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Fast polarization insensitive optical shutters using dual frequency liquid crystals

Glenn Mangelinckx UGent, Jeroen Beeckman UGent, Kristiaan Neyts UGent, Olga Chojnowska, Roman Dabrowski, J Shin and JDK Kim (2014) International Liquid Crystal Conference, Abstracts.
abstract
Most of the existing displays and optical shutters based on liquid crystals work in combination with linear polarizers. This implies that often more than half of the light is lost due to optical loss in the polarizers and/or the fact that the incoming light is unpolarized. For a number of shutter and filter applications it is important to have a high transmission, while it is not necessary to have a very high contrast. When considering nematic liquid crystals for use in fast optical shutters or filters, a number of possibilities exist. Dual-frequency liquid crystals offer faster switching possibilities because they can be switched from one state to another with a low frequency voltage and switching back can be achieved with the aid of a high frequency voltage. One of the limiting factors for the switching speed of dual-frequency nematics is the appearance of backflow. As in vertically aligned nematic devices, a certain threshold voltage exists above which the switching speed increases drastically [1]. Above the backflow threshold, the liquid crystal ends up in a meta-stable twisted orientation as shown in the figure below.
Please use this url to cite or link to this publication:
author
organization
year
type
conference
publication status
published
subject
in
International Liquid Crystal Conference, Abstracts
publisher
International liquid crystal society
place of publication
Dublin, Ireland
conference name
International Liquid Crystal Conference
conference location
Dublin, Ireland
conference start
2014-06-30
conference end
2014-07-04
language
English
UGent publication?
yes
classification
C3
copyright statement
I have retained and own the full copyright for this publication
id
5893551
handle
http://hdl.handle.net/1854/LU-5893551
date created
2015-03-11 17:10:09
date last changed
2017-01-02 09:53:20
@inproceedings{5893551,
  abstract     = {Most of the existing displays and optical shutters based on liquid crystals work in combination with linear polarizers. This implies that often more than half of the light is lost due to optical loss in the polarizers and/or the fact that the incoming light is unpolarized. For a number of shutter and filter applications it is important to have a high transmission, while it is not necessary to have a very high contrast. When considering nematic liquid crystals for use in fast optical shutters or filters, a number of possibilities exist. Dual-frequency liquid crystals offer faster switching possibilities because they can be switched from one state to another with a low frequency voltage and switching back can be achieved with the aid of a high frequency voltage. One of the limiting factors for the switching speed of dual-frequency nematics is the appearance of backflow. As in vertically aligned nematic devices, a certain threshold voltage exists above which the switching speed increases drastically [1]. Above the backflow threshold, the liquid crystal ends up in a meta-stable twisted orientation as shown in the figure below.},
  author       = {Mangelinckx, Glenn and Beeckman, Jeroen and Neyts, Kristiaan and Chojnowska, Olga and Dabrowski, Roman and Shin, J and Kim, JDK},
  booktitle    = {International Liquid Crystal Conference, Abstracts},
  language     = {eng},
  location     = {Dublin, Ireland},
  publisher    = {International liquid crystal society},
  title        = {Fast polarization insensitive optical shutters using dual frequency liquid crystals},
  year         = {2014},
}

Chicago
Mangelinckx, Glenn, Jeroen Beeckman, Kristiaan Neyts, Olga Chojnowska, Roman Dabrowski, J Shin, and JDK Kim. 2014. “Fast Polarization Insensitive Optical Shutters Using Dual Frequency Liquid Crystals.” In International Liquid Crystal Conference, Abstracts. Dublin, Ireland: International liquid crystal society.
APA
Mangelinckx, G., Beeckman, J., Neyts, K., Chojnowska, O., Dabrowski, R., Shin, J., & Kim, J. (2014). Fast polarization insensitive optical shutters using dual frequency liquid crystals. International Liquid Crystal Conference, Abstracts. Presented at the International Liquid Crystal Conference, Dublin, Ireland: International liquid crystal society.
Vancouver
1.
Mangelinckx G, Beeckman J, Neyts K, Chojnowska O, Dabrowski R, Shin J, et al. Fast polarization insensitive optical shutters using dual frequency liquid crystals. International Liquid Crystal Conference, Abstracts. Dublin, Ireland: International liquid crystal society; 2014.
MLA
Mangelinckx, Glenn, Jeroen Beeckman, Kristiaan Neyts, et al. “Fast Polarization Insensitive Optical Shutters Using Dual Frequency Liquid Crystals.” International Liquid Crystal Conference, Abstracts. Dublin, Ireland: International liquid crystal society, 2014. Print.