Liquid Crystal Dispersions

Drzaic, Paul

doi:10.1142/2337

Cited by 955 publications

(594 citation statements)

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“…If the pitch, p, is on the order of visible light wavelengths, the selective reflection gives these short-pitch CLCs striking iridescent colours. While liquid crystals were studied in spherical shape very soon after their discovery [2], with a number of seminal works published also in the 1970s-1990s [3][4][5][6][7][8][9][10], not least in connection to polymer-dispersed liquid crystals [11], the success of liquid crystals in the flat panel display industry has for a quite long time set a paradigm in which liquid crystals are studied primarily in a flat sample geometry. This is today changing and curved geometries like droplets, cylinders or shells are now drawing more attention [12,13] (and references therein), due to the many interesting effects arising from confinement within one (droplet) or two (shell) self-closing surfaces.…”

Section: Introductionmentioning

confidence: 99%

Elucidating the fine details of cholesteric liquid crystal shell reflection patterns

et al. 2017

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Clusters of planar-aligned short-pitch cholesteric liquid crystal spheres generate dynamic colourful patterns due to multiple selective reflections from the radially oriented cholesteric helices in neighbour shells at varying distances. These photonic communication patterns were widely investigated for the cases of both droplets and shells, demonstrating not only intriguing optical phenomena but also potential for applications as new optical elements for photonics, sensing or security pattern generation. However, the optics of these clusters is truly complex and until now only the strongest and most fundamental reflections have been analysed and explained. In this report, we elucidate the origin of a number of more subtle reflections and we explain the extension in space of various spots as well as their internal colour variations. ARTICLE HISTORY

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Section: Introductionmentioning

confidence: 99%

Elucidating the fine details of cholesteric liquid crystal shell reflection patterns

et al. 2017

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“…Polymer dispersed liquid crystal (PDLC) films consist of randomly distributed micrometer-sized liquid crystal (LC) droplets embedded in an isotropic polymer matrix, and have attracted considerable interest for both technological and for more fundamental reasons [1,2,3,4].…”

Section: Introductionmentioning

confidence: 99%

Ordering of droplets and light scattering in polymer dispersed liquid crystal films

Kiselev

Yaroshchuk

Dolgov

2004

J. Phys.: Condens. Matter

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We study the effects of droplet ordering in initial optical transmittance through polymer dispersed liquid crystal (PDLC) films prepared in the presence of an electrical field. The experimental data are interpreted by using a theoretical approach to light scattering in PDLC films that explicitly relates optical transmittance and the order parameters characterizing both the orientational structures inside bipolar droplets and orientational distribution of the droplets. The theory relies on the Rayleigh-Gans approximation and uses the Percus-Yevick approximation to take into account the effects due to droplet positional correlations.

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“…Introduction. Due to their attractive electro-optical (EO) properties, the polymer-dispersed liquid crystal (PDLC) composite films [ 1 ] are currently applied as smart EO materials in switchable glasses [ 2,3 ], for displays [ 4 ] and devices for active control of light [ 5,6 ]. Single-layered PDLC films consisting of large microdroplets of liquid crystal (LC) disposed in an optically-transparent polymer matrix have also found advanced EO applications [7][8][9][10].…”

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confidence: 99%

“…In the low-frequency region, the decrease of the modulation amplitude with the decrease of the frequency is ascribed to another known effect -the ion screening of the applied electric field due to domination of free ion conductivity. The operation of PDLC devices is achieved by switching between their translucent and transparent states under the application of an external AC electric field [ 1 ]. The electric field re-orients the director in the droplets in the field direction (due to the positive dielectric anisotropy of E7), changing the optical properties of the PDLC composite film.…”

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Selective Amplitude-frequency Electro-optical Modulation by Polymer-dispersed Liquid Crystal Films Aligned by Teflon Nanolayers

Marinov¹,

Hadjichristov²,

Петров

et al. 2013

Proceeding BAS

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We report the amplitude-frequency electro-optical (EO) modulation by a specific type of polymer-dispersed liquid crystal (PDLC) composites -planar single layers of large nematic microdroplets aligned by teflon nanolayers. Such a surface modifying PDLC system exhibits a selective modulated 2nd harmonic EO response by the dielectric oscillations of the nematic director. The bandlike behavioural characteristic of the amplitude-frequency modulation of light, achieved by the single-layered PDLC films, can be tuned by AC voltage applied on the PDLC cell. This property can be applied to tunable EO modulators operating in the infrasound frequency range.

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Liquid Crystal Dispersions

Cited by 955 publications

References 0 publications

Elucidating the fine details of cholesteric liquid crystal shell reflection patterns

Elucidating the fine details of cholesteric liquid crystal shell reflection patterns

Ordering of droplets and light scattering in polymer dispersed liquid crystal films

Selective Amplitude-frequency Electro-optical Modulation by Polymer-dispersed Liquid Crystal Films Aligned by Teflon Nanolayers

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