Bubble Domain in Cholesteric Liquid Crystals

Kerllenevich, B.; Coche, A.

doi:10.1080/00268948108073552

Cited by 18 publications

(14 citation statements)

References 6 publications

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“…2) [14]. Such structures can spontaneously occur in CLCs confined into homeotropic cells, similar to the so-called cholesteric fingers and cholesteric bubbles [12,13,[27][28][29][30][31][32][33]. In the reconstructed director field configuration (Fig.…”

Section: Resultsmentioning

confidence: 89%

Optically generated reconfigurable photonic structures of elastic quasiparticles in frustrated cholesteric liquid crystals

Smalyukh¹,

Kaputa²,

Kachynski³

et al. 2012

Opt. Express

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We describe laser-induced two-dimensional periodic photonic structures formed by localized particle-like excitations in an untwisted confined cholesteric liquid crystal. The individual particle-like excitations (dubbed "Torons") contain three-dimensional twist of the liquid crystal director matched to the uniform background director field by topological point defects. Using both single-beam-steering and holographic pattern generation approaches, the periodic crystal lattices are tailored by tuning their periodicity, reorienting their crystallographic axes, and introducing defects. Moreover, these lattices can be dynamically reconfigurable: generated, modified, erased and then recreated, depending on the needs of a particular photonic application. This robust control is performed by tightly focused laser beams of power 10-100 mW and by low-frequency electric fields at voltages ~10 V applied to the transparent electrodes.

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Section: Resultsmentioning

confidence: 89%

Optically generated reconfigurable photonic structures of elastic quasiparticles in frustrated cholesteric liquid crystals

Smalyukh¹,

Kaputa²,

Kachynski³

et al. 2012

Opt. Express

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“…11 The helical structure of cholesteric LCs (CLCs) does not readily accommodate many confinement geometries. When CLCs are confined in slit cells with the cell gap close to cholesteric pitch, bubble domain defects are often observed under thermal quenching, 12 external electric field, [13][14][15][16][17][18] or illuminations of focused laser beams. [19][20][21][22][23] By microscopically reconstructing the director fields, Smalyukh and coworkers showed that the bubble domain defects are made of either torons or baby Skyrmions (2D Skyrmions).…”

Section: Introductionmentioning

confidence: 99%

Cholesteric liquid crystals in rectangular microchannels: skyrmions and stripes

et al. 2016

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In this paper, we present experimental and numerical studies on the microstructures of a cholesteric liquid crystal (CLC) confined in rectangular micron-channels. By using a sequence of microfabrication techniques we fabricated the micro-sized channels with accurately controlled size, aspect ratio and homeotropic surface anchoring. Through optical microscopic studies we established a phase diagram for the liquid crystal defect textures as a function of the channel depth and width. For the channel width larger than ∼2 times the cholesteric pitch p, the LC molecules are oriented primarily vertical to the channel when the channel depth is below 0.75p, form bubble domain defects when the channel depth is around 0.75p, and form stripe textures when the cell depth is above the cholesteric pitch p. In addition, the bubble domain size and the stripe texture periodicity are found to grow with the increase of the channel width. For the channel width smaller than ∼2p and the channel depth between 0.6p to 1.1p, no textures can be observed in the channels. Numerical simulations based on a director tensor relaxation approach yield detailed molecular director fields, and show that the bubble domain defects are baby-skyrmions and that the stripes are the first type of cholesteric fingerprints. A comparison with previous experiments and numerical simulations indicates that the size of the microchannels also influences what type of soliton-like topological textures form in the CLCs confined in the channels.

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“…In addition, the focal length was slightly reduced at high voltages, close to 2.4, due to the fact that the bubbles changed shape. 31 Further increase of the voltage (greater than 2.4 V) destroyed the CNLC lenses. The reported electrical tunability has been observed in cells with 60 lm thickness, but similar results can be obtained for bubbles with different diameters in cells of different thicknesses in the range shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Liquid crystal bubbles forming a tunable micro-lenses array

Hamdi

Petriashvili

Lombardo

et al. 2011

Journal of Applied Physics

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Cholesteric liquid crystals with long pitch confined in homeotropic cells can be used to generate stable but distorted and localized liquid crystal structures exhibiting spherulitic textures, known as “bubbles.” As these bubbles can be induced by an external electric field with a narrow range following the confinement ratio C=d/p ≈1 (d representing cell thickness and p representing cholesteric pitch), it is possible to obtain electrically controlled micro-lenses. Here we investigated the optical and electro-optical properties of such liquid crystal bubbles for creating an array of micro-lenses with electrically tunable focal length.

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Bubble Domain in Cholesteric Liquid Crystals

Cited by 18 publications

References 6 publications

Optically generated reconfigurable photonic structures of elastic quasiparticles in frustrated cholesteric liquid crystals

Optically generated reconfigurable photonic structures of elastic quasiparticles in frustrated cholesteric liquid crystals

Cholesteric liquid crystals in rectangular microchannels: skyrmions and stripes

Liquid crystal bubbles forming a tunable micro-lenses array

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