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4 March 2019 Tunable holographic gratings based on cross-linked liquid-crystalline polymers in nematic liquid crystals (Conference Presentation)
Kyung Min Lee, Vincent P. Tondiglia, Timothy J. Bunning, Timothy J. White, Michael E. McConney
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Proceedings Volume 10944, Practical Holography XXXIII: Displays, Materials, and Applications; 1094406 (2019) https://doi.org/10.1117/12.2510438
Event: SPIE OPTO, 2019, San Francisco, California, United States
Abstract
Holographic reflection gratings formed by photopolymerization of low concentrations of liquid crystal monomers in nematic liquids demonstrate greater than 150nm of red tuning when a direct current (DC) field is applied across standard liquid crystal cell. The band position is restored when the field is removed. Diffraction efficiencies are both polarization and temperature polarization dependent. Samples are prepared using various LC mixtures, formulated from 2wt% photoinitiator, 5~20 wt% liquid crystal monomers and positive dielectric anisotropy liquid crystals. The basic tuning mechanism will be discussed, along with electric field, temperature effects on the optical performance.
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Kyung Min Lee, Vincent P. Tondiglia, Timothy J. Bunning, Timothy J. White, and Michael E. McConney "Tunable holographic gratings based on cross-linked liquid-crystalline polymers in nematic liquid crystals (Conference Presentation)", Proc. SPIE 10944, Practical Holography XXXIII: Displays, Materials, and Applications, 1094406 (4 March 2019); https://doi.org/10.1117/12.2510438
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KEYWORDS
Liquid crystals
Holography
Polymers
Dielectric polarization
Anisotropy
Dielectrics
Diffraction
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