Photorefractivity in polymer-stabilized nematic liquid crystals

Gary P. Wiederrecht, Michael R Wasielewski

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Polymer-stabilized liquid crystals, consisting of low concentrations of a polymeric electron acceptor, are shown to exhibit significantly enhanced photorefractive properties. The charge generation and transport of these composite systems are strongly modified from nematic liquid crystals doped with electron donors and acceptors. The new composites are produced by polymerizing a small quantity of a 1,4:5,8-naphthalenediimide electron acceptor functionalized with an acrylate group in an aligned nematic liquid crystal. Photopolymerization creates an anisotropic gel-like medium in which the liquid crystal is free to reorient in the presence of a space charge field, while maintaining charge trapping sites in the polymerized regions of the material. The presence of these trapping sites results in the observation of longer lived, higher resolution holographic gratings in the polymer-stabilized liquid crystals than observed in nematic liquid crystals alone. These gratings Bragg regime diffraction. Asymmetric beam coupling, photo-conductivity, and four-wave mixing experiments are performed to characterize the photophysics of these novel materials.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsS. Ducharme, J.W. Stasiak
Pages102-109
Number of pages8
Volume3471
DOIs
Publication statusPublished - 1998
EventXerographic Photoreceptors and Organic Photorefractic Materials IV - San Diego, CA, United States
Duration: Jul 22 1998Jul 23 1998

Other

OtherXerographic Photoreceptors and Organic Photorefractic Materials IV
CountryUnited States
CitySan Diego, CA
Period7/22/987/23/98

Fingerprint

photorefractivity
Nematic liquid crystals
Liquid crystals
liquid crystals
Electrons
polymers
Polymers
Holographic gratings
Charge trapping
Bragg gratings
Photopolymerization
Four wave mixing
Electric space charge
Large scale systems
Gels
Diffraction
trapping
electrons
composite materials
Composite materials

Keywords

  • Non-linear optics
  • Photoconductivity
  • Photorefractive materials
  • Polymer-stabilized liquid crystals

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Wiederrecht, G. P., & Wasielewski, M. R. (1998). Photorefractivity in polymer-stabilized nematic liquid crystals. In S. Ducharme, & J. W. Stasiak (Eds.), Proceedings of SPIE - The International Society for Optical Engineering (Vol. 3471, pp. 102-109) https://doi.org/10.1117/12.328153

Photorefractivity in polymer-stabilized nematic liquid crystals. / Wiederrecht, Gary P.; Wasielewski, Michael R.

Proceedings of SPIE - The International Society for Optical Engineering. ed. / S. Ducharme; J.W. Stasiak. Vol. 3471 1998. p. 102-109.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Wiederrecht, GP & Wasielewski, MR 1998, Photorefractivity in polymer-stabilized nematic liquid crystals. in S Ducharme & JW Stasiak (eds), Proceedings of SPIE - The International Society for Optical Engineering. vol. 3471, pp. 102-109, Xerographic Photoreceptors and Organic Photorefractic Materials IV, San Diego, CA, United States, 7/22/98. https://doi.org/10.1117/12.328153
Wiederrecht GP, Wasielewski MR. Photorefractivity in polymer-stabilized nematic liquid crystals. In Ducharme S, Stasiak JW, editors, Proceedings of SPIE - The International Society for Optical Engineering. Vol. 3471. 1998. p. 102-109 https://doi.org/10.1117/12.328153
Wiederrecht, Gary P. ; Wasielewski, Michael R. / Photorefractivity in polymer-stabilized nematic liquid crystals. Proceedings of SPIE - The International Society for Optical Engineering. editor / S. Ducharme ; J.W. Stasiak. Vol. 3471 1998. pp. 102-109
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