Polarization and switching properties of holographic polymer-dispersed liquid-crystal gratings II Experimental investigations

Sutherland, Richard L.; Natarajan, Lalgudi V.; Tondiglia, Vincent P.; Chandra, Suresh; Shepherd, Christina K.; Brandelik, Donna M.; Siwecki, Stephen A.; Bunning, Timothy J.

doi:10.1364/josab.19.003004

Cited by 64 publications

(27 citation statements)

References 16 publications

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“…The reason might be the following. First, polymer contained in LC-rich zones might be more than 20%; it might be over 30% or more in actual samples (37). Because of this, n LC-rich decreases and, simultaneously, refractive index modulation also decreases, which leads to the firstorder diffraction efficiency being smaller than theoretical results.…”

Section: Liquid Crystals 497mentioning

confidence: 87%

Single‐step exposure for two‐dimensional electrically‐tuneable diffraction grating based on polymer dispersed liquid crystal

et al. 2008

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The two-dimensional (2D) electrically tuneable grating exhibits a bright future in the fields of optics and communication. A 2D grating based on a polymer-dispersed liquid crystal (PDLC) with good electro-optical (E-O) properties was fabricated through a single-step exposure method. The E-O behaviour was measured and the morphology of the grating observed using polarising optical microscopy (POM) and atom force microscopy (AFM). In addition, a 2D diffraction model and photopolymerisation dynamics model are presented to evaluate the E-O properties and morphology of the grating. All results obtained from the model show good agreement with experimental data. These results indicate that the morphologies are fairly good when the intensity ratio of pair L and pair K, labelled in the experimental setup, was 1:1.

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Section: Liquid Crystals 497mentioning

confidence: 87%

Single‐step exposure for two‐dimensional electrically‐tuneable diffraction grating based on polymer dispersed liquid crystal

et al. 2008

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“…This system leads to submicrometer sized droplets provided a surfactant is added in order to improve phase separation. Electro-optical devices have been demonstrated [2,7] using this mixture. One of the main issues is reported by Sutherland et al [11] and concerns material ageing which seems to be caused by the surfactant.…”

Section: Fabricationmentioning

confidence: 99%

“…Some papers [1][2][3][4][5] have shown that PDLC with submicrometer sized droplets could be recorded using liquid crystal of the BL series (MERCK) and acrylate monomer. It has been shown in a previous paper [6] that PDLC of micrometer sized droplets could be realized also with thiol-ene monomer and liquid crystal of the BL serie.…”

Section: Introductionmentioning

confidence: 99%

Electro-optical response of thiol-ene based PDLC

Rachet¹,

Loiseaux²,

Barny³

et al. 2004

Molecular Crystals and Liquid Crystals

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PDLC with micrometer or submicrometer sized droplets have been demonstrated using acrylate syrup as polymer precursor. In this paper the ability of thiol-ene monomere to lead to such PDLC is investigated. Electro-optic response of bulk composite material is measured by an interferometric setup and compared to theoretical model. A morphological study has shown a specific response of submicrometer PDLC. UV laser (355 nm) has been used to record gratings. The weakness of diffractive efficiency seems to show an intrinsic limitation of nanosized PDLC for low spatial frequencies.

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“…Когда исходная компо-зиция, состоящая из светочувствительного мономера, фотоинициирующей системы и ЖК, облучается светом с равномерной интенсивностью, формируются традиционные полимерно-дис-персные ЖК. Если использовать методы оптической голографии и освещать исходную композицию светом интерференционной картины, являющейся результатом суперпозиции двух когерентных лазерных пучков, формируется периодическая надмолекулярная структура, определяющая оптические свойства сформиро-ванного композита [3][4][5][6][7][8].…”

Section: Introductionunclassified