Optically Controllable Linear-Polarization Rotator Using Chiral-Azobenzene-Doped Liquid Crystals

Liu, Cheng-Kai; Chiu, Chian Yu; Morris, Stephen M.; Tsai, Min Cheng; Chen, Chii Chang

doi:10.3390/ma10111299

Cited by 15 publications

(5 citation statements)

References 32 publications

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“…Однако использование сильного азимутального сцепления директора на подложках, хорошо зарекомендовавшее себя в электрооптических ЖК-ячейках, будет мешать такому изменению директора. Как следствие, в ЖКячейках с жестким азимутальным сцеплением изменение шага спирали хирального нематика будет происходить скачкообразно, что особенно ярко проявляется в ЖК-ячейках с шагом спирали, соизмеримым с толщиной d ЖК-слоя [8,9]. В данной работе представлены результаты исследования ЖК-системы с плавно изменяющимся под действием света шагом спирали хирального нематика и соответствующим плавным азимутальным поворотом директора на одной из подложек ЖК-ячейки.…”

Section: Introductionunclassified

Photoinduced Transformation of the Orientational Structure of a Chiral Nematic under Planar-Conical Anchoring

Abdullaev,

Krakhalev,

Zyryanov

2024

Liq. Cryst. and their Appl.

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The photo-induced change in the orientation structure of the chiral nematic based on LN-396 doped with chiral dopants S811 and cChD has been investigated. It is shown that the use of planar-conical boundary conditions makes it possible to realise a smooth variation of the structure twist angle by changing the helix pitch. It is shown that the twisting of the structure of the studied chiral nematic to an angle of more than 240° leads to undulations when the conical anchoring is specified by the PiBMA polymer. The PtBMA polymer, on the other hand, specifies tangential boundary conditions for the chiral nematic under study, allowing the director to rotate easily in the plane of the sample. The results presented may be promising for the development of liquid crystal systems with finely tunable polar and azimuthal angles of the director.

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Section: Introductionunclassified

Photoinduced Transformation of the Orientational Structure of a Chiral Nematic under Planar-Conical Anchoring

Abdullaev,

Krakhalev,

Zyryanov

2024

Liq. Cryst. and their Appl.

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“…LC displays that use this principle have dominated the display market [4][5][6]. LC materials can also be used as polarization rotators, which can precisely control the polarization axis of linearly-polarized light [7][8][9][10][11][12][13][14][15]. A tunable LC polarization rotator can rotate the polarization axis of the incident light by changing the orientation of the LC molecules.…”

Section: Introductionmentioning

confidence: 99%

“…The rotation of the polarization axis can be achieved by a combination of an LC wave plate and a quarter-wave plate (QWP) [3,[13][14][15]. By changing the retardation of the LC wave plate, the output polarization axis can be controlled.…”

Section: Introductionmentioning

confidence: 99%

Broadband tunable polarization rotator based on the waveguiding effect of liquid crystals

Choi¹,

Oh²,

Sohn³

et al. 2021

J. Phys. D: Appl. Phys.

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A tunable liquid crystal (LC) polarization rotator that can rotate the polarization axis of linearly-polarized broadband light is achieved by using an asymmetrically-anchored negative LC cell. Interdigitated electrodes are used to apply an in-plane field to control the twist angle. The use of the asymmetrical anchoring in the LC cell enables continuous change of the twist angle by increasing the applied electric field. For uniform transmission, we used an LC that has negative dielectric anisotropy to avoid tilting of LC molecules by the vertical component of the electric field. We theoretically and experimentally confirmed that the fabricated LC cell could continuously change the twist angle and rotate the polarization axis of the linearly-polarized broadband incident light.

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“…These unique properties enable to design a great variety of optical elements and devices based on CLC layers, films, or cells. Among them it is necessary to mention the media for photo‐optical data recording, electrically switchable mirrors, optically controllable linear‐polarization rotators, coatings with controllable friction and adhesion, materials for display technology, secure authentication, sensors on metal ions, volatile amines, pH, and many others …”

Section: Introductionmentioning

confidence: 99%

Cholesteric Liquid Crystal Materials for Tunable Diffractive Optics

Ryabchun

Bobrovsky

2018

Advanced Optical Materials

196

106

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refractive, diffraction and optical fiber components. In particular, diffraction grating (DG) is one of the key elements for the design and creation of modern optoelectronic devices. One of the most prominent materials for the creation of DGs is liquid crystals. The main feature of these systems is that liquid crystals combine properties such as optical anisotropy inherent for crystals and molecular mobility. High sensitivity to an external field, in particular to an electric field, makes liquid crystals very useful for the creation of DGs with tunable properties. The combination of these properties enables easy control of optical characteristics of such systems and opens wide perspectives for the design of new materials for diffractive optics.Among the different types of liquid crystalline (LC) phases, cholesteric liquid crystal (CLC) phase possesses intrinsic periodicity in the form of the helical supramolecular structure (Figure 1). With the realization of definite alignment conditions, this periodicity has been exploited for generation of DGs. [8,9] Another remarkable feature of the cholesteric mesophase is selective light reflection with the reflection wavelength determined by the simple Equation (1) where n is the average refractive index, and P is the helix pitch. The specific value of helix pitch depends on the chemical structure of the molecules forming the cholesteric phase and concentration of chiral moieties. One of the easiest ways to obtain the cholesteric mesophase is by doping the nematic matrix with chiral components (Figure 1). Variation of structure of chiral molecules by external stimuli leading, for examples, to the photoisomerization, is effectively used for fine tuning of the helix pitch. [10][11][12][13][14][15][16][17] In addition, the application of an electric field also provides a convenient opportunity to change optical properties of the CLC phase. [18][19][20][21] These unique properties enable to design a great variety of optical elements and devices based on CLC layers, films, or cells. Among them it is necessary to mention the media for photo-optical data recording, [22][23][24][25] electrically switchable mirrors, [26,27] optically controllable linearpolarization rotators, [28] coatings with controllable friction and adhesion, [29] materials for display technology, [23,30] secure Modern optics and photonics constantly require break-through materials and designs in order to achieve miniature, lightweight, highly tunable, and effective optical devices. One of the basic optical components is the diffraction grating (DG), widely used for the dispersion of light, beam steering, etc. This review gathers research efforts on diffractive optical elements based on cholesteric liquid crystal (CLC) materials with a supramolecular helical architecture. All main types and fabrication approaches of periodic diffractive structures from CLCs are classified and described. Key optical properties of DGs, their advantages and drawbacks are considered. Special attention is paid on the tunability of DG...

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Optically Controllable Linear-Polarization Rotator Using Chiral-Azobenzene-Doped Liquid Crystals

Cited by 15 publications

References 32 publications

Photoinduced Transformation of the Orientational Structure of a Chiral Nematic under Planar-Conical Anchoring

Photoinduced Transformation of the Orientational Structure of a Chiral Nematic under Planar-Conical Anchoring

Broadband tunable polarization rotator based on the waveguiding effect of liquid crystals

Cholesteric Liquid Crystal Materials for Tunable Diffractive Optics

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