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Department of Chemistry
Liquid crystals
Prof. Dr. rer. nat. Heinz-Siegfried Kitzerow
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Research Topics:

Research Topics

Opto-optic / Photoresponsive Devices And Hybrid Materials

First results will be revealed, soon!

(optical manipulation / non-linear opts-optical responses)

 

 

Also: Towards advanced strategies for the enhancement of LC electro-optics via photo generated polymer 

Polymer Enhanced Nematic Liquid Crystals

Nematic liquid crystals can show continuous phase modulation properties and surprisingly fast response times (well below 2 ms) if doped with a tailored mixture of insitu generated copolymer. Mixture composition and curing conditions are challenging research topics with a potential to push smart windows technology, displays and also bistable devices. 

See: A. Lorenz, L. Braun, V. Kolosova, "Continuous Optical Phase Modulation in a Copolymer Network Nematic Liquid Crystal." ACS Photonics 3, 1188 (2016). pubs.acs.org/doi/abs/10.1021/acsphotonics.6b00072

 

 

Soft Responsive Materials With Induced Chirality

Fast electro-optic modulations with sub millisecond response times can be achieved in chiral nematic LCs (flexoelectro-optic responses) or blue phase LCs (Kerr-effect type responses). Here, chirality is usually induced in an otherwise non-chiral host LC. 

These advanced electro-optical materials have a huge potential to complement and even replace today's LC technologies. Anyway, many challenges still need to be addressed. Therefore, we have developed fitted experimental techniques to investigate their properties quantitatively, so we can go ahead and improve their properties!

One example, where we investigated how added polymer improved the response properties of hyper twisted chiral nematic LCs can be found here:

A. Lorenz, D. J. Gardiner, S. M. Morris, F. Castles, M. M. Qasim, S. S. Choi, W.-S. Kim, H. J. Coles, T. D. Wilkinson "Electrical addressing of polymer stabilized hyper-twisted chiral nematic liquid crystals with interdigitated electrodes: Experiment and model," Appl. Phys. Lett. 104, 071102 (2014). http://dx.doi.org/10.1063/1.4865558

Head

Dr. Alexander Lorenz

Physical Chemistry

Principal investigator, DFG grant 1922/4-1 'Photoactive LC Nanodispersions'

Alexander Lorenz
Phone:
+49 5251 60-5728
Fax:
+49 5251 60-4208
Office:
NW 1 872

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