Electrooptic Effects in Liquid Crystal Materials

Blinov, L. M.; Chigrinov, Vladimir G.

doi:10.1007/978-1-4612-2692-5

Cited by 809 publications

(608 citation statements)

References 13 publications

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“…In a uniaxial nematic, the direction of average orientation is specified by the director n with the properties 2 1  n and ˆ n n [17][18][19] . The long-range orientational order makes all the properties of the nematic anisotropic.…”

Section: Orientational Order and Anisotropy Of Liquid Crystalsmentioning

confidence: 99%

Transport of particles in liquid crystals

2014

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Section: Orientational Order and Anisotropy Of Liquid Crystalsmentioning

confidence: 99%

Transport of particles in liquid crystals

2014

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“…(11). For the electromagnetic wave linearly polarized along the x-axis this rate can be written as follows [12,41]:…”

Section: Modelmentioning

confidence: 99%

Photoinduced three-dimensional orientational order in side chain liquid crystalline azopolymers

et al. 2003

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We apply experimental technique based on the combination of methods dealing with principal refractive indices and absorption coefficients to study the photoinduced 3D orientational order in the films of liquid crystalline (LC) azopolymers. The technique is used to identify 3D orientational configurations of trans azobenzene chromophores and to characterize the degree of ordering in terms of order parameters. We study two types of LC azopolymers which form structures with preferred in-plane and out-of-plane alignment of azochromophores, correspondingly. Using irradiation with the polarized light of two different wavelengths we find that the kinetics of photoinduced anisotropy can be dominated by either photo-reorientation (angular redistribution of trans chromophores) or photoselection (angular selective trans-cis isomerization) mechanisms depending on the wavelength. At early stages of irradiation the films of both azopolymers are biaxial. This biaxiality disappears on reaching a state of photo-saturation. In the regime of photoselection the photo-saturated state of the film is optically isotropic. But, in the case of the photo-reorientation mechanism, anisotropy of this state is uniaxial with the optical axis dependent on the preferential alignment of azochromophores. We formulate the phenomenological model describing the kinetics of photoinduced anisotropy in terms of the isomer concentrations and the order parameter tensor. We present the numerical results for absorption coefficients that are found to be in good agreement with the experimental data. The model is also used to interpret the effect of changing the mechanism with the wavelength of the pumping light.

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“…According to the Frank elastic continuum theory (Blinov and Chigrinov 1994), the LC molecule director distribution will be stable when its net free energy is minimized. The theoretical model considered for the steady-state analysis of nematic LC materials is based on the Oseen-Frank free-energy equation (Gennes and Prost 1993).…”

Section: Mathematical Model Of Liquid Crystal Cellmentioning

confidence: 99%

“…The value of this threshold voltage is only a function of the material's physical parameters, such as the viscosity and elastic constants, and is independent of the cell's thickness. The threshold voltage can be described by following equation (Blinov and Chigrinov 1994):…”

Section: Liquid Crystal Fourier Transform Spectrometer System 165mentioning

confidence: 99%

Compact Liquid Crystal Based Fourier Transform Spectrometer System

Huang

Wang

2010

International Journal of Optomechatronics

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Fourier transform spectroscopy (FTS) is a fundamental analytical tool utilized in many chemical and biological analysis applications. It is especially well-known and widely used for its powerful analytical techniques to measure the spectra of a weakly extended source. The purpose of this study is to create a compact, low-cost FTS system utilizing a miniature liquid crystal interferometer. This design is unique because the optical path difference (or phase difference) is controlled by the applied voltage. The optical path difference is further improved by incorporating two reflective mirrors between the two polarizers. In this article, we will present the theoretical model, numerical simulation, and experimental results of the proposed FTS. Based on the experimental results, the FTS performs in accordance with the theoretical predictions, achieves a maximum optical path difference of 210 m, and a resolution of 1nm at a wavelength of 630 nm. The instrumental response refresh rate is just under 1 second. Absorbance measurements were conducted for single and mixed solutions of deionized water and isopropyl alcohol, successfully demonstrating agreement with a commercial system and literature values.

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Electrooptic Effects in Liquid Crystal Materials

Cited by 809 publications

References 13 publications

Transport of particles in liquid crystals

Transport of particles in liquid crystals

Photoinduced three-dimensional orientational order in side chain liquid crystalline azopolymers

Compact Liquid Crystal Based Fourier Transform Spectrometer System

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