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3 August 2021 Tunable reflective colors in holographically patterned liquid crystal gels
Kyung Min Lee, Timothy J. Bunning, Timothy J. White, Michael E. McConney, Nicholas P. Godman
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Proceedings Volume 11807, Liquid Crystals XXV; 1180705 (2021) https://doi.org/10.1117/12.2593997
Event: SPIE Organic Photonics + Electronics, 2021, San Diego, California, United States
Abstract
Thin film holographic liquid crystal gratings are of great interest due to their controllable photonic properties. Holographic polymer dispersed liquid crystal (H-PDLC) with a polymer concentration of 40-90% is an example of a system where nonuniform irradiation is used to template alternating polymer-rich and polymer-poor regions with a periodicity related to the illumination wavelength. Here, we present a tunable holographic polymer stabilized liquid crystal (H-PSLC) reflection grating using a relatively small amount of polymer (6-20 wt%). Switching behavior from transparent to reflective state will be discussed by heating or applying an AC field. Heating above the isotropic temperature of the polymer-poor regions leads to the refractive index mismatch between the ordered LC polymer-rich regions and the disordered isotropic polymer-poor. Alternatively, the application of an AC field can be used as an Ohmic heat source to induce the thermal color change.
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Kyung Min Lee, Timothy J. Bunning, Timothy J. White, Michael E. McConney, and Nicholas P. Godman "Tunable reflective colors in holographically patterned liquid crystal gels", Proc. SPIE 11807, Liquid Crystals XXV, 1180705 (3 August 2021); https://doi.org/10.1117/12.2593997
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KEYWORDS
Polymers
Liquid crystals
Holography
Reflectivity
Photorefractive polymers
Reflection
Refractive index
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