Electrically variable liquid crystal lens based on the dielectric dividing principle

Sova, Oleksandr; Reshetnyak, Victor; Galstian, Tigran; Asatryan, K. E.

doi:10.1364/josaa.32.000803

Cited by 28 publications

(6 citation statements)

References 12 publications

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“…In addition, it was shown [14] that the oscillatory character of the dependences is caused by the configuration of the LC director in an individual domain. Light intensity oscillations in [12][13][14] were interpreted only qualitatively using the gradient optics approach [15]. These previous studies were performed with the use of partially polarized laser radiation, and it was not excluded the possibility of decisive influence of the polarization on the interference oscillations.…”

Section: Introductionmentioning

confidence: 99%

Interference of nonpolarized light in liquid crystal domains on a polymer surface

et al. 2019

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The interference of the nonpolarized light transmitted through an ensemble of nematic liquid crystal domains formed on the polycarbonate surface has been investigated. A model based on the superposition of the ordinary and extraordinary beams passed through domains with the radial structure has been developed. Expressions for the phase difference and intensity of the interfering beams, which take into account the distribution of the liquid crystal director field, have been derived. The dependences of the optical transmittance of a domain layer on the applied voltage have been calculated with regard to the material and optical constants of a liquid crystal and structural features and averaged morphological parameters of individual domains in the experimental sample. The results of the calculation are consistent with the experimental data, which confirms the validity of the proposed model.

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Section: Introductionmentioning

confidence: 99%

Interference of nonpolarized light in liquid crystal domains on a polymer surface

et al. 2019

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“…From this result, several explanations were postulated that the sizes of the protrusions were influenced by several factors, such as elastic energy distribution of the host LC medium, caused under electric field, and chemical affinity between MAPOSS and the materials of the substrate. The elastic energy of the host LC medium is changed gradually when the host LC molecules are reoriented under an electric field. − To prove experimentally whether the electric field influenced the determination of the sizes of protrusions, Ita3C 12 and MAPOSS were polymerized in the multidomain electrode cell without applying electric field. The identical result was obtained, as shown in Figure S3.…”

Section: Resultsmentioning

confidence: 99%

Construction of Polymer-Stabilized Automatic MultiDomain Vertical Molecular Alignment Layers with Pretilt Angles by Photopolymerizing Dendritic Monomers under Electric Fields

et al. 2017

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The synthesized itaconic acid-based dendritic amphiphile (Ita3C 12 ) monomers and the methacryl polyhedral oligomeric silsesquioxane (MAPOSS) cross-linkers were directly introduced for the construction of automatic vertical alignment (auto-VA) layers in the host nematic liquid crystal (NLC) medium. The auto-VA layer can be stabilized by irradiating UV light. For the automatic fabrication of a polymer-stabilized multidomain VA (PS auto-MDVA) layer with a pretilt angle, Ita3C 12 and MAPOSS were photopolymerized under the electric field by irradiating UV light on the multidomain electrode cell. Mainly because of the pretilted NLC at zero voltage, the electro-optic properties of the PS auto-MDVA cell were dramatically improved. From the morphological observations combined with surface chemical analyses, it was found that various sizes of protrusions on the solid substrates were automatically constructed by the two-step mechanisms. We demonstrated the PS auto-MDVA cell with the enhancement of electro-optic properties as a single-step process and investigated how the protrusions were automatically developed during the polymer stabilization.

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“…An example of such a device based on this dielectric dividing principle is shown in Figure 5d, where varying ε sub from ε 1 to ε 2 across the device, V LC can be smooth. Practically, such substrates have been achieved with various techniques; for example, building the substrate of two materials, the relative thicknesses of which modulate ε sub [67,68]. Alternatively, NLCs themselves can form this dielectric structure where, for example, Polymer Dispersed Liquid Crystals (PDLC) can be arranged to adopt a structure of the required permittivity and then cured into place [69,70].…”

Section: Lensesmentioning

confidence: 99%

Liquid Crystal Devices for Beam Steering Applications

2021

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Liquid crystals are valuable materials for applications in beam steering devices. In this paper, an overview of the use of liquid crystals in the field of adaptive optics specifically for beam steering and lensing devices is presented. The paper introduces the properties of liquid crystals that have made them useful in this field followed by a more detailed discussion of specific liquid crystal devices that act as switchable optical components of refractive and diffractive types. The relative advantages and disadvantages of the different devices and techniques are summarised.

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Electrically variable liquid crystal lens based on the dielectric dividing principle

Cited by 28 publications

References 12 publications

Interference of nonpolarized light in liquid crystal domains on a polymer surface

Interference of nonpolarized light in liquid crystal domains on a polymer surface

Construction of Polymer-Stabilized Automatic MultiDomain Vertical Molecular Alignment Layers with Pretilt Angles by Photopolymerizing Dendritic Monomers under Electric Fields

Liquid Crystal Devices for Beam Steering Applications

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