A simple method to determine high-accuracy refractive indices of liquid crystals and the temperature behavior of the related optical parameters via high-resolution birefringence data

Özbek, Haluk; Üstünel, Şenay; Kutlu, E.; Cetinkaya, M.C.

doi:10.1016/j.molliq.2014.09.003

Cited by 32 publications

(11 citation statements)

References 56 publications

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“…Here, n e and n o are extraordinary and ordinary refractive index, respectively. At T = 38 °C, the Δ n eff of 8CB is ≈0.13, referring to the previous reports . In this condition, the retardation, which is the multiplication of Δ n eff and cell thickness, here ≈4.5 µm, is around 590 nm, which exhibits the purple color.…”

Section: Resultssupporting

confidence: 70%

“…The color of the LC defect array is changed in the respective order of indigo, violet, purple, deep‐red, orange, yellow, and white with increasing temperature from 35 to 40.5 °C under the given electric field condition of V 0 = 30 V, f = 3 kHz (Figure b). Furthermore, the periodic LC defect pattern is faded out at the transition point to the isotropic phase at T = 42 °C due to a decrease in Δ n eff of 8CB . Accordingly, the color change triggered by a temperature seems to be similar to the color variation induced by changing the applied frequency (Figure a,c).…”

Section: Resultsmentioning

confidence: 76%

“…In this condition, the cell thickness is fixed as 4.5 µm. Therefore, the light retardation is changed as a function of the effective birefringence of LC, Δ n eff = n e − n o , which is decreased upon heating due to the reduced order parameter, leading to the decrease in the n e while n o is increased . Here, n e and n o are extraordinary and ordinary refractive index, respectively.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Reconfigurable Periodic Liquid Crystal Defect Array via Modulation of Electric Field

You

Choi

Shin

et al. 2019

Adv Materials Technologies

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Topological defects in liquid crystal (LC) phases have been considered critical from the areas in topology and self‐assembly, as well as in applications such as optical vortex generation, particle manipulation system, and template for material micropatterning. An approach for generating and modulating various patterns of LC defects is presented in a single cell by varying the electrode configurations. Periodic LC defect arrays including −1 topological defect in the nematic phase can be achieved by simply adjusting crossed electrodes. Specifically, the fourfold symmetric −1 defect pattern is used as a vortex beam generator and a particle trapping agent with control either of the frequency of the applied electric field or the temperature. The approach suggested here would be beneficial to extend the use of LC patterns in lithographic tools and optoelectronic devices.

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Section: Resultssupporting

confidence: 70%

Section: Resultsmentioning

confidence: 76%

Section: Resultsmentioning

confidence: 99%

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Reconfigurable Periodic Liquid Crystal Defect Array via Modulation of Electric Field

You

Choi

Shin

et al. 2019

Adv Materials Technologies

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“…But then, for both pure and doped 8CB samples, upon lowering temperature towards the Sm A phase, systematic deviations from the fits are observed signaling the influence of the pre-transitional Sm A behavior [62,63]. By inspection of these deviations one can infer that the pre-transitional smectic behavior continues up to 3.6 K on average for both pure and doped 8CB samples [62,63]. Notice that a similar value for the exponent λ was reported for 5CB LC previously [61].…”

Section: Resultsmentioning

confidence: 94%

Temperature-dependent electro-optical and elastic properties of carbon nanotube doped polar smectogen octylcyanobiphenyl

Yildiz

Köseoglu

Cetinkaya

2015

Journal of Molecular Liquids

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“…By taking temperature derivatives of Eqs. (10) and (11), the temperature gradient for n e and n o can be derived [9,[19][20][21][22][23][24].…”

Section: Modelingmentioning

confidence: 99%

Temperature Effects on Liquid Crystal Nonlinearity

Al-Qurainy¹,

Naimee²

2018

Liquid Crystals - Recent Advancements in Fundamental and Device Technologies

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The effect of temperature variation on nonlinear refractive indices of several types of liquid crystal (LC) compounds has been reported. Five samples have been investigated: two pure components (E7, MLC 6241-000) and three mixtures are obtained by mixing the previous two in different proportions. Birefringence, the average refractive index and the temperature gradients of refractive indices of the LCs are determined. The variations in refractive indices and birefringence were fitted theoretically using the modified Vuks equation. Excellent agreement is obtained between the fitted values and experimental data. Finally, the bistability of nonlinear refractive indices with temperature of liquid crystal (LC) compounds has been studied. The bistability of liquid crystals based on temperature is clearly observed for all samples. Also, the extraordinary refractive index has larger bistability than the ordinary refractive index. The measurements are performed at 1550 nm wavelength using wedged cell refractometer method.

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A simple method to determine high-accuracy refractive indices of liquid crystals and the temperature behavior of the related optical parameters via high-resolution birefringence data

Cited by 32 publications

References 56 publications

Reconfigurable Periodic Liquid Crystal Defect Array via Modulation of Electric Field

Reconfigurable Periodic Liquid Crystal Defect Array via Modulation of Electric Field

Temperature-dependent electro-optical and elastic properties of carbon nanotube doped polar smectogen octylcyanobiphenyl

Temperature Effects on Liquid Crystal Nonlinearity

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