Enhancing Birefringence by Doping Fluorinated Phenyltolanes

Gauza, Sebastian; Zhao, Yang; Cor, Tatiana Le; Wu, Shin‐Tson; Dziaduszek, Jerzy; Sasnouski, Genadź; Dąbrowski, R.; Chien, Liang–Chy

doi:10.1109/jdt.2006.885160

Cited by 16 publications

(4 citation statements)

References 10 publications

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“…Many such mixtures with Δn values in the range 0.3-0.7 have been demonstrated so far [49,50,91,93,94,101,111,122,124,128]. Mixtures with a broad range of nematic phases and birefringence values of Δn = 0.3-0.45 are now available with an acceptable level of viscosity (γ < 300 mPa· s), see example Mixtures 1791 and 1825 composed of fluoro-substituted alkyltolane and alkylphenyl tolane isothiocyanates have the highest birefringence among those presented in Table 17.…”

Section: Mixture Formulationmentioning

confidence: 99%

High Birefringence Liquid Crystals

2013

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Liquid crystals, compounds and mixtures with positive dielectric anisotropies are reviewed. The mesogenic properties and physical chemical properties (viscosity, birefringence, refractive indices, dielectric anisotropy and elastic constants) of compounds being cyano, fluoro, isothiocyanato derivatives of biphenyl, terphenyl, quaterphenyl, tolane, phenyl tolane, phenyl ethynyl tolane, and biphenyl tolane are compared. The question of how to obtain liquid crystal with a broad range of nematic phases is discussed in detail. Influence of lateral substituent of different kinds of mesogenic and physicochemical properties is presented (demonstrated). Examples of mixtures with birefringence ∆n in the range of 0.2-0.5 are given.

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Section: Mixture Formulationmentioning

confidence: 99%

High Birefringence Liquid Crystals

2013

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“…Meanwhile, new LC materials with greater birefringence have been successively reported. [18][19][20] We have developed a room-temperature nematic LC NJU-LDn-4 with an average birefringence of greater than 0.3 from 0.5 to 2.5 THz, which is 2.5 times the birefringence of traditional E7 (,0.12 in the THz region). 21 This material improvement remarkably reduces the required cell gap, thus decreasing the operating voltage and response time.…”

Section: Introductionmentioning

confidence: 99%

Broadband tunable liquid crystal terahertz waveplates driven with porous graphene electrodes

et al. 2015

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Versatile devices, especially tunable ones, for terahertz imaging, sensing and high-speed communication, are in high demand. Liquid crystal based components are perfect candidates in the optical range; however, they encounter significant challenges in the terahertz band, particularly the lack of highly transparent electrodes and the drawbacks induced by a thick cell. Here, a strategy to overcome all these challenges is proposed: Few-layer porous graphene is employed as an electrode with a transmittance of more than 98%. A subwavelength metal wire grid is utilized as an integrated high-efficiency electrode and polarizer. The homogeneous alignment of a high-birefringence liquid crystal is implemented on both frail electrodes via a non-contact photo-alignment technique. A tunable terahertz waveplate is thus obtained. Its polarization evolution is directly demonstrated. Furthermore, quarter-wave plates that are electrically controllable over the entire testing range are achieved by stacking two cells. The proposed solution may pave a simple and bright road toward the development of various liquid crystal terahertz apparatuses.

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“…Over the past few years, different isothiocyanato compounds were investigated, for example, by Catanescu and Chien 17 as well as by our group. [18][19][20][21][22][23][24] These studies led to the selection of the following, particularly promising compounds, see Figure 1.…”

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confidence: 99%

Highly birefringent, low-loss liquid crystals for terahertz applications

et al. 2013

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With growing interest in switchable devices for the THz frequency range, there is a strong demand for liquid crystals (LC) exhibiting both a high birefringence and a low absorption. We present the refractive index and absorption coefficient of the liquid crystal mixtures 1852 and 1825 in the frequency range between 0.2 and 2.5 THz. Both mixtures are designed specifically for high birefringence Δn of 0.32 and 0.38, respectively, in the THz region. In addition, they show low absorption coefficients for both ordinary and extraordinary polarization. This low absorbance in combination with the high birefringence makes these LCs particularly well suited for applications in switchable devices for THz optics

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Enhancing Birefringence by Doping Fluorinated Phenyltolanes

Cited by 16 publications

References 10 publications

High Birefringence Liquid Crystals

High Birefringence Liquid Crystals

Broadband tunable liquid crystal terahertz waveplates driven with porous graphene electrodes

Highly birefringent, low-loss liquid crystals for terahertz applications

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