Electro-optic response times in liquid crystals

Jakeman, E.; Raynes, E. P.

doi:10.1016/0375-9601(72)90332-5

Cited by 282 publications

(71 citation statements)

References 8 publications

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“…According to Equations (2) and (3) [26,27], for small LC reorientation angles with the supplied voltage slightly above Vth, both rise (τr) and fall (τf) times of the LC cell can be estimated by the effective rotational viscosity ηi,…”

Section: Introductionmentioning

confidence: 99%

Electro-optical Effect of Gold Nanoparticle Dispersed in Nematic Liquid Crystals

et al. 2017

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Abstract:The electro-optical performance of nematic liquid crystals (NLCs) dispersed with gold nanoparticles (GNPs) was investigated in this study. The addition of a small amount of GNP dopant decreased the threshold voltage for LC reorientation due to the decreased elastic constant and increased dielectric anisotropy of the LC mixture. The response time of the LC cell was decreased with the addition of tiny amounts of GNPs because of decrease in rotational viscosity of LCs. The doped GNPs also shorten LC reorientation angle during voltage switching, further decreasing the response time of the LC cell. The addition of high amounts of GNPs slowed down the response time of the LC cell, because excess GNPs aggregated and formed networks in the cell, thus disturbing LC alignment and hindering LC reorientation. The measured dielectric spectra of the GNP-LC mixture revealed that the addition of GNPs decreased the relaxation time constant of the LCs. This result confirmed that the GNP dopant decreased the rotational viscosity and elastic constant of the LCs.

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Section: Introductionmentioning

confidence: 99%

Electro-optical Effect of Gold Nanoparticle Dispersed in Nematic Liquid Crystals

et al. 2017

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“…Now, we show that the reduction in γ 1 has a significant effect in the LC's switching times. The two characteristic times, 44 rise (voltage on) and decay (voltage off), of the nematic director can be described as…”

Section: -mentioning

confidence: 99%

Evidence of nanodiamond-self-assembly in a liquid crystal, and the consequent impacts on the liquid crystal properties

et al. 2017

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A small quantity of nanodiamonds (NDs) was dispersed in a nematic liquid crystal (LC), and the NDs were found to exhibit an anisotropic self-assembly along the nematic director. The anisotropic assembly of the NDs in the LC matrix was probed by measuring the dielectric anisotropy, Δε, of the LC+ND system, which showed a significant increase in Δε. Additional studies revealed that the presence of NDs reduced the rotational viscosity and the pretilt angle of the LC. The studies were carried out with several ND concentrations in the LC and the experimental results coherently suggest that there exists an optimal concentration of ND. Above this optimal ND concentration, the anisotropic assembly of the NDs was found to be not effective anymore. The rotational viscosity and the pretilt angle of the LC were found to increase above the optimal concentration of ND.

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“…The electro-optic effect of a parallel-aligned LC layer in the small signal regime has been studied previously [14]. When V is not far from V th (V th < V < ffiffiffi 2 p V th ), the small angle approximation is valid.…”

Section: Theorymentioning

confidence: 99%

“…The LC directors rise time s rise and decay time s decay are known to be proportional to d 2 , where d is the cell gap. However, the theoretical derivation of this d 2 dependence is based on the small angle approximation [14]. Thus, these equations are valid only in the V th < V < ffiffiffi 2 p V th region, marked as Part I in Figure 1, where V is the applied voltage and V th is the threshold voltage.…”

Section: Introductionmentioning

confidence: 99%

Cell Gap Effect on the Dynamics of Liquid Crystal Phase Modulators

Wang

Nie

Tie-jun

et al. 2006

Molecular Crystals and Liquid Crystals

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This paper provides a complete physical picture of optical response time as a function of cell gap (d) in a wide voltage regime. Normally both rise and decay times are known to be proportional to d 2 in the small angle approximation (V th < V < ffiffiffi 2 p V th ), and in the high voltage regime where V p < V < V i the optical decay time is independent of d. In this paper, we found that between these two extremes there is a region where the response time is linearly proportional to d. Our analytical derivation is confirmed by experimental results.

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Electro-optic response times in liquid crystals

Cited by 282 publications

References 8 publications

Electro-optical Effect of Gold Nanoparticle Dispersed in Nematic Liquid Crystals

Electro-optical Effect of Gold Nanoparticle Dispersed in Nematic Liquid Crystals

Evidence of nanodiamond-self-assembly in a liquid crystal, and the consequent impacts on the liquid crystal properties

Cell Gap Effect on the Dynamics of Liquid Crystal Phase Modulators

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