@article{22955, abstract = {{The dynamics of 3D Airy-vortex wave packets is studied under the action of strong self-focusing Kerr nonlinearity. Emissions of nonlinear 3D waves out of the main wave packets with the topological charges were demonstrated. Because of the conservation of the total angular momentum, charges of the emitted waves are equal to those carried by the parental light structure. The rapid collapse imposes a severe limitation on the propagation of multidimensional waves in Kerr media. However, the structure of the Airy beam carrier allows the coupling of light from the leading, most intense peak into neighboring peaks and consequently strongly postpones the collapse. The dependence of the critical input amplitude for the appearance of a fast collapse on the beam width is studied for wave packets with zero and nonzero topological charges. Wave packets carrying angular momentum are found to be much more resistant to the rapid collapse.}}, author = {{Driben, Rodislav and Meier, Torsten}}, issn = {{0146-9592}}, journal = {{Optics Letters}}, number = {{19}}, pages = {{5539--5542}}, title = {{{Nonlinear dynamics of Airy-vortex 3D wave packets: emission of vortex light waves}}}, doi = {{10.1364/ol.39.005539}}, volume = {{39}}, year = {{2014}}, } @article{22954, abstract = {{The dynamics of two component-coupled vectorial Airy beams is investigated. In the linear propagation regime, a complete analytic solution describes the breather-like propagation of two components that feature nondiffracting self-accelerating Airy behavior. The superposition of two beams with different input properties opens the possibility of designing more complex nondiffracting propagation scenarios. In the strongly nonlinear regime, the dynamics remain qualitatively robust as is revealed by direct numerical simulations. Because of the Kerr effect, the two beams emit solitonic breathers whose coupling period is compatible with the remaining Airy-like beams. The results of this study are relevant for the description of photonic and plasmonic beams that propagate in coupled planar waveguides, as well as for birefrigent or multiwavelength beams.}}, author = {{Driben, R. and Konotop, V. V. and Meier, Torsten}}, issn = {{0146-9592}}, journal = {{Optics Letters}}, number = {{19}}, pages = {{5523--5526}}, title = {{{Coupled Airy breathers}}}, doi = {{10.1364/ol.39.005523}}, volume = {{39}}, year = {{2014}}, } @inproceedings{3939, abstract = {{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.}}, author = {{Hildebrandt, Andre and Reichelt, Matthias and Meier, Torsten and Förstner, Jens}}, booktitle = {{Ultrafast Phenomena and Nanophotonics XVIII}}, editor = {{Betz, Markus and Elezzabi, Abdulhakem Y. and Song, Jin-Joo and Tsen, Kong-Thon}}, keywords = {{tet_topic_opticalantenna}}, pages = {{89841G--8941G--6}}, publisher = {{SPIE}}, title = {{{Engineering plasmonic and dielectric directional nanoantennas}}}, doi = {{10.1117/12.2036588}}, volume = {{8984}}, year = {{2014}}, } @article{22958, abstract = {{Dispersion management of periodically alternating fiber sections with opposite signs of two leading dispersion terms is applied for the regeneration of self-accelerating truncated Airy pulses. It is demonstrated that for such a dispersion management scheme, the direction of the acceleration of the pulse is reversed twice within each period. In this scheme the system features light hot spots in the center of each fiber section, where the energy of the light pulse is tightly focused in a short temporal slot. Comprehensive numerical studies demonstrate a long-lasting propagation also under the influence of a strong fiber Kerr nonlinearity.}}, author = {{Driben, R. and Meier, Torsten}}, issn = {{1050-2947}}, journal = {{Physical Review A}}, number = {{4}}, title = {{{Regeneration of Airy pulses in fiber-optic links with dispersion management of the two leading dispersion terms of opposite signs}}}, doi = {{10.1103/physreva.89.043817}}, volume = {{89}}, year = {{2014}}, } @article{10036, author = {{Hölscher, Rebecca and Schmidt, Wolf Gero and Sanna, Simone}}, issn = {{1932-7447}}, journal = {{The Journal of Physical Chemistry C}}, pages = {{10213--10220}}, title = {{{Modeling LiNbO3 Surfaces at Ambient Conditions}}}, doi = {{10.1021/jp502936f}}, year = {{2014}}, } @article{13510, author = {{Hoffmann, Alexander and Rohrmüller, Martin and Jesser, Anton and dos Santos Vieira, Ines and Schmidt, Wolf Gero and Herres-Pawlis, Sonja}}, issn = {{0192-8651}}, journal = {{Journal of Computational Chemistry}}, number = {{29-30}}, pages = {{2146--2161}}, title = {{{Geometrical and optical benchmarking of copper(II) guanidine-quinoline complexes: Insights from TD-DFT and many-body perturbation theory (part II)}}}, doi = {{10.1002/jcc.23740}}, volume = {{35}}, year = {{2014}}, } @article{13509, author = {{Oh, Deok Mahn and Wippermann, S. and Schmidt, Wolf Gero and Yeom, Han Woong}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, number = {{15}}, title = {{{Oxygen adsorbates on the Si(111)4×1-In metallic atomic wire: Scanning tunneling microscopy and density-functional theory calculations}}}, doi = {{10.1103/physrevb.90.155432}}, volume = {{90}}, year = {{2014}}, } @article{13511, author = {{Landmann, M and Köhler, T and Rauls, E and Frauenheim, T and Schmidt, Wolf Gero}}, issn = {{0953-8984}}, journal = {{Journal of Physics: Condensed Matter}}, title = {{{The atomic structure of ternary amorphous TixSi1−xO2hybrid oxides}}}, doi = {{10.1088/0953-8984/26/25/253201}}, volume = {{26}}, year = {{2014}}, } @article{13513, author = {{Gerstmann, Uwe and Vollmers, N. J. and Lücke, A. and Babilon, M. and Schmidt, Wolf Gero}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, number = {{16}}, title = {{{Rashba splitting and relativistic energy shifts in In/Si(111) nanowires}}}, doi = {{10.1103/physrevb.89.165431}}, volume = {{89}}, year = {{2014}}, } @article{13516, author = {{Sanna, S. and Schmidt, Wolf Gero and Rode, S. and Klassen, S. and Kühnle, A.}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, number = {{7}}, title = {{{Unraveling theLiNbO3X-cut surface by atomic force microscopy and density functional theory}}}, doi = {{10.1103/physrevb.89.075403}}, volume = {{89}}, year = {{2014}}, } @article{13514, author = {{Li, Yanlu and Schmidt, Wolf Gero and Sanna, S.}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, number = {{9}}, title = {{{IntrinsicLiNbO3point defects from hybrid density functional calculations}}}, doi = {{10.1103/physrevb.89.094111}}, volume = {{89}}, year = {{2014}}, } @article{13512, author = {{Sanna, Simone and Schmidt, Wolf Gero and Thissen, Peter}}, issn = {{1932-7447}}, journal = {{The Journal of Physical Chemistry C}}, pages = {{8007--8013}}, title = {{{Formation of Hydroxyl Groups at Calcium-Silicate-Hydrate (C-S-H): Coexistence of Ca–OH and Si–OH on Wollastonite(001)}}}, doi = {{10.1021/jp500170t}}, volume = {{118}}, year = {{2014}}, } @article{13515, author = {{Sanna, S. and Hölscher, R. and Schmidt, Wolf Gero}}, issn = {{0169-4332}}, journal = {{Applied Surface Science}}, pages = {{70--78}}, title = {{{Temperature dependent LiNbO3(0001): Surface reconstruction and surface charge}}}, doi = {{10.1016/j.apsusc.2014.01.104}}, year = {{2014}}, } @article{13508, author = {{Guo, Q. and Paulheim, A. and Sokolowski, M. and Aldahhak, Hazem and Rauls, E. and Schmidt, Wolf Gero}}, issn = {{1932-7447}}, journal = {{The Journal of Physical Chemistry C}}, pages = {{29911--29918}}, title = {{{Adsorption of PTCDA on Terraces and at Steps Sites of the KCl(100) Surface}}}, doi = {{10.1021/jp509663s}}, volume = {{118}}, year = {{2014}}, } @article{15864, abstract = {{Starting from the extended Su-Schrieffer-Heeger model, multiband semiconductor Bloch equations are formulated in momentum space and applied to the analysis of the linear optical response of semiconducting carbon nanotubes (SCNTs). This formalism includes the coupling of electron-hole pair excitations between different valence and conduction bands, originating from the electron-hole Coulomb attraction. The influence of these couplings, which are referred to as nondiagonal interband Coulomb interaction (NDI-CI), on the linear excitonic absorption spectra is investigated and discussed for light fields polarized parallel to the tube direction. The results show that the intervalley NDI-CI leads to a significant increase of the band gap and a decrease of the exciton binding energy that results in a blueshift of the lowest-frequency excitonic absorption peak. The strength of these effects depends on the symmetry of the SCNT. Furthermore, for zigzag SCNTs with higher symmetry other nonintervalley NDI-CI terms also affect the spectral positions of excitonic absorption peaks.}}, author = {{Liu, Hong and Schumacher, Stefan and Meier, Torsten}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, number = {{15}}, title = {{{Influence of Coulomb-induced band couplings on linear excitonic absorption spectra of semiconducting carbon nanotubes}}}, doi = {{10.1103/physrevb.89.155407}}, volume = {{89}}, year = {{2014}}, } @inproceedings{15865, author = {{Lewandowski, P. and Ardizzone, V. and Tse, Y. C. and Kwong, N. H. and Luk, M. H. and Lücke, A. and Abbarchi, M. and Bloch, J. and Baudin, E. and Galopin, E. and Lemaître, A. and Leung, P. T. and Roussignol, Ph. and Binder, R. and Tignon, J. and Schumacher, Stefan}}, booktitle = {{Ultrafast Phenomena and Nanophotonics XVIII}}, editor = {{Betz, Markus and Elezzabi, Abdulhakem Y. and Song, Jin-Joo and Tsen, Kong-Thon}}, title = {{{Formation and control of transverse patterns in a quantum fluid of microcavity polaritons}}}, doi = {{10.1117/12.2037174}}, year = {{2014}}, } @article{7485, author = {{Wiebeler, Christian and Bader, Christina A. and Meier, Cedrik and Schumacher, Stefan}}, issn = {{1463-9076}}, journal = {{Phys. Chem. Chem. Phys.}}, number = {{28}}, pages = {{14531--14538}}, publisher = {{Royal Society of Chemistry (RSC)}}, title = {{{Optical spectrum, perceived color, refractive index, and non-adiabatic dynamics of the photochromic diarylethene CMTE}}}, doi = {{10.1039/c3cp55490b}}, volume = {{16}}, year = {{2014}}, } @article{15863, author = {{Vollbrecht, Joachim and Bock, Harald and Wiebeler, Christian and Schumacher, Stefan and Kitzerow, Heinz-Siegfried}}, issn = {{0947-6539}}, journal = {{Chemistry - A European Journal}}, pages = {{12026--12031}}, title = {{{Polycyclic Aromatic Hydrocarbons Obtained by Lateral Core Extension of Mesogenic Perylenes: Absorption and Optoelectronic Properties}}}, doi = {{10.1002/chem.201403287}}, year = {{2014}}, } @article{15861, author = {{Riesen, Hans and Wiebeler, Christian and Schumacher, Stefan}}, issn = {{1089-5639}}, journal = {{The Journal of Physical Chemistry A}}, pages = {{5189--5195}}, title = {{{Optical Spectroscopy of Graphene Quantum Dots: The Case of C132}}}, doi = {{10.1021/jp502753a}}, year = {{2014}}, } @article{15862, author = {{Wiebeler, Christian and Schumacher, Stefan}}, issn = {{1089-5639}}, journal = {{The Journal of Physical Chemistry A}}, pages = {{7816--7823}}, title = {{{Quantum Yields and Reaction Times of Photochromic Diarylethenes: Nonadiabatic Ab Initio Molecular Dynamics for Normal- and Inverse-Type}}}, doi = {{10.1021/jp506316w}}, year = {{2014}}, }