Multifunctional Optical Device with a Continuous Tunability over 500 nm Spectral Range Using Polymerized Cholesteric Liquid Crystals

We report that polymerization makes a robust, practically applicable multifunctional optical device with a continuous wavelength tunable over 500 nm spectral range using UV-polymerizable cholesteric liquid crystals (CLCs). It can be used as a circular polarizer generating an extremely high degree of...

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Autores principales:	Mi-Yun Jeong, Hyeon-Jong Choi, Keumcheol Kwak, Younghun Yu
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	optical multifunctional device optical tunable filter liquid crystal filter device circular polarizer intensity-variable beam splitter Organic chemistry QD241-441
Acceso en línea:	https://doaj.org/article/f4f8291e333b45058e2a4c1ad3205c1e
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spelling	oai:doaj.org-article:f4f8291e333b45058e2a4c1ad3205c1e2021-11-11T18:45:07ZMultifunctional Optical Device with a Continuous Tunability over 500 nm Spectral Range Using Polymerized Cholesteric Liquid Crystals10.3390/polym132137202073-4360https://doaj.org/article/f4f8291e333b45058e2a4c1ad3205c1e2021-10-01T00:00:00Zhttps://www.mdpi.com/2073-4360/13/21/3720https://doaj.org/toc/2073-4360We report that polymerization makes a robust, practically applicable multifunctional optical device with a continuous wavelength tunable over 500 nm spectral range using UV-polymerizable cholesteric liquid crystals (CLCs). It can be used as a circular polarizer generating an extremely high degree of circularly polarized light with \|g\| = 1.85~2.00. It can also be used for optical notch filters, bandwidth-variable (from ~28 nm to ~93 nm) bandpass filters, mirrors, and intensity-variable beam splitters. Furthermore, this CLC device shows excellent stability owing to the polymerization of CLC cells. Its performance remains constant for a long time (~2 years) after a high-temperature exposure (170 °C for 1 h) and an extremely high laser beam intensity exposure (~143 W/cm<sup>2</sup> of CW 532 nm diode laser and ~2.98 MW/cm<sup>2</sup> of Nd: YAG pulse laser operation for two hours, respectively). The optical properties of polymerized CLC were theoretically analyzed by Berreman’s 4 × 4 matrix method. The characteristics of this device were significantly improved by introducing an anti-reflection layer on the device. This wavelength-tunable and multifunctional device could dramatically increase optical research efficiency in various spectroscopic works. It could be applied to many instruments using visible and near-infrared wavelengths.Mi-Yun JeongHyeon-Jong ChoiKeumcheol KwakYounghun YuMDPI AGarticleoptical multifunctional deviceoptical tunable filterliquid crystal filter devicecircular polarizerintensity-variable beam splitterOrganic chemistryQD241-441ENPolymers, Vol 13, Iss 3720, p 3720 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	optical multifunctional device optical tunable filter liquid crystal filter device circular polarizer intensity-variable beam splitter Organic chemistry QD241-441
spellingShingle	optical multifunctional device optical tunable filter liquid crystal filter device circular polarizer intensity-variable beam splitter Organic chemistry QD241-441 Mi-Yun Jeong Hyeon-Jong Choi Keumcheol Kwak Younghun Yu Multifunctional Optical Device with a Continuous Tunability over 500 nm Spectral Range Using Polymerized Cholesteric Liquid Crystals
description	We report that polymerization makes a robust, practically applicable multifunctional optical device with a continuous wavelength tunable over 500 nm spectral range using UV-polymerizable cholesteric liquid crystals (CLCs). It can be used as a circular polarizer generating an extremely high degree of circularly polarized light with \|g\| = 1.85~2.00. It can also be used for optical notch filters, bandwidth-variable (from ~28 nm to ~93 nm) bandpass filters, mirrors, and intensity-variable beam splitters. Furthermore, this CLC device shows excellent stability owing to the polymerization of CLC cells. Its performance remains constant for a long time (~2 years) after a high-temperature exposure (170 °C for 1 h) and an extremely high laser beam intensity exposure (~143 W/cm<sup>2</sup> of CW 532 nm diode laser and ~2.98 MW/cm<sup>2</sup> of Nd: YAG pulse laser operation for two hours, respectively). The optical properties of polymerized CLC were theoretically analyzed by Berreman’s 4 × 4 matrix method. The characteristics of this device were significantly improved by introducing an anti-reflection layer on the device. This wavelength-tunable and multifunctional device could dramatically increase optical research efficiency in various spectroscopic works. It could be applied to many instruments using visible and near-infrared wavelengths.
format	article
author	Mi-Yun Jeong Hyeon-Jong Choi Keumcheol Kwak Younghun Yu
author_facet	Mi-Yun Jeong Hyeon-Jong Choi Keumcheol Kwak Younghun Yu
author_sort	Mi-Yun Jeong
title	Multifunctional Optical Device with a Continuous Tunability over 500 nm Spectral Range Using Polymerized Cholesteric Liquid Crystals
title_short	Multifunctional Optical Device with a Continuous Tunability over 500 nm Spectral Range Using Polymerized Cholesteric Liquid Crystals
title_full	Multifunctional Optical Device with a Continuous Tunability over 500 nm Spectral Range Using Polymerized Cholesteric Liquid Crystals
title_fullStr	Multifunctional Optical Device with a Continuous Tunability over 500 nm Spectral Range Using Polymerized Cholesteric Liquid Crystals
title_full_unstemmed	Multifunctional Optical Device with a Continuous Tunability over 500 nm Spectral Range Using Polymerized Cholesteric Liquid Crystals
title_sort	multifunctional optical device with a continuous tunability over 500 nm spectral range using polymerized cholesteric liquid crystals
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/f4f8291e333b45058e2a4c1ad3205c1e
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Multifunctional Optical Device with a Continuous Tunability over 500 nm Spectral Range Using Polymerized Cholesteric Liquid Crystals

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