Tunable Optical Grating Based on the Flexoelectric Effect in a Bent-Core Nematic Liquid Crystal

Xiang, Ying; Jing, Hongzhen; Zhang, Zhidong; Ye, Wenjiang; Xu, Ming-Ya; Wang, Everett; Szűcs, Péter; Éber, Nándor; Buka, Ágnes

doi:10.1103/physrevapplied.7.064032

Cited by 29 publications

(15 citation statements)

References 34 publications

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“…However, experimental studies of the nonlinear behavior of flexodomains are not so often found in the literature; we are only aware of Refs. [10][11][12][13][14]. One finds here indeed a linear behavior of p(U ) with a reference to Ref.…”

Section: Introductionsupporting

confidence: 69%

“…Instead of systematic studies of parameter variations, which would go beyond the scope of this paper, we will restrict ourselves to selected nematics, which have not shown electroconvection under an applied dc voltage and where the material parameters are known to some extent. In detail we analyze thus experiments in the nematic mixtures Phase 4 [18] and Phase 5 [19,20], the rodlike compound 4-n-octyloxyphenyl 4-n-methyloxybenzoate (1OO8) [21], and a bent-core nematic 2,5-di4-[(4-heptylphenyl)difluoromethoxy]-phenyl-1,3,4-oxadiazole (7P-CF 2 OODBP) [14].…”

Section: Flexodomains In Real Nematics: Experiments and Theorymentioning

confidence: 99%

“…[21]. Data for the bent-core nematic 2,5-di4-[(4-heptylphenyl)-difluoromethoxy]-phenyl-1,3,4-oxadiazole (7P-CF 2 OODBP) [14] are not available, thus those of the similar substance 2,5-di4-[(4-heptylphenyl)difluoromethoxy]-phenyl-1,3,4-oxadiazole (9P-CF 2 OODBP) are taken from Ref. [24].…”

Section: Appendix F: Experimental and Theoretical Data And Materials Pmentioning

confidence: 99%

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Nonlinear analysis of flexodomains in nematic liquid crystals

et al. 2018

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We investigate flexodomains, which are observed in planar layers of certain nematic liquid crystals, when a dc voltage U above a critical value U c is applied across the layer. They are characterized by stationary stripelike spatial variations of the director in the layer plane with a wave number p(U). Our experiments for different nematics demonstrate that p(U) varies almost linearly with U for U > U c. That is confirmed by a numerical analysis of the full nonlinear equations for the director field and the induced electric potential. Beyond this numerical study, we demonstrate that the linearity of p(U) follows even analytically, when considering a special parameter set first used by Terent'ev and Pikin [Sov. Phys. JETP 56, 587 (1982)]. Their theoretical paper serves until now as the standard reference on the nonlinear analysis of flexodomains, since it has arrived at a linear variation of p(U) for large U U c. Unfortunately, the corresponding analysis suffers from mistakes, which in a combination led to that result.

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Section: Introductionsupporting

confidence: 69%

Section: Flexodomains In Real Nematics: Experiments and Theorymentioning

confidence: 99%

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Nonlinear analysis of flexodomains in nematic liquid crystals

et al. 2018

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“…So far, most of the research effort on FDs has been focused on the electrical characteristics of FDs, like the threshold voltage and the voltage dependent periodicity . Recently, tunability of these characteristics by an additional magnetic field has also been reported; nevertheless, the effect of light illumination has not yet been considered.…”

Section: Introductionmentioning

confidence: 99%

Light Tunable Gratings Based on Flexoelectric Effect in Photoresponsive Bent‐Core Nematics

Jing

Xiang

et al. 2019

Advanced Optical Materials

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A new photoresponsive bent‐core nematic (BCN) material, which exhibits flexoelectric domains (FDs) driven by electric field, is reported. Unexpectedly, it is found that the morphologies of FDs can be controlled by irradiation with light fields. This light tunability is ascribed to the photoisomerization effect of the azo moiety within the BCN molecules, where the ratio of trans and cis isomers changes according to the parameters of the light field, resulting in adjustable electric threshold and periodicity of FDs. Based on this principle, a prototype of controllable optical grating is assembeled, whose operation can be manipulated by the wavelength or intensity of light. Due to the easy, instant, and remote operation by light, this optical, contactless tunability has a great advantage over traditional electric control in tunable photonic devices.

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“…Recently, a tunable optical grating made of flexoelectric domains in a bent‐core nematic liquid crystal has been reported . Bent‐core liquid crystals have very unique physical properties, which arise from the specific shape of the constituent molecules .…”

Section: Introductionmentioning

confidence: 99%

Polarization Gratings Spontaneously Formed from a Helical Twist‐Bend Nematic Phase

et al. 2018

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Spontaneous formation of polarization gratings by liquid crystalline phase made of bent dimeric molecules is reported. The grating is formed within the temperature range of the twist bend modulated nematic phase, N , without the necessity to pattern the cell surfaces, therefore the modulated nematic phase is a promising candidate for low-cost modulators and beam steering devices, the polarization properties of which depend on temperature. In addition, the study of the diffracted light properties turns out to be a sensitive measuring technique for determination of the 3D spatial variation of the optic axis in the cell.

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Tunable Optical Grating Based on the Flexoelectric Effect in a Bent-Core Nematic Liquid Crystal

Cited by 29 publications

References 34 publications

Nonlinear analysis of flexodomains in nematic liquid crystals

Nonlinear analysis of flexodomains in nematic liquid crystals

Light Tunable Gratings Based on Flexoelectric Effect in Photoresponsive Bent‐Core Nematics

Polarization Gratings Spontaneously Formed from a Helical Twist‐Bend Nematic Phase

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