TY - CONF AU - Müller, Wolfgang AU - Kleinjohann, Bernd ID - 39582 T2 - Proceedings of the 2nd EXPRESS User's Group Conference TI - The EXPRESS Information Modeling Workbench - A New Approach to Graphical Design Environments ER - TY - JOUR AU - MEISSNER, E AU - Noé, Reinhold AU - BORCHERT, B AU - RODLER, H ID - 38499 IS - 25 JF - ELECTRONICS LETTERS SN - 0013-5194 TI - DIRECT MODULATION 565 MBIT/S OPTICAL PSK HETERODYNE SYSTEM WITH SOLITARY SL-QW-DFB LASERS USING NOVEL SUPPRESSION OF PHASE-TRANSITION PERIODS IN CARRIER RECOVERY VL - 28 ER - TY - JOUR AU - Noé, Reinhold AU - RODLER, H AU - EBBERG, A AU - MEISSNER, E AU - BODLAJ, V AU - DROGEMULLER, K AU - WITTMANN, J ID - 38495 IS - 1 JF - ELECTRONICS LETTERS SN - 0013-5194 TI - FULLY ENGINEERED COHERENT MULTICHANNEL TRANSMITTERS AND RECEIVERS WITH LOW-COST POTENTIAL VL - 28 ER - TY - JOUR AU - Noé, Reinhold AU - DROGEMULLER, K ID - 38492 IS - 5 JF - IEEE PHOTONICS TECHNOLOGY LETTERS SN - 1041-1135 TI - ACCURATE AND SIMPLE OPTICAL FREQUENCY STABILIZATION FOR A COHERENT MULTICHANNEL SYSTEM VL - 4 ER - TY - JOUR AU - Kitzerow, Heinz-Siegfried AU - Crooker, P. P. AU - Heppke, G. ID - 40009 IS - 1 JF - Liquid Crystals KW - Condensed Matter Physics KW - General Materials Science KW - General Chemistry SN - 0267-8292 TI - Chromaticity of polymer-dispersed cholesteric liquid crystals VL - 12 ER - TY - JOUR AU - Kitzerow, Heinz-Siegfried AU - Crooker, P. P. ID - 40013 IS - 4 JF - Liquid Crystals KW - Condensed Matter Physics KW - General Materials Science KW - General Chemistry SN - 0267-8292 TI - Behaviour of polymer dispersed cholesteric droplets with negative dielectric anisotropy in electric fields VL - 11 ER - TY - JOUR AU - Kitzerow, Heinz-Siegfried AU - Xu, F. AU - Crooker, P. P. ID - 40008 IS - 6 JF - Liquid Crystals KW - Condensed Matter Physics KW - General Materials Science KW - General Chemistry SN - 0267-8292 TI - Microscopic observations of axial and radial nematic droplets for a dual-frequency addressable liquid crystal VL - 12 ER - TY - JOUR AU - Noé, Reinhold AU - MEISSNER, E AU - BORCHERT, B AU - RODLER, H ID - 38493 IS - 10 JF - IEEE PHOTONICS TECHNOLOGY LETTERS SN - 1041-1135 TI - DIRECT MODULATION 565 MB/S DPSK EXPERIMENT WITH 62.3 DB LOSS SPAN AND ENDLESS POLARIZATION CONTROL VL - 4 ER - TY - JOUR AU - Kitzerow, Heinz-Siegfried AU - Crooker, P. P. AU - Rand, J. AU - Xu, J. AU - Heppke, G. ID - 40075 IS - 3 JF - Journal de Physique II KW - Physics and Astronomy (miscellaneous) KW - General Engineering KW - Atomic and Molecular Physics KW - and Optics SN - 1155-4312 TI - Electrostriction dynamics of blue phase II crystallites VL - 2 ER - TY - JOUR AU - Dolganov, V. K. AU - Heppke, G. AU - Kitzerow, Heinz-Siegfried ID - 40077 IS - 10 JF - Journal de Physique II KW - Physics and Astronomy (miscellaneous) KW - General Engineering KW - Atomic and Molecular Physics KW - and Optics SN - 1155-4312 TI - Dynamic response of a blue phase to an applied field VL - 2 ER - TY - JOUR AU - Kitzerow, Heinz-Siegfried AU - Rand, J. AU - Crooker, P. P. ID - 40078 IS - 2 JF - Journal de Physique II KW - Physics and Astronomy (miscellaneous) KW - General Engineering KW - Atomic and Molecular Physics KW - and Optics SN - 1155-4312 TI - Dynamics of polymer-dispersed cholesteric liquid crystals VL - 2 ER - TY - JOUR AU - Xu, F. AU - Kitzerow, Heinz-Siegfried AU - Crooker, P. P. ID - 40331 IS - 10 JF - Physical Review A KW - Atomic and Molecular Physics KW - and Optics SN - 1050-2947 TI - Electric-field effects on nematic droplets with negative dielectric anisotropy VL - 46 ER - TY - JOUR AU - Kitzerow, Heinz-Siegfried AU - Molsen, Henning AU - Heppke, Gerd ID - 40329 IS - 25 JF - Applied Physics Letters KW - Physics and Astronomy (miscellaneous) SN - 0003-6951 TI - Linear electro‐optic effects in polymer‐dispersed ferroelectric liquid crystals VL - 60 ER - TY - JOUR AU - Kitzerow, Heinz-Siegfried AU - Molsen, Henning AU - Heppke, Gerd ID - 40330 IS - 5 JF - Polymers for Advanced Technologies KW - Polymers and Plastics SN - 1042-7147 TI - Helical unwinding in polymer-dispersed ferroelectric liquid crystals VL - 3 ER - TY - JOUR AB - We investigated the switching behavior of the well-known antiferroelectric liquid crystal (R)-4-(1-methylheptyloxycarbonyl)phenyl-4'-octyloxybiphenyl-4-carboxylate (MHPOBC), embedded in a polymer matrix. The alignment of the liquid crystal in the UV-cured adhesive was controlled by mechanical shear during the polymerization-induced phase separation. Multistable switching with time constants down to 150 µs indicates that antiferroelectric PDLC devices are promissing for electrooptic application as flexible displays. AU - Molsen, Henning AU - Kitzerow, Heinz-Siegfried AU - Heppke, Gerd ID - 40328 IS - 8A JF - Japanese Journal of Applied Physics KW - General Physics and Astronomy KW - General Engineering SN - 0021-4922 TI - Antiferroelectric Switching in Polymer-Dispersed Liquid Crystals VL - 31 ER - TY - JOUR AU - Molsen, H. AU - Kitzerow, Heinz-Siegfried AU - Heppke, G. ID - 40515 JF - SID Digest of Technical Papers TI - Deformed-Helix Ferroelectric Effect in Polymer-Dispersed Ferroelectric Liquid Crystals VL - XXIII ER - TY - JOUR AU - Crooker, P. P. AU - Kitzerow, Heinz-Siegfried ID - 40514 JF - Condensed Matter News TI - Blue Phases VL - 1 ER - TY - JOUR AB - The authors present a detailed study of coherent tunneling oscillations of an optically excited electronic wavepacket in a semiconductor double quantum-well structure. The oscillation of the wavepacket between the two wells is traced by time-resolved pump-probe spectroscopy as well as time-resolved degenerate four-wave mixing. The experimental observations are compared with a simple theoretical model. The motion of the wave packet is studied as a function of both an external electric field and the lattice temperature. While the oscillation frequency shows the expected dependence on electric field, it increases with temperature at fixed electric field when perfectly delocalized electronic states exist at low temperature. AU - Meier, Torsten AU - Leo, K. AU - Shah, J. AU - Damen, T.C. AU - Schulze, A. AU - Schmitt-Rink, S. AU - Thomas, P. AU - Göbel, E.O. AU - Chuang, S.L. AU - Luo, M.S.C. AU - Schäfer, W. AU - Köhler, K. AU - Ganser, P. ID - 43444 IS - 10 JF - IEEE journal of quantum electronics SN - 0018-9197 TI - Dissipative Dynamics of an Electronic Wavepacket in a Semiconductor Double Well Potential VL - 28 ER - TY - JOUR AB - We report the study of optical dephazing of Wannier-Stark ladder excitations in a semiconductor superlattice by means of transient degenerate four-wave mixing. We observe pronounced modulations of the signal with a time period varying linearly with the electric field. The time period is found to equal the temporal periodicity of Bloch oscillations, in agreement with theory. In addition, we find that the dephazing time decreases with increasing localization of the Wannier-Stark states, which is attributed to carrier escape out of the lowest miniband. AU - Meier, Torsten AU - Feldmann, J. AU - Leo, K. AU - Shah, J. AU - Miller, D.A.B. AU - Cunningham, J.E. AU - von Plessen, G. AU - Schulze, A. AU - Thomas, P. AU - Schmitt-Rink, S. ID - 43443 IS - 11 JF - Physical Review B TI - Optical investigation of Bloch oscillations in a semiconductor superlattice VL - 46 ER - TY - JOUR AB - Femtosecond nonlinear laser spectroscopy is applied to study the dynamics of coherent optical excitations in semiconductors. In particular, excitonic excitations in quantum wells and superlattice structures are considered. Two examples demonstrate that four-wave mixing experiments with time-resolved detection of the nonlinear signal are able to distinguish between quantum beats and polarization interference.v AU - Meier, Torsten AU - Göbel, E.O. AU - Koch, M. AU - Feldmann, J. AU - von Plessen, G. AU - Schulze, A. AU - Thomas, P. AU - Schmitt-Rink, S. AU - Köhler, K. AU - Ploog, K. ID - 43445 IS - 1 JF - physica status solidi (b) TI - Time Resolved Four Wave Mixing in GaAs/AlAs Quantum Well Structures VL - 173 ER - TY - CONF AU - Hilleringmann, Ulrich AU - Adams, S AU - Goser, K ID - 39917 T2 - Proceedings ISSSE’92 TI - A Silicon Technology for Monolithic Integration of Optical Waveguides, Photodetectors and VLSI CMOS Circuits ER - TY - CONF AU - Adams, S AU - Hilleringmann, Ulrich AU - Goser, K ID - 39918 T2 - EFOC LAN TI - Electrooptical coupling of waveguides and VLSI circuits integrated on one silicon chip ER - TY - JOUR AU - Schroeter-Wittke, Harald ID - 43483 JF - Der Evangelische Erzieher TI - Michel plays Petrucciani. Oder: "So wenig sind wir auf uns selbst gestellt." Oder: Praktisch-theologische Wahr-Nehmungen in dem "Spielraum von Schnitten" VL - 44 ER - TY - CONF AB - Summary form only given. The numerical investigations are based on a microscopic many-body theory which allows one to compute the linear and nonlinear optical properties of semiconductor superlattices in the presence of homogeneous electric fields applied in the growth direction. The THz-emission due to the field-driven dynamics of photoexcited carriers is investigated for the combined action of static and alternating fields. For a driving field it was shown within a simple model that the equations governing the intraband dynamics in the field-driven superlattice should be analogous to the ones describing the superconducting Josephson junction. The transport properties in this regime can be described by the picture of multi-photon-assisted tunneling between Wannier-Stark states. AU - Meier, Torsten AU - Thomas, P. AU - Koch, S.W. ID - 44291 SN - 1-55752-576-X T2 - Technical Digest. Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference TI - THz-emission from photoexcited semiconductor superlattices with applied ac and dc electric fields ER - TY - CONF AB - Summary form only given. Partly non-degenerate four-wave mixing is able to detect coherent coupling between excitonic resonances like e.g. light-hole and heavy-hole excitons or between an exciton and its continuum states. We apply an extension of this method, which we call selective coherent spectroscopy (SCS), to symmetrically strained (GaIn)As/Ga(PAs) multiple quantum-wells. The samples are excited simultaneously by a picosecond pulse with wavevector k/sub 1/ and a 100 fs pulse with wavevector k/sub 2/. The central wavelength of the picosecond pulse is scanned over the entire spectrum of the 100 fs pulse and the four-wave mixing signal in the direction 2k/sub 2/-k/sub 1/ is detected at a fixed energy. This scan provides an SCS spectrum. AU - Meier, Torsten AU - Euteneuer, A. AU - Finger, E. AU - Hofmann, M. AU - Stolz, W. AU - Thomas, P. AU - Koch, S.W. AU - Ruhle, W.W. ID - 44292 T2 - Technical Digest. Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference TI - Distribution of exciton binding-energies in disordered semiconductor quantum-wells ER - TY - CONF AB - Summary form only given. For a proper understanding of nonlinear optical experiments in semiconductors even the low-density limit Coulomb-induced many body correlations beyond the Hartree-Fock decoupling scheme need to be considered. In the coherent X(3) limit these correlations manifest themselves in the contributions of bound and unbound two-exciton states to the optical response. The understanding of nonlinear excitonic effects in the Stark effect of semiconductors including carrier-correlations is still of fundamental interest. AU - Meier, Torsten AU - Sieh, C. AU - Koch, S.W. AU - Brick, P. AU - Hubner, M. AU - Ell, C. AU - Prineas, J. AU - Khitrova, G. AU - Gibbs, H.M. ID - 44290 SN - 1-55752-576-X T2 - Technical Digest. Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference TI - Influence of carrier-correlations on the optical Stark effect of semiconductors ER - TY - CONF AB - Recent experiments by Roskos et al. in ultrashort optical pulse excitation of biased coupled quantum wells have shown remarkable generation of terahertz electromagnetic radiation. Two different effects were identified: (i) an oscillatory field of frequency corresponding to the separation between the coupled levels in the quantum-well pair (~ 1.5 THz); and (ii) an “instantaneous” electromagnetic field pulse that appears to follow the time evolution of the exciting laser pulse. The oscillatory field is understood to be caused by the coherent oscillation of optically created electrons from one well to the other.[1] The “instantaneous” part we believe is caused by a new mechanism proposed in Ref. 2. The essence of this “instantaneous” mechanism is that electron-hole pairs are created in a biased semiconductor with a net polarization. The density of these pairs follows the light field, as does the induced polarization, hence, generating an electromagnetic source that follows the light pulse. Such mechanisms have been discussed before for photon energies below the optical bandgap energy,[3] although they have so far been difficult to observe. In our work, we have generalized and extended such effects to photon energies above the handgap energy. In this paper we will discuss both of these mechanisms as well as the fourwave-mixing (FWM) signal,[4] and show how they can be understood within one unified formalism. We will also show that the calculations agree well with the experimental results. AU - Meier, Torsten AU - Schulze, A. AU - Scmittrink, S. AU - Thomas, P. AU - Chuang, S.L. ID - 44289 T2 - International Quantum Electronics Conference TI - Terahertz Electromagnetic Pulse Generation and Four-Wave Mixing in Coupled Quantum Wells ER - TY - CONF AB - In the presence of a homogeneous electric field, 𝐹→, each Bloch state in a crystal changes quasimomentum according to the so-called acceleration theorem Thus, in the absence of interband tunneling and scattering processes, each Bloch state moves at a constant velocity in k-space and executes a periodic motion in the reduced zone scheme by undergoing a Bragg reflection between each two traversals of the Brillouin zone. AU - Meier, Torsten AU - von Plessen, G. AU - Schulze, A. AU - Thomas, P. ID - 44288 T2 - International Quantum Electronics Conference TI - On the Observability of Bloch Oscillations in Time-Resolved Four-Wave-Mixing ER - TY - GEN AU - Herzig, Bardo ID - 45259 TI - Entwurf einer Benutzeroberfläche für die Analyse von kontextfreien und DCG - Grammatiken und ihre didaktische Verwendung. Erste Staatsarbeit im Fach Informatik ER - TY - CONF AU - Jonas-Ahrend, Gabriela ID - 47608 TI - Physics Education in East and West Germany ER - TY - CHAP AU - Eke, Norbert Otto ED - Schöwerling, Rainer ED - Steinecke, Hartmut ED - Eke, Norbert Otto ED - Tiggesbäumker, Günter ID - 19432 T2 - Die Fürstliche Bibliothek Corvey. Ihre Bedeutung für eine neue Sicht der Literatur des frühen 19. Jahrhunderts. Beiträge des 1. Internationalen Corvey-Symposions. 25.-27. Oktober 1990 in Paderborn TI - „Wie wird künftig Meusel die hungrige Nachwelt hetzen und peinigen“. Deutsche Romane 1815-1830 in der Fürstlichen Bibliothek Corvey. Vorläufiges zum Forschungsprojekt „Der deutsche Roman 1815-1830" ER - TY - CHAP AB - Angaben zur Herausgeberschaft: Hg. von Rainer Schöwerling und Hartmut Steinecke unter Mitarbeit von Norbert Otto Eke und Günter Tiggesbäumker AU - Eke, Norbert Otto ED - Schöwerling, Rainer ED - Steinecke, Hartmut ED - Eke, Norbert Otto ED - Tiggesbäumker, Günter ID - 19488 T2 - Die Fürstliche Bibliothek Corvey. Ihre Bedeutung für eine neue Sicht der Literatur des frühen 19. Jahrhunderts. Beiträge des 1. Internationalen Corvey-Symposions. 25.-27. Oktober 1990 in Paderborn TI - Diskussionsberichte zu den Sektionen 2 („Roman“) und 3 („Dramen“) sowie der Abschlußdiskussion des 1. Internationalen Corvey-Symposions ER - TY - BOOK AB - Präzisierung der Herausgeberschaft: Hg. von Rainer Schöwerling und Hartmut Steinecke unter Mitarbeit von Norbert Otto Eke und Günter Tiggesbäumker ED - Schöwerling, Rainer ED - Steinecke, Hartmut ED - Eke, Norbert Otto ED - Tiggesbäumker, Günter ID - 19091 TI - Die Fürstliche Bibliothek Corvey. Ihre Bedeutung für eine neue Sicht der Literatur des frühen 19. Jahrhunderts. Beiträge des 1. Internationalen Corvey-Symposions. 25.-27. Oktober 1990 in Paderborn ER - TY - GEN AU - Hilgert, Joachim ID - 51585 T2 - JBer. DMV TI - Fomenko, A.T. Symplectic Geometry (Gordon and Breach, 1988) VL - 94 ER - TY - JOUR AU - Hilgert, Joachim AU - Ólafsson, G. ID - 51442 JF - Japan. J. Math. TI - Analytic Extensions of Representations, the Solvable Case VL - 18 ER - TY - JOUR AU - Hilgert, Joachim ID - 51443 JF - Math. Zeitschrift TI - Controllability on Real Reductive Groups VL - 209 ER - TY - JOUR AU - Flögel, A. AU - Kleine Büning, H. AU - Lettmann, Theodor ID - 19814 JF - RAIRO - Theoretical Informatics and Applications SN - 0988-3754 TI - On the restricted equivalence for subclasses of propositional logic ER - TY - GEN AU - Simon, Jens ID - 2453 TI - Benutzung virtueller Topologien unter PARIX ER - TY - GEN AU - Röttger, Markus AU - Simon, Jens AU - Schroeder, Ulf-Peter ID - 2454 TI - Virtual Topology Library for PARIX ER - TY - GEN AU - Diekmann, Ralf AU - Lüling, Reinhard AU - Simon, Jens ID - 2455 TI - Problem Independent Distributed Simulated Annealing and its Applications ER - TY - CHAP AU - Diekmann, Ralf AU - Simon, Jens ID - 2456 SN - 978-3-642-46787-5 T2 - Applied Simulated Annealing TI - Problem Independent Distributed Simulated Annealing and its Applications VL - 396 ER - TY - GEN AU - Blömer, Johannes ID - 3045 TI - On Kummer theory and the number of roots of unity in radical extensions of Q ER - TY - JOUR AU - Gries, Thomas AU - Wigger, B. ID - 3069 IS - 4 JF - Economia Internationale TI - The Dynamics of Upgrading or how to catch-up VL - 46 ER - TY - BOOK AU - Fuchssteiner, Benno AU - Wiwianka, W. AU - Gottheil, K. AU - Kemper, A. AU - Kluge, O. AU - Morisse, K. AU - Naundorf, H. AU - Oevel, Gudrun AU - Schulze, T. ID - 17302 TI - MuPAD: Multi Processing Algebra Data Tool; Benutzerhandbuch; MuPAD Version 1.1 ER - TY - CONF AU - Peckhaus, Volker ED - Stelzner, Werner ID - 17476 T2 - Philosophie und Logik. Frege-Kolloquien Jena 1989/1991 TI - Ernst Schröder und der Logizismus VL - 3 ER - TY - BOOK ED - Meyer auf der Heide, Friedhelm ED - Monien, B. ED - Rosenberg, A. L. ID - 17477 SN - 0302-9743 TI - Parallel Architectures and Their Efficient Use ER - TY - CHAP AU - Peckhaus, Volker ED - Haller, Rudolf ED - Stadler, Friedrich ID - 17478 T2 - Wien—Berlin—Prag. Der Aufstieg der wissenschaftlichen Philosophie. Zentenarien Rudolf Carnap–Hans Reichenbach–Edgar Zilsel TI - Kurt Grelling und der Logische Empirismus VL - 2 ER - TY - CONF AU - Kastens, Uwe AU - Meyer auf der Heide, Friedhelm AU - Wachsmann, Alf AU - Wichmann, Friedrich ID - 17479 T2 - Proc. 3rd PASA Workshop, PARS Mitteilungen TI - OCCAM-light: A Language Combining Shared Memory and Message Passing (A First Report) ER - TY - JOUR AB - Page 4 AU - Peckhaus, Volker ID - 19046 IS - 4 JF - The Mathematical Intelligencer TI - Fotografie: Ivor Grattan-Guinness (Erlangen, 21.2.1989) VL - 15 ER - TY - BOOK ED - Eke, Norbert Otto ED - Helmes, Günter ID - 19090 TI - Richard Beer-Hofmann (1866-1945). Studien zu seinem Werk ER -