Bent core nematics as optical gratings

Éber, Nándor; Xiang, Ying; Buka, Ágnes

doi:10.1016/j.molliq.2017.09.025

Cited by 10 publications

(6 citation statements)

References 38 publications

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“…At 36 V, they observed the well-known Williams domains, a series of convective rows that yield a grating pattern and under monochromatic illumination results in a pattern of intensity maxima, from which the grating periodicity was calculated, matching the distances measured under polarized optical microscope (POM). [56,57] The diffraction patterns and the corresponding LC textures for several voltages are shown in Figure 5B. They also discovered that the diffraction occurs only if the light beam is polarized perpendicularly to the rubbing direction of the sample.…”

Section: Surface Template and Electric Field-driven Gratingsmentioning

confidence: 92%

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Dynamic Control of Light Direction Enabled by Stimuli‐Responsive Liquid Crystal Gratings

et al. 2018

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the duality consolidation, the idea of controlling light and how it interacts with matter has always been an exciting topic. Visible light, as we perceive it, is a small portion of the electromagnetic spectrum composed of mutually perpendicular oscillating electric and magnetic fields that propagate through space and presents wave-like and particle-like behavior. Since the elements comprising matter possess dynamic electron clouds, the electromagnetic nature of light prompts different responses when it interacts with different materials, depending on its intensity, frequency, the arrangement of molecules, and so on. Whenever light interacts with matter, it might be absorbed, re-emitted, scattered, or transmitted. Although these effects are well known, the combination of them with new, innovative materials pushes optics forward. In fact, advances in optics have often occurred through the development of materials with improved optical properties, thus creating remarkable applications that tremendously influence our daily lives. These exciting applications include image processing and recording, lasing, data storage, display devices, detector systems, propulsion systems, and optical tweezers, which have enabled remote micromanipulation of colloidal particles and promising applications in various biomedical and biological applications. [1][2][3] There is, however, one component that stands out: the diffraction grating. It is generally regarded as one of the most important devices in the development of several fields of science. [4] Such importance comes from the fact that a diffraction grating is a device with a periodic structure capable of changing the propagation and splitting the spectrum The ability to control light direction with tailored precision via facile means is long-desired in science and industry. With the advances in optics, a periodic structure called diffraction grating gains prominence and renders a more flexible control over light propagation when compared to prisms. Today, diffraction gratings are common components in wavelength division multiplexing devices, monochromators, lasers, spectrometers, media storage, beam steering, and many other applications. Next-generation optical devices, however, demand nonmechanical, full and remote control, besides generating higher than 1D diffraction patterns with as few optical elements as possible. Liquid crystals (LCs) are great candidates for light control since they can form various patterns under different stimuli, including periodic structures capable of behaving as diffraction gratings. The characteristics of such gratings depend on several physical properties of the LCs such as film thickness, periodicity, and molecular orientation, all resulting from the internal constraints of the sample, and all of these are easily controllable. In this review, the authors summarize the research and development on stimuli-controllable diffraction gratings and beam steering using LCs as the active optical materials. Dynamic gratings fabricated by applying external f...

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Section: Surface Template and Electric Field-driven Gratingsmentioning

confidence: 92%

“…[54,55] Recently, such flexodomains were shown to act as adjustable gratings that respond to an applied field. [56,57] The diffraction patterns and the corresponding LC textures for several voltages are shown in Figure 5B.…”

Section: Surface Template and Electric Field-driven Gratingsmentioning

confidence: 99%

Dynamic Control of Light Direction Enabled by Stimuli‐Responsive Liquid Crystal Gratings

et al. 2018

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“…Though, as we have seen above, 'banana-specificity' is not a unique property of a single specific compound, it is by far not general among BC nematics. For example, in the oxadiazole derivatives HBCN12-HBCN15 [42,51,52,48] and in the bent-rod dimers DBCN3 [68,69,70,71] and DBCN4 [72,73], neither the two kinds of PWs, nor high f patterns with negative slope of Uc(f) could be detected. Instead, the pattern morphologies observed resemble those found in calamitics.…”

Section: Electroconvection In Bcnsmentioning

confidence: 99%

“…Voltage dependence of the dimensionless wavenumber q* = q d/π of FDs in HBCN4. (After [33]) More detailed experimental studies in planar cells of HBCN13 have been reported in [45,47,48,50].…”

Section: Flexoelectric Domainsmentioning

confidence: 99%

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Electrically driven structures in bent-core nematics

2021

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This review, dedicated to the memory of B. K. Sadashiva, concerns electrically driven patterns and defects in bent core nematics (BCNs) made of hard-core, soft-core or bent-rod type of molecules. It covers (a) spatially periodic patterns associated with electroconvection and flexoelectric deformation, (b) dislocations in these patterned states and (c) various types of defects induced essentially in homogeneous, unpatterned states of BCNs. While in general, the wealth of pattern morphologies is just as rich in BCNs as in rod-like nematics, certain features of electroconvection have so far been observed only in some BCN materials. Some attributes relating to the generation and behaviour of defects in electric field may also be ascribed to material properties specific to BCNs. It is also shown that the electric field induced patterns as well as their modification by light irradiation may serve as optical gratings and thus establishes the background for designing new photonic devices.

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Introduction to the Special Issue of the Journal of Molecular Liquids Dedicated to the Memory of Professor Yuriy Reznikov

Garbovskiy

Glushchenko

2018

Journal of Molecular Liquids

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Bent core nematics as optical gratings

Cited by 10 publications

References 38 publications

Dynamic Control of Light Direction Enabled by Stimuli‐Responsive Liquid Crystal Gratings

Dynamic Control of Light Direction Enabled by Stimuli‐Responsive Liquid Crystal Gratings

Electrically driven structures in bent-core nematics

Introduction to the Special Issue of the Journal of Molecular Liquids Dedicated to the Memory of Professor Yuriy Reznikov

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