[{"type":"speech","title":"Few-photon-quantum transport through a photonic-crystal waveguide with a two-level system","issued":{"date-parts":[["2009"]]},"author":[{"family":"Longo","given":"P."},{"family":"Busch","given":"K."},{"family":"Schmitteckert","given":"P."}],"note":"Fr\u00fchjahrstagung DPG, Fachverband Halbleiterphysik, Dresden, 22.-27.M\u00e4rz 2009 Verhandlungen der Deutschen Physikalischen Gesellschaft, R.6, B.44(2009) HL 9.97","abstract":"Monday\nconductors, since they capture more and more \ufb01elds of application\n(e. g. light emitting diodes, organic photovoltaics). It is known that\nthe Einstein relation, which states that the ratio of the di\ufb00usion to\nthe mobility equals the thermal voltage, does not hold for organic\nsemiconductors with a gaussian density of states distribution. Deviations were observed in the case of high energetic disorder and low\ntemperatures. We studied these deviations by means of Monte Carlo\nsimulations, paying particular attention to the so far mostly neglected\nelectric \ufb01eld. We discuss the relevance of our \ufb01ndings to the physical\ndescription of organic devices.\nHL 9.96\nMon 14:30\nP2\nObservation of single quantum dots in GaAs\/AlAs micropillar cavities \u2014 \u2022Philipp Burger, Matthias Karl, Dongzhi Hu,\nDaniel M. Schaadt, Heinz Kalt, and Michael Hetterich \u2014 Institut f\u00a8 r Angewandte Physik and DFG Center for Functional Nanostrucu\ntures (CFN), Universit\u00a8t Karlsruhe (TH), 76128 Karlsruhe, Germany\nIn our contribution we present the fabrication steps of micropillar\ncavities and their optical properties. The layer structure consisting\nof a GaAs-based lambda-cavity sandwiched between two GaAs\/AlAs\ndistributed Bragg re\ufb02ectors is grown by molecular-beam epitaxy.\nIn(Ga)As quantum dots, emitting at around 950 nm, are embedded\nas optically active medium in the middle of the cavity. The pillars\nare milled out of this structure with a focused ion-beam. A confocal micro-photoluminescence set-up allows to measure optical cavity\nmodes as well as single quantum dots in the pillars when using low\nexcitation intensity. This enables us to observe a (thermal) shift of the\nsingle quantum dot peaks relative to the cavity mode. In addition, we\nincreased the numerical aperture of the set-up (originally 0.4) with a\nsolid immersion lens up to 0.8. Thus we are able to detect the fundamental mode of pillars with very small diameters. Furthermore, the\ncollection e\ufb03ciency increases substantially.\nHL 9.97\nMon 14:30\nP2\nFew-Photon-Quantum Transport Through a PhotonicCrystal Waveguide With A Two-Level System \u2014 \u2022Paolo\nLongo1 , Kurt Busch1,2 , and Peter Schmitteckert2 \u2014 1 Institut\nf\u00a8 r Theoretische Festk\u00a8rperphysik, Universit\u00a8t Karlsruhe (TH) \u2014\nQuantum optics in photonic crystals is a very fascinating \ufb01eld of research. Recent work [1] shows that scattering of a two-photon state\nwith a two-level impurity is qualitatively di\ufb00erent from single-particle\nphysics which e\ufb00ectively enables the possibility to induce interactions\nbetween photons.\nExact numerical studies of the interaction of a multi-photon, multimoded, quantized light \ufb01eld with a single two-level impurity are presented. The time evolution of photonic wave-packets, observables and\ncorrelation functions can be calculated by using a discrete \ufb01nite-lattice\nversion of a generalized Dicke-Hamiltonian.\nFor \ufb01rst considerations the Hamiltonian is reformulated as a tightbinding model,\nM \u22121\nX \u2020\n\u2126\nH = \u2212t\n(ai+1 ai + a\u2020 ai+1 ) + \u03c3z + V (a\u2020 \u03c3 \u2212 + al \u03c3 + ),\n2\ni=1\nwith which we evolute photonic quantum states in time in order to\ncalculate scattering properties of single- und multi-photon states.\n[1] J. T. Shen and S. Fan, Phys. Rev. Lett. 98, 153003 (2007).\nHL 9.98\nMon 14:30\nP2\n\u2014 Experimentelle Physik 4, Universitaet Wuerzburg, Am Hubland\nD-97074 Wuerzburg\nHL 9.99\nMon 14:30\nP2\nSources as an Extension of the Fourier Modal Method \u2014\n\u2022Christian Klock1 , Thomas Zebrowski1,2,3 , Sabine Essig1,2,3 ,\nUniversit\u00a8t Karlsruhe \u2014 2 Karlsruhe School of Optics & Photonics\n(KSOP) \u2014 3 DFG Center for Functional Nanostructures (CFN)\nThe Fourier Modal Method (FMM) enables the study of electromagnetic \ufb01eld distribution in structures with periodicity in the lateral\nplane. A nonlinear conformal coordinate mapping realizes absorbing\nboundaries and also allows us to treat aperiodic, \ufb01nite-sized structures.\nCommonly, the method is used to simulate a system\u2019s response to an\nincoming wave.\nOur poster illustrates how to extend the method to include the emission from line sources in 2D and point sources in 3D. We present comparisons of numerical and analytical \ufb01eld distributions for the case of\nan emitter in an in\ufb01nite dielectric cylinder. Furthermore, we demonstrate the method\u2019s potential for applications related to the designs of\nstructured, plasmonic enhanced light emitting diodes.\nHL 9.100\nMon 14:30\nP2\nModelling of metamaterials using a coupled dipole ap\u00a8\nTkeshelashvili1,3 , and Kurt Busch1,2,3 \u2014 1 Institut f\u00a8 r Theoretisu\nche Festk\u00a8rperphysik, Universit\u00a8t Karlsruhe \u2014 2 Karlsruhe School of\nOptics & Photonics (KSOP), Universit\u00a8t Karlsruhe \u2014 3 DFG Centrum\nf\u00a8r Funktionelle Nanostrukturen (CFN), Universit\u00a8t Karlsruhe\nControlling the properties of metamaterials using di\ufb00erent sizes and\nshapes of the basic building blocks, i.e. metallic nanostructures allows\nfor a far-reaching control of the e\ufb00ective material properties. Fully\nnumerical approaches via, e.g., the Fourier Modal method (FMM) or\nthe Finite Element Method that directly solve Maxwell\u2019s equations require sigini\ufb01cant computational resources and are usually not suitable\nWe present a coupled-dipole approach to metamaterials which allows\nfor e\ufb03cient parameter studies. The model contains few free parameters\nthat are determined by comparison with exact numerics via FMM for\nsimple systems such as periodic arrays of metallic rods. More complex\nstructures can be systematically constructed, thus providing physical\ninsights and allowing for rapid designs studies. We apply this approach\nto certain (chiral) multi-layer structures.\nHL 9.101\nMon 14:30\nP2\nTransmission line circuit analysis of split-ring resonator metamaterials \u2014 \u2022Liwei Fu, Heinz Schweizer, and Harald Giessen \u2014\n4th Physics Institute, University of Stuttgart, 70550 Stuttgart, Germany\nSplit-ring resonators (SRRs) are well studied due to their application potentials for superlenses, cloaking devices, perfect absorbers,\nand magnetic levitation. There are di\ufb00erent interpretations about the\ndependence of their resonance frequency on structure parameters using LC circuit models. However, these models can not explain the\nblue-shift of the resonance frequency with the metal thickness [1]. In\nthis report, we show that by distinguishing between series impedance\nand shunt admittance and by \ufb01tting the numerical results using transmission line circuit models [2,3], we can quantitatively d","kit-publication-id":"220075099"}]