, Journal of Physics: Condensed Matter (2015), 27, 445501

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Multipoles and vortex multiplets in multidimensional media with inhomogeneous defocusing nonlinearity

R. Driben, N. Dror, B.A. Malomed, T. Meier, New Journal of Physics (2015), 17, 083043

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Sub-cycle control of multi-THz high-harmonic generation and all-coherent charge transport in bulk semiconductors

C. Lange, O. Schubert, M. Hohenleutner, F. Langer, S. Baierl, T. Maag, B. Urbanek, E.R.J. Edwards, G. Woltersdorf, D. Bougeard, U. Huttner, D. Golde, T. Meier, M. Kira, S.W. Koch, R. Huber, in: Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XIV, 2015

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Time-domain calculations of shift currents in bulk GaAs

R. Podzimski, H.T. Duc, T. Meier, in: Ultrafast Phenomena and Nanophotonics XIX, 2015

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Multipoles and vortex multiplets in multidimensional media with inhomogeneous defocusing nonlinearity

R. Driben, N. Dror, B.A. Malomed, T. Meier, New Journal of Physics (2015), 17, 083043

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Sub-cycle control of multi-THz high-harmonic generation and all-coherent charge transport in bulk semiconductors

C. Lange, O. Schubert, M. Hohenleutner, F. Langer, S. Baierl, T. Maag, B. Urbanek, E.R.J. Edwards, G. Woltersdorf, D. Bougeard, U. Huttner, D. Golde, T. Meier, M. Kira, S.W. Koch, R. Huber, in: Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XIV, 2015

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Time-domain calculations of shift currents in bulk GaAs

R. Podzimski, H.T. Duc, T. Meier, in: Ultrafast Phenomena and Nanophotonics XIX, 2015

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Creation of vortices by torque in multidimensional media with inhomogeneous defocusing nonlinearity

R. Driben, T. Meier, B.A. Malomed, Scientific Reports (2015), 5, pp. 9420

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Coupled Airy breathers

R. Driben, V.V. Konotop, T. Meier, Optics Letters (2014), 5523

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Nonlinear dynamics of Airy-vortex 3D wave packets: emission of vortex light waves

R. Driben, T. Meier, Optics Letters (2014), 5539

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Theory of filtered type-II parametric down-conversion in the continuous-variable domain: Quantifying the impacts of filtering

A. Christ, C. Lupo, M. Reichelt, T. Meier, C. Silberhorn, Physical Review A (2014)

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Three-dimensional hybrid vortex solitons

R. Driben, Y.V. Kartashov, B.A. Malomed, T. Meier, L. Torner, New Journal of Physics (2014), 063035

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Regeneration of Airy pulses in fiber-optic links with dispersion management of the two leading dispersion terms of opposite signs

R. Driben, T. Meier, Physical Review A (2014)

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Engineering plasmonic and dielectric directional nanoantennas

A. Hildebrandt, M. Reichelt, T. Meier, J. Förstner, in: Ultrafast Phenomena and Nanophotonics XVIII, SPIE, 2014, pp. 89841G-8941G-6

Abstract

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Optical and infrared antennas provide a promising way to couple photons in and out of nanoscale structures. As counterpart to conventional radio antennas, they are able to increase optical felds in sub-wavelength volumes, to enhance excitation and emission of quantum emitters or to direct light, radiated by quantum emitters. The directed emission of these antennas has been mainly pursued by surface plasmon based devices, e.g. Yagi-Uda like antennas, which are rather complicated due to the coupling of several metallic particles. Also, like all metallic structures in optical or infrared regime, these devices are very sensitive to fabrication tolerances and are affected by strong losses. It has been shown recently, that such directed emission can be accomplished by dielectric materials as well. In this paper we present an optimization of nanoscopic antennas in the near infrared regime starting from a metallic Yagi-Uda structure. The optimization is done via a particle-swarm algorithm, using full time domain finite integration simulations to obtain the characteristics of the investigated structure, also taking into account substrates. Furthermore we present a dielectric antenna, which performs even better, due to the lack of losses by an appropriate choice of the dielectric material. These antennas are robust concerning fabrication tolerances and can be realized with different materials for both the antenna and the substrate, without using high index materials.

Influence of Coulomb-induced band couplings on linear excitonic absorption spectra of semiconducting carbon nanotubes

H. Liu, S. Schumacher, T. Meier, Physical Review B (2014)

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Generation and Time-Resolved Detection of Coherently Controlled Electric Currents at Surfaces

J. Güdde, M. Rohleder, T. Meier, S. Koch, U. Höfer, in: Frontiers in Optics 2008/Laser Science XXIV/Plasmonics and Metamaterials/Optical Fabrication and Testing, 2013

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Femtosecond quantum interference control of electrical currents in GaAs: Signatures beyond the perturbativeχ(3)limit

E. Sternemann, T. Jostmeier, C. Ruppert, H.T. Duc, T. Meier, M. Betz, Physical Review B (2013)

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Optimal second-harmonic generation in split-ring resonator arrays

Y. Grynko, T. Meier, S. Linden, F.B.P. Niesler, M. Wegener, J. Förstner, in: Ultrafast Phenomena and Nanophotonics XVII, SPIE, 2013, pp. 86230L-86230L-9

Abstract

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Previous experimental measurements and numerical simulations give evidence of strong electric and magnetic field interaction between split-ring resonators in dense arrays. One can expect that such interactions have an influence on the second harmonic generation. We apply the Discontinuous Galerkin Time Domain method and the hydrodynamic Maxwell-Vlasov model to simulate the linear and nonlinear optical response from SRR arrays. The simulations show that dense placement of the constituent building blocks appears not always optimal and collective effects can lead to a significant suppression of the near fields at the fundamental frequency and, consequently, to the decrease of the SHG intensity. We demonstrate also the great role of the symmetry degree of the array layout which results in the variation of the SHG efficiency in range of two orders of magnitude.

Collective effects in second-harmonic generation from split-ring-resonator arrays

F.B. Niesler, S. Linden, J. Förstner, Y. Grynko, T. Meier, M. Wegener, in: Conference on Lasers and Electro-Optics 2012, OSA, 2013

Abstract

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We perform experiments on resonant second-harmonic generation from planar gold split-ring-resonator arrays under normal incidence of light as a function of the lattice constant. Optimum nonlinear conversion occurs at intermediate lattice constants.

Selection rules and linear absorption spectra of carbon nanotubes in axial magnetic fields

H. Liu, S. Schumacher, T. Meier, Physical Review B (2013)

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Collective Effects in Second-Harmonic Generation from Split-Ring-Resonator Arrays

S. Linden, F.B.P. Niesler, J. Förstner, Y. Grynko, T. Meier, M. Wegener, Physical Review Letters (2012)

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Tailoring the high-harmonic emission in two-level systems and semiconductors by pulse shaping

M. Reichelt, A. Walther, T. Meier, Journal of the Optical Society of America B (2012), A36

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Optimization of the intensity enhancement in plasmonic nanoantennas

A. Hildebrandt, M. Reichelt, T. Meier, J. Förstner, AIP AIP Conference Proceedings 1475, 2012

Abstract

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We design the geometrical shape of plasmonic nanostructures to achieve field patterns with desired properties. For this, we combine Maxwell simulations and automatic optimization techniques. By allowing variations of the geometrical shape, which can be based on either boxes or arbitrary polygons, we maximize the desired objective.

Near-field coupling and second-harmonic generation in split-ring resonator arrays

Y. Grynko, T. Meier, S. Linden, F.B.P. Niesler, M. Wegener, J. Förstner, AIP Conference Proceedings 1475, 2012, pp. 128-130

Abstract

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We simulate the linear and nonlinear optical response from split-ring resonator (SRR) arrays to study collective effects between the constituent SRRs that determine spectral properties of the second harmonic generation (SHG). We apply the Discontinuous Galerkin Time Domain (DGTD) method and the hydrodynamic Maxwell-Vlasov model to calculate the SHG emission. Our model is able to qualitatively reproduce and explain the non-monotonic dependence of the spectral SHG transmission measured experimentally for SRR arrays with different lattice constants

Collective Effects in Second-Harmonic Generation from Split-Ring-Resonator Arrays

S. Linden, F.B.P. Niesler, J. Förstner, Y. Grynko, T. Meier, M. Wegener, Physical Review Letters (2012), 109(1), pp. 015502

Abstract

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DOI

Optical experiments on second-harmonic generation from split-ring-resonator square arrays show a nonmonotonic dependence of the conversion efficiency on the lattice constant. This finding is interpreted in terms of a competition between dilution effects and linewidth or near-field changes due to interactions among the individual elements in the array.

2012 Niesler,Linden,Förstner,Grynko,Meier,Wegener_Collective Effects in Second-Harmonic Generation from Split-Ring-Resonator Arrays.pdf -

Photonic crystal waveguides intersection for resonant quantum dot optical spectroscopy detection

X. Song, S. Declair, T. Meier, A. Zrenner, J. Förstner, Optics Express (2012), 20(13), 14130-14136

Abstract

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Using a finite-difference time-domain method, we theoretically investigate the optical spectra of crossing perpendicular photonic crystal waveguides with quantum dots embedded in the central rod. The waveguides are designed so that the light mainly propagates along one direction and the cross talk is greatly reduced in the transverse direction. It is shown that when a quantum dot (QD) is resonant with the cavity, strong coupling can be observed via both the transmission and crosstalk spectrum. If the cavity is far off-resonant from the QD, both the cavity mode and the QD signal can be detected in the transverse direction since the laser field is greatly suppressed in this direction. This structure could have strong implications for resonant excitation and in-plane detection of QD optical spectroscopy.

Engineering high harmonic generation in semiconductors via pulse shaping

M. Reichelt, A. Hildebrandt, A. Walther, J. Förstner, T. Meier, in: Ultrafast Phenomena and Nanophotonics XVI, Proc. SPIE 8260, 2012, pp. 82601L

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Paper Abstract High harmonic generation is investigated for a two-band model of a semiconductor nanostructure. Similar to an atomic two-level system, the semiconductor emits high harmonic radiation. We show how one can specifically enhance the emission for a given frequency by applying a non-trivially shaped laser pulse. Therefore, the semiconductor Bloch equations including the interband and additionally the intraband dynamics are solved numerically and the spectral shape of the input pulse is computed via an optimization algorithm. It is demonstrated that desired emission frequencies can be favored even though the overall input power is kept constant. We also suggest special metallic nano geometries to achieve enhanced localized optical fields. They are found by geometric optimization.

Numerical analysis of coupled photonic crystal cavities

S. Declair, T. Meier, A. Zrenner, J. Förstner, Photonics and Nanostructures - Fundamentals and Applications (2011), 9(4), pp. 345-350

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We numerically investigate the interaction dynamics of coupled cavities in planar photonic crystal slabs in different configurations. The single cavity is optimized for a long lifetime of the fundamental mode, reaching a Q-factor of ≈43, 000 using the method of gentle confinement. For pairs of cavities we consider several configurations and present a setup with strongest coupling observable as a line splitting of about 30 nm. Based on this configuration, setups with three cavities are investigated.

Application of the Discontinuous Galerkin Time Domain Method to the Optics of Bi-Chiral Plasmonic Crystals

Y. Grynko, J. Förstner, T. Meier, A. Radke, T. Gissibl, P.V. Braun, H. Giessen, D.N. Chigrin, AIP, 2011, pp. 76-78

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A simulation environment for metallic nanostructures based on the Discontinuous Galerkin Time Domain method is presented. It is used to model optical transmission by silver bi‐chiral plasmonic crystals. The results of simulations qualitatively and quantitavely agree with experimental measurements of transmitted circular polarization.

Application of the discontinous Galerkin time domain method to the optics of metallic nanostructures

Y. Grynko, J. Förstner, T. Meier, AAPP | Atti della Accademia Peloritana dei Pericolanti (2011), 89(1), C1V89S1P041

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A simulation environment for metallic nanostructures based on the Discontinuous Galerkin Time Domain method is presented. The model is used to compute the linear and nonlinear optical response of split ring resonators and to study physical mechanisms that contribute to second harmonic generation.

2011 Grynko,Förstner,Meier_Application of the discontinous Galerkin time domain method to the optics of metallic nanostructures.pdf -

Electrong-factor anisotropy in symmetric (110)-oriented GaAs quantum wells

J. Hübner, S. Kunz, S. Oertel, D. Schuh, M. Pochwała, H.T. Duc, J. Förstner, T. Meier, M. Oestreich, Physical Review B (2011), 84(4), pp. 041301 (R)

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We demonstrate by spin quantum beat spectroscopy that in undoped symmetric (110)-oriented GaAs/AlGaAs single quantum wells, even a symmetric spatial envelope wave function gives rise to an asymmetric in-plane electron Land´e g-factor. The anisotropy is neither a direct consequence of the asymmetric in-plane Dresselhaus splitting nor a direct consequence of the asymmetric Zeeman splitting of the hole bands, but rather it is a pure higher-order effect that exists as well for diamond-type lattices. The measurements for various well widths are very well described within 14 × 14 band k·p theory and illustrate that the electron spin is an excellent meter variable for mapping out the internal—otherwise hidden—symmetries in two-dimensional systems. Fourth-order perturbation theory yields an analytical expression for the strength of the g-factor anisotropy, providing a qualitative understanding of the observed effects.

2011 Hübner,Kunz,Örtel,Schuh,Pochwala,Duc,Förstner,Meier,Östreich_Electron g -factor anisotropy in symmetric (110)-oriented GaAs quantum wells.pdf -

Theoretical approach to the ultrafast nonlinear optical response of metal slabs

M. Wand, A. Schindlmayr, T. Meier, J. Förstner, in: CLEO:2011 - Laser Applications to Photonic Applications , Optical Society of America, 2011

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WoS

We present an ab-initio method for calculating nonlinear and nonlocal optical effects in metallic slabs with sub-wavelength thickness. We find a strong localization of the second-harmonic current at the metal-vacuum interface.

Oscillatory excitation energy dependence of injection currents in GaAs/AlGaAs quantum wells

H. Thanh Duc, J. Förstner, T. Meier, S. Priyadarshi, A.M. Racu, K. Pierz, U. Siegner, M. Bieler, physica status solidi (c) (2011), 8(4), pp. 1137-1140

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The injection of photocurrents by femtosecond laser pulses in (110)-orientedGaAs/AlGaAs quantum wells is investigated theoretically and experimentally. The roomtemperature measurements show an oscillatory dependence of the injection current amplitude and direction on the excitation photon energy. Microscopic calculations using the semiconductor Bloch equations that are set up on the basis of k.p band structure calculations provide a detailed understanding of the experimental findings.

Simulation of the ultrafast nonlinear optical response of metal slabs

M. Wand, A. Schindlmayr, T. Meier, J. Förstner, Physica Status Solidi B (2011), 248(4), pp. 887-891

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WoS

We present a nonequilibrium ab initio method for calculating nonlinear and nonlocal optical effects in metallic slabs with a thickness of several nanometers. The numerical analysis is based on the full solution of the time‐dependent Kohn–Sham equations for a jellium system and allows to study the optical response of metal electrons subject to arbitrarily shaped intense light pulses. We find a strong localization of the generated second‐harmonic current in the surface regions of the slabs.

Numerical investigation of the coupling between microdisk modes and quantum dots

S. Declair, T. Meier, J. Förstner, physica status solidi (c) (2011), 8(4), pp. 1254-1257

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We numerically investigate the coupling between circular resonators and study strong light‐matter coupling of single as well as multiple circular resonators to quantum‐mechanical resonators in two dimensional model simulations. For all cases, the computed resonances of the coupled system as function of the detuning show anti‐crossings. The obtained mode splittings of coupled optical resonators are strongly depending on distance and cluster in almost degenerate eigenstates for large distances, as is known from coupled resonator optical waveguides. Vacuum Rabi splitting is observed for a quantum dot strongly coupled to eigenmodes of single perfectly cylindrical resonators.

Intensity-dependent ultrafast dynamics of injection currents in unbiased GaAs quantum wells

M. Pochwała, H.T. Duc, J. Förstner, T. Meier, physica status solidi (RRL) - Rapid Research Letters (2011), 5(3), pp. 119-121

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The intensity dependence of optically-induced injection currents in unbiased GaAs semiconductor quantum wells grown in [110] direction is investigated theoretically for a number of well widths. Our microscopic analysis is based on a 14 x 14 band k . p method in combination with the multisubband semiconductor Bloch equations. An oscillatory dependence of the injection current transients as function of intensity and time is predicted and explained. It is demonstrated that optical excitations involving different subbands and Rabi flopping are responsible for this complex dynamics.

Injection currents in (110)-oriented GaAs/AlGaAs quantum wells: recent progress in theory and experiment

H.T. Duc, M. Pochwala, J. Förstner, T. Meier, S. Priyadarshi, A.M. Racu, K. Pierz, U. Siegner, M. Bieler, in: Ultrafast Phenomena in Semiconductors and Nanostructure Materials XV, SPIE, 2011

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We experimentally and theoretically investigate injection currents generated by femtosecond single-color circularly-polarized laser pulses in (110)-oriented GaAs quantum wells. The current measurements are performed by detecting the emitted Terahertz radiation at room temperature. The microscopic theory is based on a 14 x 14 k • p band-structure calculation in combination with the multi-subband semiconductor Bloch equations. For symmetric GaAs quantum wells grown in (110) direction, an oscillatory dependence of the injection currents on the exciting photon energy is obtained. The results of the microscopic theory are in good agreement with the measurements.

Intensity dependence of optically-induced injection currents in semiconductor quantum wells

M. Pochwala, H.T. Duc, J. Förstner, T. Meier, in: CLEO:2011 - Laser Applications to Photonic Applications, OSA, 2011

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The intensity dependence of optically-induced injection currents in semiconductor quantum wells is investigated numerically. Oscillatory behavior of the electron charge current transients as function of intensity and time is predicted and explained.

Localization of excitons in weakly disordered semiconductor structures: A model study

N. Gögh, P. Thomas, I. Kuznetsova, T. Meier, I. Varga, Annalen der Physik (2010), pp. 905-909

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Localization of excitons in weakly disordered semiconductor structures: A model study

N. Gögh, P. Thomas, I. Kuznetsova, T. Meier, I. Varga, Annalen der Physik (2010), pp. 905-909

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Coherent control of a single exciton qubit by optoelectronic manipulation

S. Michaelis de Vasconcellos, S. Gordon, M. Bichler, T. Meier, A. Zrenner, Nature Photonics (2010), 4(8), pp. 545-548

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The coherent state manipulation of single quantum systems is a fundamental requirement for the implementation of quantum information processors. Exciton qubits are of particular interest for coherent optoelectronic applications, in particular due to their excellent coupling to photons. Until now, coherent manipulations of exciton qubits in semiconductor quantum dots have been performed predominantly by pulsed laser fields. Coherent control of the population of excitonic states with a single laser pulse, observed by Rabi oscillations, has been demonstrated by several groups using different techniques1,2,3. By using two laser pulses, more general state control can be achieved4, and coupling of two excitons has been reported5,6. Here, we present a conceptually new approach for implementing the coherent control of an exciton two-level system (qubit) by means of a time-dependent electric interaction. The new scheme makes use of an optical clock signal and a synchronous electric gate signal, which controls the coherent manipulation.