Prof. Heinz S. Kitzerow Profile

Prof. Heinz S. Kitzerow

at Univ Paderborn

SPIE Involvement:

Conference Program Committee | Author

Proceedings Article | 24 January 2019 Paper

Improved organic thin-film transistor performance by dielectric layer patterning

Thorsten Meyers, Julia Reker, Julian Temme, Fábio Vidor, Joachim Vollbrecht, Heinz Kitzerow, Jan Paradies, Ulrich Hilleringmann

Proceedings Volume 11043, 1104314 (2019) https://doi.org/10.1117/12.2500286

KEYWORDS: Dielectrics, Semiconductors, Gold, Electrodes, Photoresist materials, Indium oxide, Semiconducting wafers, Thin films, Transistors, Optical lithography

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Proceedings Article | 5 March 2013 Paper

Liquid crystal lasers: recent advances

Juergen Schmidtke, Lu Lu, Heinz-S. Kitzerow, Eugene Terentjev

Proceedings Volume 8642, 864209 (2013) https://doi.org/10.1117/12.2008373

KEYWORDS: Liquid crystals, Electrodes, Laser applications, Distortion, Dielectrics, Laser stabilization, Anisotropy, Liquid crystal lasers, Light sources, Lab on a chip

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Proceedings Article | 11 February 2012 Paper

New developments in nanoparticle-liquid crystal composites: from magic-sized semiconductor nanoclusters to alignment pattern formation via nanoparticle stenciling

Javad Mirzaei, Ryan Sawatzky, Anshul Sharma, Martin Urbanski, Kui Yu, Heinz-S. Kitzerow, Torsten Hegmann

Proceedings Volume 8279, 827913 (2012) https://doi.org/10.1117/12.909022

KEYWORDS: Gold, Liquid crystals, Glasses, Optical alignment, Semiconductors, Nanoparticles, Electro optics, Transmission electron microscopy, Quantum dots, Photomicroscopy

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We here report on the alignment and electro-optic properties of nematic liquid crystals (LCs) either containing nanoscale particles as additives or featuring particles patterned on substrates. The investigated nematic LCs or LC dispersions are doped or in contact with magic-sized semiconductor CdSe nanocrystals (MSNCs) or silane- and alkylthiol monolayercapped gold nanoparticles. Three single-sized CdSe quantum dots capped with myristic acid exhibiting bright bandgap photoluminescence (PL) at λ_max ~ 463 nm were tested as additives. Two of the quantum dots only vary in the amount of defects as indicated by different bandgap and deep trap PL. The third MSNC sample is compositionally different, doped with Zn. These MSNCs with almost identical sizes were doped at different concentrations (1-5 wt%) into the nematic phase of the 2-phenylpyrimidine-based LC1. Only the Zn-doped MSNCs showed the formation of birefringent stripes surrounded by areas of homeotropic alignment between plain glass slides at all concentrations as observed for many other nanoparticle-doped nematic LCs reported earlier by our group. In polyimide-coated glass slides favoring planar orientation of the nematic director, planar alignment was observed. Similarly, siloxane-coated gold nanoparticle additives with narrow size distribution, but larger size, show homeotropic alignment between plain glass and planar alignment in rubbed polyimide-coated cells. Surprisingly then, we succeeded in creating alignment patterns using smaller, ~2 nm alkylthiol-capped gold nanoparticles using a process called stenciling that allowed us to generate patterns of homeotropic alignment in a continuum of planar alignment of the nematic LC. Finally, electro-optic investigations on some of these samples revealed that only the Zn-doped magic-sized MSNCs significantly lower the dielectric anisotropy as well as the splay elastic constant of the nematic host, despite identical size and surface functionality of the three used MSNCs, which highlights the tremendous effect of the nanocrystal core composition on the electro-optic properties of the nematic host.

Proceedings Article | 18 August 2010 Paper

Alignment and electrooptic effects in nanoparticle-doped nematic liquid crystals

Brandy Kinkead, Martin Urbanski, Hao Qi, Heinz-S. Kitzerow, Torsten Hegmann

Proceedings Volume 7775, 77750C (2010) https://doi.org/10.1117/12.858831

KEYWORDS: Liquid crystals, Nanoparticles, Electro optics, Liquids, Crystals, Quantum dots, Switching, Luminescence, Glasses, Anisotropy

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Proceedings Article | 3 February 2009 Paper

Blue phases come of age: a review

Heinz-Siegfried Kitzerow

Proceedings Volume 7232, 723205 (2009) https://doi.org/10.1117/12.813372

KEYWORDS: Liquid crystals, Crystals, Dielectrics, Liquids, Electrostriction, Temperature metrology, Anisotropy, Polymers, Scattering, Refractive index

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Proceedings Article | 29 January 2008 Paper

Tunable optical properties of photonic crystals and semiconductor microdisks using liquid crystals

Karoline Piegdon, Heinrich Matthias, Cedrik Meier, Heinz-S. Kitzerow

Proceedings Volume 6911, 69110J (2008) https://doi.org/10.1117/12.774194

KEYWORDS: Liquid crystals, Photonic crystals, Semiconductors, Gallium arsenide, Refractive index, Etching, Dielectrics, Quantum dots, Optical microcavities, Silicon

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Proceedings Article | 8 February 2007 Paper

Optoelectronic and photonic properties of liquid crystals: electroluminescence and photorefractivity

Stephan Benning, Marcus Lauhof, Lutz Paelke, Andreas Redler, Felix Scheliga, Emma Thorn-Csanyi, Volkmar Vill, Heinz-S. Kitzerow

Proceedings Volume 6487, 648702 (2007) https://doi.org/10.1117/12.716598

KEYWORDS: Liquid crystals, Luminescence, Electroluminescence, Polymers, Organic light emitting diodes, Crystals, Liquids, Organic semiconductors, Organic electronics, Diffraction

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Proceedings Article | 13 September 2005 Paper

Director fields of nematic liquid crystals in tunable photonic crystals

Heinz-Siegfried Kitzerow, Guido Mertens, Heinrich Matthias, Heinrich Marsmann, Ralf Wehrspohn, Sven Matthias, Ulrich Goesele, Stefan Frey, Helmut Foell

Proceedings Volume 5926, 592605 (2005) https://doi.org/10.1117/12.616456

KEYWORDS: Liquid crystals, Silicon, Photonic crystals, Refractive index, Modulation, Liquid crystal on silicon, Semiconducting wafers, Solids, Infrared radiation, Optical microcavities

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Proceedings Article | 30 April 2003 Paper

Electroluminescence and photovoltaic effects using columnar mesogenic compounds

Thomas Hassheider, Stephan Benning, Marcus Lauhof, Reinhold Oesterhaus, Sonia Alibert-Fouet, Harald Bock, John Goodby, Mark Watson, Klaus Muellen, Heinz-Siegfried Kitzerow

Proceedings Volume 5003, (2003) https://doi.org/10.1117/12.473864

KEYWORDS: Electroluminescence, Chromium, Aluminum, Liquid crystals, Luminescence, Photovoltaics, Telescopic pixel displays, Organic light emitting diodes, Molecules, Solids

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Proceedings Article | 11 March 1996 Paper

Polymer-dispersed liquid crystals: holographic formation of switchable gratings

Heinz Kitzerow, J. Strauss, Sukhmal Jain

Proceedings Volume 2651, (1996) https://doi.org/10.1117/12.235340

KEYWORDS: Liquid crystals, Diffraction gratings, Polymers, Diffraction, Modulation, Holography, Polymer thin films, Diffusion, Refractive index, Absorption

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Proceedings Article | 4 April 1994 Paper

Polymer-dispersed cholesteric liquid crystals

Peter Crooker, H.-S. Kitzerow, F. Xu

Proceedings Volume 2175, (1994) https://doi.org/10.1117/12.172123

KEYWORDS: LCDs, Liquid crystals, Polymers, Reflectivity, Ultraviolet radiation, Dielectrics, Anisotropy, Light scattering, Reflection, Reflective displays

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Showing 5 of 11 publications

Conference Committee Involvement (19)

Emerging Liquid Crystal Technologies XX

25 January 2025 | San Francisco, California, United States

Liquid Crystals Optics and Photonic Devices

8 April 2024 | Strasbourg, France

Emerging Liquid Crystal Technologies XIX

30 January 2024 | San Francisco, California, United States

Emerging Liquid Crystal Technologies XVIII

1 February 2023 | San Francisco, California, United States

Emerging Liquid Crystal Technologies XVII

25 January 2022 | San Francisco, California, United States

Emerging Liquid Crystal Technologies XVI

6 March 2021 | Online Only, California, United States

Emerging Liquid Crystal Technologies XV

3 February 2020 | San Francisco, California, United States

Emerging Liquid Crystal Technologies XIV

3 February 2019 | San Francisco, California, United States

Emerging Liquid Crystal Technologies XIII

29 January 2018 | San Francisco, California, United States

Emerging Liquid Crystal Technologies XII

31 January 2017 | San Francisco, California, United States

Emerging Liquid Crystal Technologies XI

16 February 2016 | San Francisco, California, United States

Emerging Liquid Crystal Technologies X

9 February 2015 | San Francisco, California, United States

Emerging Liquid Crystal Technologies IX

5 February 2014 | San Francisco, California, United States

Emerging Liquid Crystal Technologies VIII

5 February 2013 | San Francisco, California, United States

Emerging Liquid Crystal Technologies VII

22 January 2012 | San Francisco, California, United States

Emerging Liquid Crystal Technologies VI

25 January 2011 | San Francisco, California, United States

Emerging Liquid Crystal Technologies V

25 January 2010 | San Francisco, California, United States

Emerging Liquid Crystal Technologies IV

25 January 2009 | San Jose, California, United States

Emerging Liquid Crystal Technologies III

20 January 2008 | San Jose, California, United States

Showing 5 of 19 Conference Committees

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