@article{39740, author = {{Urbanski, Martin and Kinkead, Brandy and Hegmann, Torsten and Kitzerow, Heinz-Siegfried}}, issn = {{0267-8292}}, journal = {{Liquid Crystals}}, keywords = {{Condensed Matter Physics, General Materials Science, General Chemistry}}, number = {{9}}, pages = {{1151--1156}}, publisher = {{Informa UK Limited}}, title = {{{Director field of birefringent stripes in liquid crystal/nanoparticle dispersions}}}, doi = {{10.1080/02678292.2010.489160}}, volume = {{37}}, year = {{2010}}, } @article{39741, author = {{Kitzerow, Heinz-Siegfried}}, issn = {{0015-0193}}, journal = {{Ferroelectrics}}, keywords = {{Condensed Matter Physics, Electronic, Optical and Magnetic Materials}}, number = {{1}}, pages = {{66--85}}, publisher = {{Informa UK Limited}}, title = {{{Blue Phases: Prior Art, Potential Polar Effects, Challenges}}}, doi = {{10.1080/00150191003683807}}, volume = {{395}}, year = {{2010}}, } @article{39974, author = {{Kitzerow, Heinz-Siegfried}}, issn = {{1358-314X}}, journal = {{Liquid Crystals Today}}, keywords = {{Materials Chemistry, Inorganic Chemistry, Condensed Matter Physics}}, number = {{4}}, pages = {{3--7}}, publisher = {{Informa UK Limited}}, title = {{{Tunable photonic crystals}}}, doi = {{10.1080/1464518021000069229}}, volume = {{11}}, year = {{2010}}, } @article{39972, author = {{Kitzerow, Heinz-Siegfried}}, issn = {{1439-9598}}, journal = {{Nachrichten aus der Chemie}}, keywords = {{General Chemical Engineering, General Chemistry}}, number = {{6}}, pages = {{678--679}}, publisher = {{Wiley}}, title = {{{33. Arbeitstagung Flüssigkristalle}}}, doi = {{10.1002/nadc.20050530635}}, volume = {{53}}, year = {{2010}}, } @article{39739, abstract = {{ The electrooptic characteristics of the field-induced reorientation of a nematic liquid crystal are studied using graphene layers as transparent conductive electrodes. The covering of a large area with highly conductive graphene was achieved by the thermal reduction of a graphene oxide film. The conductivity of the graphene electrode provides electrooptic properties that are comparable to those of liquid crystal cells with two conventional indium tin oxide electrodes. This result confirms earlier studies and suggestions concerning graphene-based liquid crystal devices. It demonstrates that the fabrication of graphene layers via the deposition and subsequent reduction of graphene oxide is suitable for liquid crystal applications. }}, author = {{Nordendorf, Gaby and Kasdorf, Olga and Kitzerow, Heinz-Siegfried and Liang, Yanyu and Feng, Xinliang and Müllen, Klaus}}, issn = {{0021-4922}}, journal = {{Japanese Journal of Applied Physics}}, keywords = {{General Physics and Astronomy, General Engineering}}, number = {{10R}}, publisher = {{IOP Publishing}}, title = {{{Liquid Crystal Addressing by Graphene Electrodes Made from Graphene Oxide}}}, doi = {{10.1143/jjap.49.100206}}, volume = {{49}}, year = {{2010}}, } @article{39738, author = {{Urbanski, Martin and Kinkead, Brandy and Qi, Hao and Hegmann, Torsten and Kitzerow, Heinz-Siegfried}}, issn = {{2040-3364}}, journal = {{Nanoscale}}, keywords = {{General Materials Science}}, number = {{7}}, publisher = {{Royal Society of Chemistry (RSC)}}, title = {{{Electroconvection in nematic liquid crystals via nanoparticle doping}}}, doi = {{10.1039/c0nr00139b}}, volume = {{2}}, year = {{2010}}, } @article{39737, author = {{Lorenz, Alexander and Schuhmann, Rolf and Kitzerow, Heinz-Siegfried}}, issn = {{0003-6935}}, journal = {{Applied Optics}}, number = {{20}}, publisher = {{The Optical Society}}, title = {{{Switchable waveguiding in two liquid-crystal-filled photonic crystal fibers}}}, doi = {{10.1364/ao.49.003846}}, volume = {{49}}, year = {{2010}}, } @inproceedings{39736, author = {{Kinkead, Brandy and Urbanski, Martin and Qi, Hao and Kitzerow, Heinz-Siegfried and Hegmann, Torsten}}, booktitle = {{SPIE Proceedings}}, editor = {{Khoo, Iam Choon}}, issn = {{0277-786X}}, publisher = {{SPIE}}, title = {{{Alignment and electrooptic effects in nanoparticle-doped nematic liquid crystals}}}, doi = {{10.1117/12.858831}}, year = {{2010}}, } @article{39745, author = {{Kasdorf, Olga and Kitzerow, Heinz-Siegfried and Lenoble-Zwahlen, Julie and Deschenaux, Robert}}, issn = {{0021-4922}}, journal = {{Japanese Journal of Applied Physics}}, keywords = {{General Physics and Astronomy, Physics and Astronomy (miscellaneous), General Engineering}}, number = {{1}}, publisher = {{IOP Publishing}}, title = {{{Influence of a Mesogenic Dendrimer on the Morphology of Polymer–Fullerene Composites for Photovoltaics}}}, doi = {{10.1143/jjap.49.01af01}}, volume = {{49}}, year = {{2010}}, } @article{39743, author = {{Lorenz, Alexander and Schuhmann, Rolf and Kitzerow, Heinz-Siegfried}}, issn = {{1094-4087}}, journal = {{Optics Express}}, keywords = {{Atomic and Molecular Physics, and Optics}}, number = {{4}}, publisher = {{The Optical Society}}, title = {{{Infiltrated photonic crystal fiber: experiments and liquid crystal scattering model}}}, doi = {{10.1364/oe.18.003519}}, volume = {{18}}, year = {{2010}}, } @article{40082, author = {{Kitzerow, Heinz-Siegfried}}, issn = {{0015-0193}}, journal = {{Ferroelectrics}}, keywords = {{Condensed Matter Physics, Electronic, Optical and Magnetic Materials}}, number = {{1}}, pages = {{66--85}}, publisher = {{Informa UK Limited}}, title = {{{Blue Phases: Prior Art, Potential Polar Effects, Challenges}}}, doi = {{10.1080/00150191003683807}}, volume = {{395}}, year = {{2010}}, } @article{4123, abstract = {{GaAs-based semiconductor microdisks with high quality whispering gallery modes (Q44000) have been fabricated.A layer of self-organized InAs quantumdots (QDs) served as a light source to feed the optical modes at room temperature. In order to achieve frequency tuning of the optical modes, the microdisk devices have been immersed in 4 – cyano – 4´-pentylbiphenyl (5CB), a liquid crystal(LC) with a nematic phase below the clearing temperature of TC≈34°C .We have studied the device performance in the temperature rangeof T=20-50°C, in order to investigate the influence of the nematic–isotropic phase transition on the optical modes. Moreover,we havea pplied an AC electric field to the device,which leads in the nematic phase to a reorientation of the anisotropic dielectric tensor of the liquid crystal.This electrical anisotropy can be used to achieve electrical tunability of the optical modes.Using the finite-difference time domain (FDTD) technique with an anisotropic material model, we are able to describe the influence of the liquid crystal qualitatively.}}, author = {{Piegdon, Karoline A. and Offer, Matthias and Lorke, Axel and Urbanski, Martin and Hoischen, Andreas and Kitzerow, Heinz-Siegfried and Declair, Stefan and Förstner, Jens and Meier, Torsten and Reuter, Dirk and Wieck, Andreas D. and Meier, Cedrik}}, issn = {{1386-9477}}, journal = {{Physica E: Low-dimensional Systems and Nanostructures}}, keywords = {{tet_topic_qd, tet_topic_microdisk}}, number = {{10}}, pages = {{2552--2555}}, publisher = {{Elsevier BV}}, title = {{{Self-assembled quantum dots in a liquid-crystal-tunable microdisk resonator}}}, doi = {{10.1016/j.physe.2009.12.051}}, volume = {{42}}, year = {{2010}}, } @article{4172, abstract = {{Microdisks made from GaAs with embedded InAs quantum dots are immersed in the liquid crystal 4-cyano-4’-pentylbiphenyl (5CB). The quantum dots serve as emitters feeding the optical modes of the photonic cavity. By changing temperature, the liquid crystal undergoes a phase transition from the isotropic to the nematic state, which can be used as an effective tuning mechanism of the photonic modes of the cavity. In the nematic state, the uniaxial electrical anisotropy of the liquid crystal molecules can be exploited for orienting the material in an electric field, thus externally controlling the birefringence of the material. Using this effect, an electric field induced tuning of the modes is achieved. Numerical simulations using the finite-differences time-domain (FDTD) technique employing an anisotropic dielectric medium allow to understand the alignment of the liquid crystal molecules on the surface of the microdisk resonator.}}, author = {{Piegdon, Karoline A. and Declair, Stefan and Förstner, Jens and Meier, Torsten and Matthias, Heiner and Urbanski, Martin and Kitzerow, Heinz-Siegfried and Reuter, Dirk and Wieck, Andreas D. and Lorke, Axel and Meier, Cedrik}}, issn = {{1094-4087}}, journal = {{Optics Express}}, keywords = {{tet_topic_qd, tet_topic_microdisk}}, number = {{8}}, publisher = {{The Optical Society}}, title = {{{Tuning quantum-dot based photonic devices with liquid crystals}}}, doi = {{10.1364/oe.18.007946}}, volume = {{18}}, year = {{2010}}, } @article{39752, author = {{Lorenz, A. and Kitzerow, Heinz-Siegfried and Schwuchow, A. and Kobelke, J. and Bartelt, H.}}, issn = {{1094-4087}}, journal = {{Optics Express}}, keywords = {{Atomic and Molecular Physics, and Optics}}, number = {{23}}, publisher = {{The Optical Society}}, title = {{{Photonic crystal fiber with a dual-frequency addressable liquid crystal: behavior in the visible wavelength range}}}, doi = {{10.1364/oe.16.019375}}, volume = {{16}}, year = {{2009}}, } @article{39748, author = {{Matthias, H. and Kitzerow, Heinz-Siegfried}}, issn = {{1542-1406}}, journal = {{Molecular Crystals and Liquid Crystals}}, keywords = {{Condensed Matter Physics, General Materials Science, General Chemistry}}, number = {{1}}, pages = {{127/[489]--136/[498]}}, publisher = {{Informa UK Limited}}, title = {{{Director Fields Around Spherical and Cylindrical Micro Particles in a Liquid Crystal Host}}}, doi = {{10.1080/15421400903060300}}, volume = {{508}}, year = {{2009}}, } @article{39747, author = {{Hoischen, A. and Benning, S. A. and Kitzerow, Heinz-Siegfried}}, issn = {{0021-8979}}, journal = {{Journal of Applied Physics}}, keywords = {{General Physics and Astronomy}}, number = {{1}}, publisher = {{AIP Publishing}}, title = {{{Electroconvection of liquid crystals: Tool for fabricating modulated polymer surfaces}}}, doi = {{10.1063/1.3055398}}, volume = {{105}}, year = {{2009}}, } @inproceedings{39746, author = {{Kitzerow, Heinz-Siegfried}}, booktitle = {{SPIE Proceedings}}, editor = {{Chien, Liang-Chy and Wu, Ming Hsien}}, issn = {{0277-786X}}, publisher = {{SPIE}}, title = {{{Blue phases come of age: a review}}}, doi = {{10.1117/12.813372}}, year = {{2009}}, } @inproceedings{40639, author = {{Goodby, J. W. and Bates, M. and Saez, I. M. and Gorecka, E. and Kitzerow, Heinz-Siegfried and Guillon, D. and Donnio, B. and Serrano, J.-L. and Deschenaux, R.}}, booktitle = {{Mater. Res. Soc. Symp. Proc. 1134}}, editor = {{Cheng, Z. and Zhang, Q. and Bauer, S. and Wrobleski, D. A.}}, title = {{{Liquid Crystal Nano-particles, LCNANOP – a SONS II Collaborative Research Project}}}, volume = {{1134}}, year = {{2009}}, } @inproceedings{4181, abstract = {{We experimentally and theoretically investigate microdisk resonators with embedded quantum dots immersed in a liquid crystal in its nematic phase, showing the tunabililty of the photonic modes via external parameters like temperature or electric field.}}, author = {{Förstner, Jens and Meier, Cedrik and Piegdon, Karoline and Declair, Stefan and Hoischen, Andreas and Urbanski, Mark and Meier, Torsten and Kitzerow, Heinz-Siegfried}}, booktitle = {{Advances in Optical Sciences Congress}}, isbn = {{9781557528735}}, keywords = {{tet_topic_microdisk}}, location = {{Honolulu, Hawaii United States}}, publisher = {{OSA Technical Digest (CD) (Optical Society of America, 2009), paper NTuC2}}, title = {{{Coupling Dynamics of Quantum Dots in a Liquid-Crystal-Tunable Microdisk Resonator}}}, doi = {{10.1364/nlo.2009.ntuc2}}, year = {{2009}}, } @inproceedings{7642, author = {{Piegdon, Karoline A. and Matthias, Heinrich and Meier, Cedrik and Kitzerow, Heinz-Siegfried}}, booktitle = {{Emerging Liquid Crystal Technologies III}}, editor = {{Chien, Liang-Chy}}, publisher = {{SPIE}}, title = {{{Tunable optical properties of photonic crystals and semiconductor microdisks using liquid crystals}}}, doi = {{10.1117/12.774194}}, year = {{2008}}, }