Higher–Order Bragg Reflection Colors in Polymer–Stabilized Cholesteric Liquid Crystals

The dynamic electro‐optic (EO) response of polymer‐stabilized cholesteric liquid crystals prepared using unpolarized UV light (U–PSCLC), such as reflection bandwidth broadening and either red or blue tuning of the reflection peak, has been previously reported. Herein, recent efforts to use a polariz...

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Autores principales:	Kyung Min Lee, Victor Yu Reshetnyak, Michael E. McConney, Ecklin P. Crenshaw, Timothy J. Bunning, Timothy J. White, Nicholas P. Godman
Formato:	article
Lenguaje:	EN
Publicado:	Wiley-VCH 2021
Materias:	cholesteric liquid crystals deformed cholesteric helix higher order Bragg reflections polymer stabilization Applied optics. Photonics TA1501-1820 Optics. Light QC350-467
Acceso en línea:	https://doaj.org/article/3ca4ea3e88e2431d99504cb1538ca3fe
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spelling	oai:doaj.org-article:3ca4ea3e88e2431d99504cb1538ca3fe2021-11-04T09:00:27ZHigher–Order Bragg Reflection Colors in Polymer–Stabilized Cholesteric Liquid Crystals2699-929310.1002/adpr.202100112https://doaj.org/article/3ca4ea3e88e2431d99504cb1538ca3fe2021-11-01T00:00:00Zhttps://doi.org/10.1002/adpr.202100112https://doaj.org/toc/2699-9293The dynamic electro‐optic (EO) response of polymer‐stabilized cholesteric liquid crystals prepared using unpolarized UV light (U–PSCLC), such as reflection bandwidth broadening and either red or blue tuning of the reflection peak, has been previously reported. Herein, recent efforts to use a polarized single argon‐ion laser beam to create PSCLCs (L–PSCLCs) with higher‐order reflections are described. The L–PSCLCs exhibit a primary reflection peak in the near‐infrared (NIR) regime and a second‐order reflection band with a narrow bandwidth in the visible regime that results from a deformed in‐plane CLC helical structure. The initial positions of the reflection bands are adjusted by the chiral dopant concentrations of the CLC mixture, and red, green, and blue reflection colors from the second‐order Bragg reflection are demonstrated. The primary and the second‐order reflection bands can be shifted to longer wavelengths by application of a DC electric field. The reflection efficiency of the higher‐order reflection notch increases with polymer concentration, which affects the degree of in‐plane deformation and fixation of the CLC helix. Modeling is used to further explain the formation of the higher‐order reflection bands of PSCLCs observed experimentally.Kyung Min LeeVictor Yu ReshetnyakMichael E. McConneyEcklin P. CrenshawTimothy J. BunningTimothy J. WhiteNicholas P. GodmanWiley-VCHarticlecholesteric liquid crystalsdeformed cholesteric helixhigher order Bragg reflectionspolymer stabilizationApplied optics. PhotonicsTA1501-1820Optics. LightQC350-467ENAdvanced Photonics Research, Vol 2, Iss 11, Pp n/a-n/a (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	cholesteric liquid crystals deformed cholesteric helix higher order Bragg reflections polymer stabilization Applied optics. Photonics TA1501-1820 Optics. Light QC350-467
spellingShingle	cholesteric liquid crystals deformed cholesteric helix higher order Bragg reflections polymer stabilization Applied optics. Photonics TA1501-1820 Optics. Light QC350-467 Kyung Min Lee Victor Yu Reshetnyak Michael E. McConney Ecklin P. Crenshaw Timothy J. Bunning Timothy J. White Nicholas P. Godman Higher–Order Bragg Reflection Colors in Polymer–Stabilized Cholesteric Liquid Crystals
description	The dynamic electro‐optic (EO) response of polymer‐stabilized cholesteric liquid crystals prepared using unpolarized UV light (U–PSCLC), such as reflection bandwidth broadening and either red or blue tuning of the reflection peak, has been previously reported. Herein, recent efforts to use a polarized single argon‐ion laser beam to create PSCLCs (L–PSCLCs) with higher‐order reflections are described. The L–PSCLCs exhibit a primary reflection peak in the near‐infrared (NIR) regime and a second‐order reflection band with a narrow bandwidth in the visible regime that results from a deformed in‐plane CLC helical structure. The initial positions of the reflection bands are adjusted by the chiral dopant concentrations of the CLC mixture, and red, green, and blue reflection colors from the second‐order Bragg reflection are demonstrated. The primary and the second‐order reflection bands can be shifted to longer wavelengths by application of a DC electric field. The reflection efficiency of the higher‐order reflection notch increases with polymer concentration, which affects the degree of in‐plane deformation and fixation of the CLC helix. Modeling is used to further explain the formation of the higher‐order reflection bands of PSCLCs observed experimentally.
format	article
author	Kyung Min Lee Victor Yu Reshetnyak Michael E. McConney Ecklin P. Crenshaw Timothy J. Bunning Timothy J. White Nicholas P. Godman
author_facet	Kyung Min Lee Victor Yu Reshetnyak Michael E. McConney Ecklin P. Crenshaw Timothy J. Bunning Timothy J. White Nicholas P. Godman
author_sort	Kyung Min Lee
title	Higher–Order Bragg Reflection Colors in Polymer–Stabilized Cholesteric Liquid Crystals
title_short	Higher–Order Bragg Reflection Colors in Polymer–Stabilized Cholesteric Liquid Crystals
title_full	Higher–Order Bragg Reflection Colors in Polymer–Stabilized Cholesteric Liquid Crystals
title_fullStr	Higher–Order Bragg Reflection Colors in Polymer–Stabilized Cholesteric Liquid Crystals
title_full_unstemmed	Higher–Order Bragg Reflection Colors in Polymer–Stabilized Cholesteric Liquid Crystals
title_sort	higher–order bragg reflection colors in polymer–stabilized cholesteric liquid crystals
publisher	Wiley-VCH
publishDate	2021
url	https://doaj.org/article/3ca4ea3e88e2431d99504cb1538ca3fe
work_keys_str_mv	AT kyungminlee higherorderbraggreflectioncolorsinpolymerstabilizedcholestericliquidcrystals AT victoryureshetnyak higherorderbraggreflectioncolorsinpolymerstabilizedcholestericliquidcrystals AT michaelemcconney higherorderbraggreflectioncolorsinpolymerstabilizedcholestericliquidcrystals AT ecklinpcrenshaw higherorderbraggreflectioncolorsinpolymerstabilizedcholestericliquidcrystals AT timothyjbunning higherorderbraggreflectioncolorsinpolymerstabilizedcholestericliquidcrystals AT timothyjwhite higherorderbraggreflectioncolorsinpolymerstabilizedcholestericliquidcrystals AT nicholaspgodman higherorderbraggreflectioncolorsinpolymerstabilizedcholestericliquidcrystals
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Higher–Order Bragg Reflection Colors in Polymer–Stabilized Cholesteric Liquid Crystals

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