New optical storage mode in liquid crystals

Haas, W.; Adams, James E.

doi:10.1063/1.1655299

Cited by 56 publications

(17 citation statements)

References 8 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: 90%

“…They have potential uses for applications in all-optical light manipulation in diffractive optics, telecommunication, optoelectronics, optical computer integrated systems, tunable dispersion materials, tunable gratings in multiplex system, adaptive optics, all-optical information displays, optical data storage, and other all-optical photonic devices. Laser control of cholesteric structures can be extended to other stable and metastable structures such as cholesteric fingers, Torons of other types, cholesteric bubbles, umbilical and other textures [12][13][14][27][28][29][30][31][32][33].…”

Section: Resultsmentioning

confidence: 99%

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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: 90%

Section: Resultsmentioning

confidence: 99%

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 have found that some of the studied laser-generated structures can also be obtained spontaneously when cooling the samples from the isotropic phase (although less reliably and without the control of spatial locations) and after applying low-frequency (10 Hz) electric fields to induce hydrodynamic instability. These localized structures, along with torons and hopfions, are several members of the large family of so-called cholesteric bubbles that were typically studied when occurring spontaneously, but not well understood in past experimental works [20,[34][35][36][37][38][39][40][41][42][43][44]. We note that the study of axially symmetric cholesteric configurations reported here is not exhaustive.…”

Section: Nested Axially Symmetric Structures Of Multiple Torons Anmentioning

confidence: 87%

“…We note that the study of axially symmetric cholesteric configurations reported here is not exhaustive. In fact, several other configurations might have been already identified in prior literature [20,[23][24][25][26][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48] that we have not explored so far using our 3D imaging experiments and different types of generation (laser realignment, low-frequency electric field, temperature quench with and without temperature gradients). In addition, in future work, studies of mutually linked multi-toron and multihopfion configurations that also belong to this family will be reported [51].…”

Section: Nested Axially Symmetric Structures Of Multiple Torons Anmentioning

confidence: 99%

Two-dimensional skyrmions and other solitonic structures in confinement-frustrated chiral nematics

et al. 2014

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We explore spatially localized solitonic configurations of a director field, generated using optical realignment and laser-induced heating, in frustrated chiral nematic liquid crystals confined between substrates with perpendicular surface anchoring. We demonstrate that, in addition to recently studied torons and Hopf-fibration solitonic structures (hopfions), one can generate a host of other axially symmetric stable and metastable director field configurations where local twist is matched to the surface boundary conditions through introduction of point defects and loops of singular and nonsingular disclinations. The experimentally demonstrated structures include the so-called "baby-skyrmions" in the form of double twist cylinders oriented perpendicular to the confining substrates where their double twist field configuration is matched to the perpendicular boundary conditions by loops of twist disclinations. We also generate complex textures with arbitrarily large skyrmion numbers. A simple back-of-the-envelope theoretical analysis based on free energy considerations and the nonpolar nature of chiral nematics provides insights into the long-term stability and diversity of these inter-related solitonic field configurations, including different types of torons, cholestric-finger loops, two-dimensional skyrmions, and more complex structures comprised of torons, hopfions, and various disclination loops that are experimentally observed in a confinement-frustrated chiral nematic system.

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“…(8). We start by dividing the region 0 5 r, 5 1 and 0 5 z, 1 into N x N cells as shown in Figure 7, where N is an even integer.…”

Section: Appendixmentioning

confidence: 99%

Molecular Alignment of Bubble Domains in Large Pitch Cholesteric Liquid Crystals

Ariga

Tako

1977

Molecular Crystals and Liquid Crystals

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Based on the naive model, the molecular alignment of the bubble domain in large pitch cholesterics is calculated numerically by using the continuum theory of liquid crystals. It is shown that the bubble domain is surely stable under certain conditions but when the cell thickness is thinner than the critical thickness homeotropic alignment is more favourable. The effects of the electric field on the bubble diameter are also investigated. Obtained results agree well qualitatively with the experimental results.

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New optical storage mode in liquid crystals

Cited by 56 publications

References 8 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

Two-dimensional skyrmions and other solitonic structures in confinement-frustrated chiral nematics

Molecular Alignment of Bubble Domains in Large Pitch Cholesteric Liquid Crystals

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