Improved Method for the Dispersion of Refractive Indices Based on Transmission Spectroscopic Ellipsometry

Goda, Kazuya; Kimura, Masaaki; Ariga, Tadashi

doi:10.1080/15421406.2011.572025

Cited by 4 publications

(5 citation statements)

References 10 publications

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“…Here, the elastic constants of the mixture of 5CB and the merocyanine dye were assumed to be the same as those of pure 5CB, i.e., K 11 6.37, K 22 3.81, and K 33 8.60 pN at 25°C. The refractive indices of ordinary and extraordinary rays for 5CB, which were preliminarily determined in our previous study [22,23], are listed in Table 1.…”

Section: Methodsmentioning

confidence: 99%

Evaluation technique of cell thickness, pretilt angle, and twist angle for guest–host liquid crystal displays

et al. 2013

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In this study, we demonstrated the evaluation of the device parameters, such as the cell thickness d, pretilt angles at the top and bottom substrates θ0 and θd, and twist angle φt for the guest-host (GH)-type electrically controlled birefringence (ECB) and twisted nematic (TN) modes, using the renormalized transmission ellipsometry (RTE). In the proposed technique, the extended Cauchy equation and the extinction coefficients for the ordinary and extraordinary rays based on the three Gaussian functions were employed as a description of the dielectric function. As a result, the numerically calculated phase difference Δ and angle of amplitude ratio Ψ determined using the proposed technique provided good agreement with the measured Δ and Ψ by introducing the extinction coefficient to the RTE. Furthermore, the device parameters for the GH-ECB and the GH-TN cells were obtained. It was confirmed that the extinction coefficient should be taken into consideration in an analysis of GH liquid crystal displays.

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Section: Methodsmentioning

confidence: 99%

Evaluation technique of cell thickness, pretilt angle, and twist angle for guest–host liquid crystal displays

et al. 2013

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“…Based on plural incidence renormalized transmission spectroscopic ellipsometry, the wavelength dispersion associated with birefringence was assessed using both the TN and ECB cells. Details of these measurement procedures have been provided in a previous paper [21]. The LC texture was examined by crossed nicols polarizing optical microscopy (POM, Eclipse LV100 POL, Nikon, Tokyo, Japan).…”

Section: Methodsmentioning

confidence: 99%

Shear-Thinning Characteristics of Nematic Liquid Crystals Doped with Nanoparticles

et al. 2016

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This work investigated changes in the physical properties of nematic liquid crystals (NLCs) upon doping with nanoparticles. Shear viscosity measurements demonstrated the shear-thinning of typical NLCs following the addition of small amounts of nanoparticles at approximately 1 wt. %. However, neither the birefringence nor the dielectric anisotropy was significantly affected at these levels of doping. The shear-thinning appears to result from the locally ordered alignment of the NLCs in the vicinity of the nanoparticles rather than from reductions in the bulk order parameters.

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“…By using the extended Cauchy equation, the expression of the refractive indices of ordinary and extraordinary rays of NLC is described as

\begin{array}{c} center & n_{normalo} (λ) = α_{0} + \frac{α_{2}}{λ^{2}} + \frac{α_{4}}{λ^{4}} \\ center & n_{normale} (λ) = β_{0} + \frac{β_{2}}{λ^{2}} + \frac{β_{4}}{λ^{4}} \end{array},

where α i and β i represent the i th Cauchy coefficients and λ is the wavelength in micrometers. The Cauchy coefficients of ZLI‐4792 are shown in Table and were determined by means of RTE …”

Section: Experimental Methodsmentioning

confidence: 99%

“…The Cauchy coefficients of ZLI-4792 are shown in Table 2 and were determined by means of RTE. 19,23,24 In this experiment, a color filter laminated on a glass substrate is employed. Here, the alternating stripe patterns of red, green, and blue of color filters are 100 mm, and the thickness of the glass substrate is 0.7 mm.…”

Section: Renormalized Transmission Ellipsometry On An Lc Cell Equippementioning

confidence: 99%

Evaluation of azimuthal anchoring energy for liquid crystal device equipped with color filter by means of renormalized transmission ellipsometry

2012

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In this study, we theoretically investigated the influence of a color filter on the determination of the azimuthal anchoring energy by means of ellipsometric analysis, and the azimuthal anchoring energy of the twisted nematic (TN) liquid crystal devices (LCDs) equipped with/without a color filter was evaluated by means of renormalized transmission ellipsometry. The results indicated no influence in the obtained ellipsometric parameters, such as the phase difference and the angle of amplitude ratio, when a color filter was an isotropic medium. It was experimentally confirmed that the evaluated azimuthal anchoring energy of LCD with a color filter was almost the same as that without a color filter. From the numerical and experimental study, the possibility for the determination of the azimuthal anchoring energy for the commercial TN LCD products was demonstrated.

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Improved Method for the Dispersion of Refractive Indices Based on Transmission Spectroscopic Ellipsometry

Cited by 4 publications

References 10 publications

Evaluation technique of cell thickness, pretilt angle, and twist angle for guest–host liquid crystal displays

Evaluation technique of cell thickness, pretilt angle, and twist angle for guest–host liquid crystal displays

Shear-Thinning Characteristics of Nematic Liquid Crystals Doped with Nanoparticles

Evaluation of azimuthal anchoring energy for liquid crystal device equipped with color filter by means of renormalized transmission ellipsometry

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