Electro-optic response in polymer stabilized cholesteric liquid crystals

Kyung Min Lee; Timothy J. White; Timothy J. Bunning; Michael E. McConney; Nicholas Godman

doi:10.1117/12.2578297

5 March 2021 Electro-optic response in polymer stabilized cholesteric liquid crystals

Kyung Min Lee, Timothy J. White, Timothy J. Bunning, Michael E. McConney, Nicholas Godman

Proceedings Volume 11707, Emerging Liquid Crystal Technologies XVI; 117070J (2021) https://doi.org/10.1117/12.2578297
Event: SPIE OPTO, 2021, Online Only

Abstract

Cholesteric liquid crystal (CLC) is a one-dimensional photonic crystal and is promising for various applications, including smart windows, optical components, and displays. Previous work has reported that polymer stabilized cholesteric liquid crystals (PSCLCs) have shown dynamic photonic properties with the application of direct current (DC) field, including bandwidth broadening, switchable scattering, red tuning and blue tuning. Recently, PSCLCs have been prepared upon exposure of a 363.8 nm Argon laser, and higher order diffraction peaks, such as the second and/or third order diffraction peaks, are observed. The higher order reflection bands are caused by the deformed helical structure of the polymer stabilizing network formed during the exposure of a single laser beam or under reflection grating conditions. The spectral position of the second-order reflection band, which is half the spectral position of the main CLC reflection band, is simply adjusted by chiral dopant concentrations in the CLC mixture. The selective main and higher order reflection notches can be red-tuned and broadened by the application of DC fields. A potential mechanism for higher order diffraction peaks in the PSCLCs will be discussed.

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Kyung Min Lee, Timothy J. White, Timothy J. Bunning, Michael E. McConney, and Nicholas Godman "Electro-optic response in polymer stabilized cholesteric liquid crystals", Proc. SPIE 11707, Emerging Liquid Crystal Technologies XVI, 117070J (5 March 2021); https://doi.org/10.1117/12.2578297

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KEYWORDS

Electro optic polymers

Liquid crystals

Polymers

Electro optics

Diffraction

Photonic crystals

Laser scattering

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