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Published: 2012
Released on J-STAGE: January 10, 2017
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Published: 2012
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Article type: Appendix
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Published: August 20, 2012
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Published: August 20, 2012
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Published: August 20, 2012
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Jun-ichi Hanna
Article type: Article
Pages
i-iv
Published: 2012
Released on J-STAGE: January 10, 2017
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The electronic conduction in discotic and smectic liquid crystals was established in 1990s. That let us recognize that liquid crystals were a new type of organic semiconductors, i.e., self-organizing molecular semiconductor, and opened a door to a new research field in liquid crystals. Since then, 20 years have passed, and its basic research that has been accumulated slowly but steadily during these decades is going to provide us with a new industrial application of liquid crystals. In this talk, the present status of liquid crystals as an organic semiconductor will be reviewed from materials, properties, and device applications' points of view shortly and the recent progress that promises immediate application to organic field effect transistors will be discussed.
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Shinichiro OKA, Tomohiko Naganuma, Shinichi Komura, Toshio Miyazawa
Article type: Article
Session ID: S1
Published: August 20, 2012
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We have investigated a 3D display using a Liquid Crystal Gradient Refractive Index (LC GRIN) lens and the factors needed to decrease crosstalk. Currently, the crosstalk of the latest 3D display using LC GRIN lens have been 0.6%.
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Kenichi Takatori, Yoshihiro Nonaka
Article type: Article
Session ID: S2
Published: August 20, 2012
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The shape of traditional TFT LCDs is rectangular or square. The application area of TFT LCDs becomes wider and is getting into our surroundings with a variety of complex shapes and forms. A non-rectangular SOG-LCD has been developed by a well-polished system-integration technology including an arrangement in space. Driver circuits integrated along with curved sides of a heart-shaped screen with a hollow and an array of pixels slanting 45 degrees offer narrow bezels of less than 2 mm. This new technology enables LCD modules to be designed with varied, more flexible shapes that can be adapted to nontraditional LCD applications.
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Haruhiko Okumura, Takashi Sasaki, Aira Hotta, Akihisa Moriya, Tsuyoshi ...
Article type: Article
Session ID: S3
Published: August 20, 2012
Released on J-STAGE: January 10, 2017
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We developed a novel depth perception control method for a monocular head-up display. The method utilizes movement of picture on the HUD as a depth perception cue and achieves a depth perception position of 120m with an error of 30%.
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Haruyoshi Toyoda, Takashi Inoue, Hiroshi Tanaka
Article type: Article
Session ID: S4
Published: August 20, 2012
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We have designed and developed a spatial light modulator named LCOS-SLM (Liquid crystal silicon-spatial light modulator) to achieve pure, linear and precise phase control with high diffraction efficiency. We have applied this device for fundamental research of singular optics and several practical applications as laser machining, microscope, and adaptive optics. In this paper, we introduce basic characteristics of LCOS-SLM and some experimental results on the research and the applications.
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Daigo Miyajima, Takuzo Aida, Fumito Araoka, Hideo Takezoe
Article type: Article
Session ID: 1a05
Published: August 20, 2012
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Despite a large number of ferroelectric liquid crystals, none of them possess spontaneous polarization along their columnar axes. The development of such ferroelectric liquid crystals has been awaited not only for fundamental science but also practical application because they are promising for high-density memory devices. Here we present the first columnar ferroelectric liquid crystal we recently developed with the focus on how we designed the molecular structure.
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Fumito Araoka, Inseon Seo, Hideo Takezoe, Daigo Miyajima, Takuzo Aida
Article type: Article
Session ID: 1a06
Published: August 20, 2012
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In this study, we have made couples of nonlinear optical (NLO) measurements on our recently-discovered axial ferroelectric columnar liquid crystal (FCLC). Second harmonic generation (SHG) method was utilized as a probe for spontaneous polarization and its reversal. Besides, visible-infrared sum-frequency generation (SFG) spectroscopy was carried for FCLC upon E-field application, which strongly supports our model proposed in the previous study. And hence this confirms the validity of our strategical molecular design to realize FCLC.
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Yoshiaki Uchida, Katsuaki Suzuki, Rui Tamura
Article type: Article
Session ID: 1a07
Published: August 20, 2012
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To identify the origin of the magneto-LC effects, which refers to the enhancement of intermolecular magnetic interactions in LC phases, we have designed and synthesized H-bonded all-organic radical compounds showing nematic and cholesteric phases for the first time. They show stronger magneto-LC effects than in the same LC phases of analogous covalent-bonded all-organic radical LC compounds. Variable-temperature electron paramagnetic resonance spectroscopy of the hydrogen-bonded compounds reveals that the inhomogeneous intermolecular contacts give rise to the magneto-LC effects.
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Masashi IKEGAMI, Takeo SASAKI, Yumiko NAKA
Article type: Article
Session ID: 1a08
Published: August 20, 2012
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The photorefractive effect of FLCs mixed with a series of photoconductive chiral dopants was investigated. A terthiophene was chosen as a photoconductive moiety and a chiral structure was introduced. The photoconductive chiral dopant was mixed with a liquid crystalline material. It was confirmed that the liquid crystalline mixtures exhibited both ferroelectricity and photoconductivity. The mixture exhibited a large gain coefficient of 720cm^<-1> with application of only 1.1V/μm external electric field.
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Keisuke Ide, Masafumi Yoshio, Takahiro Ichikawa, Satomi Taguchi, Hiroy ...
Article type: Article
Session ID: 1a09
Published: August 20, 2012
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Fan-shaped molecules containing ammonium salt moieties have been designed and synthesized to develop bicontinuous cubic liquid crystals exhibiting high ionic conductivities. The effects of the molecular structures and the induced liquid-crystalline phases on ionic conductivities have been examined.
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Kaori Fujisawa, Yuichi Izumi, Yusuke Onishi, Osamu Tsutsumi
Article type: Article
Session ID: 1a10
Published: August 20, 2012
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Liquid-crystalline(LC) behavior and photoluminescent properties of a gold(I) complexes, 1a, 1b, 1c, and 1d were investigated. One of the complexes 1b showed enantiotropic LC phases. In addition, the complexes showed blue photoluminescence in the crystalline phase, but no luminescence were observed in a dilute solution. The quantum yields of photoluminescence were 8〜50%, and depended on aggregation structure in crystalline phases. The complexes also showed photoluminescence in LC phase and in I phase. We demonstrated that reversible change in photoluminescent behavior was induced by phase transition.
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Tomohiro Yamashita, Keita Horie, Munju Goh, Kazuo Akagi
Article type: Article
Session ID: 1a11
Published: August 20, 2012
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We synthesized axally chiral binaphthyl derivatives containing asymmetric center moieties, and added it to high temperature nematic liquid crystal (N-LC) mixture (4 compounds mixture) to prepare thermally helicity-controllable chiral N-LC (N^*-LC). The N^*-LC showed a left-handed helical structure when the temperature increased from -26 to 14℃. It became a nematic phase in the temperature range of 14 to 21℃, and then showed a right-handed chiral nematic phase when the temperature increased from 21 to 49℃. The helical polyacetylene (H-PA) was synthesized in the N^*-LC and the helical sense of H-PA was well controlled by changing the polymerization temperature.
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Seiji Ujiie, Genichiro Shimada, Masanori Nata
Article type: Article
Session ID: 1a12
Published: August 20, 2012
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Main chain liquid crystal polyurethanes (LCPUs) with hydroxyl and amino groups were synthesized by the polyaddition reaction of a diisocyanate group, -N=C=O with a dihydroxyl group, -OH. Their phase transitions and orientational behavior were examined. LCPUs with a hexamethylene chain did not exhibit a mesophase. LCPUs with a biphenyl core formed a monotropic nematic phase. LCPUs with a tolylene core revealed a glass transition and a nematic-isotropic phase transition. The schlieren texture was observed in the nematic phase. LCPUs with a tolylene core formed a nematic glass phase. The fibers of LCPUs were obtained by fiber-drawing in the liquid-crystalline state. The fibers of LCPUs having an azobenzene group showed a photoisomerization at room temperature.
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Mitsuo Hara, Shusaku Nagano, Takahiro Seki
Article type: Article
Session ID: 1a13
Published: August 20, 2012
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Poly(methacrylate) containing azobenzene unit-block-poly(methacrylate) containing oligo(ethylene glycol) methyl ether unit was synthesized by atom transfer radical polymerization method. The diblock copolymer/silica hybrid film was prepared by spin-cast method. The resulting film was characterized by X-ray diffraction measurement and atomic force microscope observation. As a result, the hybrid film had microphase-separated structure with vertical alignment. We also achieved removal of organic component by UV/O_3 oxidization using vacuum ultraviolet apparatus, and then the nano-ordered height contrast appeared. This methodology provides a facile approach to inorganic nanostructures with tunable lateral spacing and size. Furthermore, this approach can be extended to construction systems of other morphologies by controlling weight fraction of precursor contents.
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Takahiro kasai, Osamu Sato, Masatoshi Tokita, Sungmin Kang, Junji Wata ...
Article type: Article
Session ID: 1a14
Published: August 20, 2012
Released on J-STAGE: January 10, 2017
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The orientation of a nematic liquid crystal (NLC) on high-density polystyrene (PS) brushes was examined. The NLC injected into the cell consisting of the PS-grafted substrates was oriented by cooling the cell from isotropic temperature of LC to room temperature (RT) at a magnetic field. While the cell exhibited electro-optical properties typical for the LC cells at RT, at higher temperature showed the behaviors that are explainable if the anchoring molecules rotates in the field-on state, and in the subsequent field-off state.
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Jun-ichi Fukuda
Article type: Article
Session ID: 1b04
Published: August 20, 2012
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We investigate how the variation of the Frank elastic constants affects the stability of cholesteric blue phases (BPs). Our theoretical argument is based on a classical theory of Meiboom et al. that considered the energetic contribution of disclination lines, and the surface-like elasticity characterized by K_<24>. We extended the original theory of Meiboom et al. that assumed one-constant elasticity to the case of unequal elastic constants. We show that larger K_<11> and K_<22> and smaller K_<33> is beneficial to the stability of BPs. In particular, drastically wider temperature range of stable BPs for small K_<33> is in agreement with recent experiments.
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Mika OIWA, Shintaro TAKEDA, Shinichi KOMURA
Article type: Article
Session ID: 1b05
Published: August 20, 2012
Released on J-STAGE: January 10, 2017
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It is known that the temperature range of polymer-stabilized blue phase (PSBP) is extended by the polymer network induced in the disclination. The temperature range is associated with a monomer which is polymerized by UV. Although it is not well known that relationship between the temperature range and the polymer network structure. In this report, we discuss the relationship between the observed polymer network structure and the temperature range of PSBP. We have found that the polymer network structure in liquid crystal segregates and the temperature range was not extended, when solubility of the monomer in the liquid crystal is poor.
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Mitsuru Sugimoto, Yohei Nishikawa, Shoichi Ishihara
Article type: Article
Session ID: 1b06
Published: August 20, 2012
Released on J-STAGE: January 10, 2017
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A fast secondary electro-optical effect (that is Kerr effect) will be observed in blue phase liquid crystals, and many researches and developments have been carried out aggressively toward a practical application. However, measured voltage-transmittance characteristics do not always fit closely with calculated ones and it has been a big problem in a design of liquid crystal devices. Here, by taking into account not only electronic polarization but also the deformation of blue phase structure, that is the rotation of liquid crystal directors, it was found that the simulated result corresponded with the experimental one well.
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Gihwan Lim, Yasushi Okumura, Hiroki Higuchi, Hirotsugu Kikuchi
Article type: Article
Session ID: 1b07
Published: August 20, 2012
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Generally, liquid crystal blue phases (BP) appear in a narrow temperature range about 1K between chiral nematic phase and isotropic one. We extended temperature range of BP to more than 60K by polymerization of various monomers in BP. We measured temperature dependence of electro-optic effect and dielectric relaxation of this polymer-stabilized blue phase (PSBP) at low temperature, and found maximum of Kerr coefficient. Through reflection spectra, we found that the ordered structure of PSBP changes into disordered one with lowering temperature, and that PSBP with lower monomer ratio and longer chiral pitch holds an ordered structure until lower temperature.
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Shuhei Yabu, Hiroki Tone, Hiroyuki Yoshida, Hirotsugu Kikuchi, Masanor ...
Article type: Article
Session ID: 1b08
Published: August 20, 2012
Released on J-STAGE: January 10, 2017
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We proposed a method to measure the electro-optical effects of a blue phase liquid crystals (BPLCs) using a two-beam interference microscope combining a Mach-Zehnder interferometer with a polarized reflection microscope. The two-beam interference microscope enable us to simultaneously measure phase modulation and the change of Bragg reflection wavelength attributed to the local reorientation of LC molecules and electrostriction of BPLCs, respectively. We investigated the field intensity depen-dency, temperature dependency, and time response of the phase modulation and reflection spectra.
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Kota Kakisaka, Hiroki Higuchi, Yasushi Okumura, Hirotsugu Kikuchi
Article type: Article
Session ID: 1b09
Published: August 20, 2012
Released on J-STAGE: January 10, 2017
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Fluorinated nematic liquid crystals (LCs) are used commonly as TFT-LC display materials because they show a low viscosity, a high voltage holding ratio and a high responsivity. Binaphthyl derivatives are well known as chiral dopants which show a large helical twisting power (HTP). In this study, we aim at the development of chiral dopants with a large HTP and a high solubility in the fluorinated nematic LC and designed novel fluorinated binaphthyl chiral dopants. In addition, we investigated properties of blue phases induced by adding the chiral dopant to the fluorinated nematic LC.
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Jun Yoshioka, Yoichi Takanishi, Jun Yamamoto
Article type: Article
Session ID: 1b10
Published: August 20, 2012
Released on J-STAGE: January 10, 2017
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We analyzed orientational relaxation modes in cholesteric liquid crystals using dynamic light scattering(DLS) and electro-optic(EO) response measurements. Assuming that the helical pitch is constant in the deformation process, we theoretically predicted the dispersion relation of two orthogonal relaxation modes in which the director slightly deforms from equilibrium state, and compared the modes with experimental results. Dispersion relation measured in the DLS completely satisfies our theoretical prediction, and extrapolated relaxation frequency (q→0) also coincides with that obtained by the EO measurement. Furthermore, it was found that the helical pitch dependence was well-explained by our theoretical model.
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Kenji Tagashira, Keita Asakura, Genki Nakazawa, Hiroyuki Yoshida, Masa ...
Article type: Article
Session ID: 1b11
Published: August 20, 2012
Released on J-STAGE: January 10, 2017
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When hydrophobized colloidal particles are introduced into nematic liquid crystals (NLCs), topological defects are induced in the vicinity of the particle. Consequently, elastic attractive or repulsive forces act between particles, and one- or two-dimensional colloidal structures are formed. In this study, we demonstrate an expansion of inter-particle distance of a colloidal chain-like structure in nematic liquid crystals. By applying an in-plane electric field in the direction perpendicular to the colloidal chain-like structure, a line defect is induced on the structure. Consequently, we observe the expansion of the structure by up to 33%.
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Shinji Bono, Yoko Ishii, Masayuki Yokoyama, Yoichi Takanishi, Jun Yama ...
Article type: Article
Session ID: 1b12
Published: August 20, 2012
Released on J-STAGE: January 10, 2017
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We investigated the size effect on the isotropic-nematic phase transition of the liquid crystal confined in the core of the nano-micelles. Various sizes of the liquid crystalline nano micelles can be prepared by changing the mixing ratio of low molecular weight thermotropic liquid crystals to surfactants which serve as the micellar shell. From temperature dependence of the depolarized dynamic light scattering intensity, it was found that the nematic-isotropic phase transition behavior changes from the weak first order to second order due to the 3 dimensional confinement(〜100nm).
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Tomonori Koda, Tomohiro Konno, Hitomi Nomura, Akihiro Nishioka, Ken Mi ...
Article type: Article
Session ID: 1b13
Published: August 20, 2012
Released on J-STAGE: January 10, 2017
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System of helical fragella isolated from bacteria is known to show structure called conical phase. Conical phase is induced by the fact that the particles are helixes. In this study we perform Monte Carlo simulation of hard repulsive helixes as model particles of helical fraggela to explain existence of the conical phase. For analysis of the simulation results, we introduce a novel order parameter that describes the structure of the conical phase.
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Satoshi Aya, Anna Zep, Kenji Aihara, Fumito Araoka, Ken Ishikawa, Kenj ...
Article type: Article
Session ID: 1c03
Published: August 20, 2012
Released on J-STAGE: January 10, 2017
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A new series of non-symmetric calamitic liquid crystal forming dimers based on a cholesterol group in the terminal have been synthesized and characterized by polarizing microscopy, high sensitive differential scanning calorimetry and X-ray diffraction. It is shown that a metastable blue phase, existing in between isotropic and lower nematic-like phase over 30 degrees only on cooling, is very stable with respect to an external electric field; The electrostriction and kerr response were observed without any electric field-induced phase transition from blue phase to cholesteric phase even under very high electric field strength, 〜20 V/μm. The detailed discussions will be made on the conference.
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Satoshi Aya, Haruki Ohara, Fumito Araoka, K. Okano, Ken Ishikawa, T. Y ...
Article type: Article
Session ID: 1c04
Published: August 20, 2012
Released on J-STAGE: January 10, 2017
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We represent characteristic traits of a newly-synthesized calamitic LC compound (hereafter referred to as compound X) with an azo linkage. In order to determine elastic constants, Freedericksz transition method was used. By measuring the Freedericksz threshold voltage of the deformation of the director field induced by an electric field, K_<33>'s at each temperature were obtained. Surprisingly, it exhibits prodigious values over its wide nematic temperature range, 〜50 times larger compared to conventional calamitic LC, 〜10 pN. To our best knowledge, such a unprecedented mega-K_<33> has been only available for polymer LC or Gel-confined LC systems, because of the rigid network in these systems inhibiting LC molecules to bend. The phenomena are analogous to external-field driven ones.
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Atsuo Fukuda
Article type: Article
Session ID: 1c05
Published: 2012
Released on J-STAGE: January 10, 2017
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We have tried to understand the extraordinary phase sequence, i.e. the emergence of super-latice structures with 4-, 5-, and 6-layer unit cells above SmC
*, by combining the phenomenological short-range interlayer interaction and the effective long-range interlayer interactions devised by Emelyanenko and Osipov[PRE, 68 (2003) 051703].
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Kiyoaki Usami, Sarabjot Kaur, Verena Gortz, John W. Goodby, Helen F. G ...
Article type: Article
Session ID: 1c06
Published: 2012
Released on J-STAGE: January 10, 2017
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We have found that large optically isotropic chiral domains can be generated in the optically isotropic phase of an oxadiazole material (C5-Ph-ODBP-Ph-OC12) by applying an electric field. The optically isotropic phase exists below the nematic phase. We applied a triangular electric field to C5-Ph-ODBP-Ph-OC12 cells (thickness: 〜5μm) in the optically isotropic phase. The amplitude was varied to 400 V
pp. We found that the domain size depends on both the amplitude and frequency of the applied field. Our results suggest that the phase of the optically isotropic chiral domains induced by the electric field is a B2 dark conglomerate phase.
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Yohei Nishikawa, Mitsuru Sugimoto, Shoichi Ishihara
Article type: Article
Session ID: 1c07
Published: August 20, 2012
Released on J-STAGE: January 10, 2017
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Kerr effect of liquid crystals which is characterized by its fast response has been observed in an isotropic phase or in a pseudo isotropic phase such as a blue phase. However, liquid crystals with large electronic polarization generally have large dipole moment, and dipole polarization is simultaneously observed in the low frequency range. Then, we tried to induce only electronic polarization in a nematic phase by using a homeotropic cell filled with p-type nematic liquid crystals. And we confirmed that it was possibly based on Pockels effect, as the induced birefringence was proportional to the magnitude of electric field.
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Takuya Ikeda, Satoshi Aya, Fumito Araoka, Ken Ishikawa, Hideo Takezoe, ...
Article type: Article
Session ID: 1c08
Published: August 20, 2012
Released on J-STAGE: January 10, 2017
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Liquid crystal CCN47 shows a discontinuous anchoring transition on amorphous perfluoropolymer (CYTOP) surface. We have proposed and demonstrated novel memory devices in a bistable temperature range in which both planar and homeotropic alignments are equally stable. In this presentation, we will show that the addition of azo-containing liquid crystalline dendrimers into the liquid crystal makes the writing power much lower than that in the previous device using the liquid crystal with conventional dyes.
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Takuya Ohzono, Jun-ichi Fukuda
Article type: Article
Session ID: 1c09
Published: August 20, 2012
Released on J-STAGE: January 10, 2017
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Microwrinkles are strain-induced surface undulations, which form on an elastomer surface capped by a hard thin layer. The sinusoidal grooves can serve as open capillary channels, providing a unique micro-confinement of liquids. When a liquid crystal is confined there, its alignment can be distorted and topological defects may be produced due to the specific boundary conditions. Here, we report periodic defect structures self-organized in a nematic or smectic-A liquid crystal confined within microwrinkle grooves.
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K. Isobe, H. Takezoe, K. Ishikawa
Article type: Article
Session ID: 1c10
Published: 2012
Released on J-STAGE: January 10, 2017
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A continuous transition between SmC
* and SmC
A* phases in a binary mixture was studied by electric field induced birefringence (EFIB) and selective reflection measurements. We observed a divergent behavior of selective reflection and valley structure in the EFIB around 366K. We also found chimneys both sides of the valley in EFIB. These characteristic features are attributed to some intermediate states. We will discuss the possible structures of these intermediate states.
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Shin-ya Sugisawa, Yuki Harada, Sho Hanehara, Yuka Tabe
Article type: Article
Session ID: 1c11
Published: August 20, 2012
Released on J-STAGE: January 10, 2017
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Under DC electric field, bubbles composed of smectic LCs sometimes exhibit the unique dynamics as well as the macro deformations. We observed a string-like pattern appearing on the bubble surface during a short period just after the DC electric field was applied. As 2D Rayleigh-Taylor instability, we examined and analyzed the observed string patterns, which may be used for a liquid jet technology.
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Go Watanabe, Yuka Tabe
Article type: Article
Session ID: 1c12
Published: August 20, 2012
Released on J-STAGE: January 10, 2017
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Smectic liquid crystalline monolayers have long been studied as the ideal two-dimensional system. In spite of that, the diffusion behavior of smectic monolayers, which is one of the important fundamental physical properties, has not been understood yet. For the purpose of analyzing this property, we carried out molecular dynamics simulations for the system of smectic monolayers. As a result, it was figured out that the diffusion parallel to the director is much faster than the one perpendicular to the director. It suggests that the inplane molecular diffusion in the smectic monolayer is not isotropic, but anisotropic.
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Richard James, Jun-ichi Fukuda
Article type: Article
Session ID: 1c13
Published: August 20, 2012
Released on J-STAGE: January 10, 2017
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Liquid crystal colloids comprising spherical particles have been extensively studied, but less is known about colloids made up of non-spherical particles. They give rise to a richer set of defect states and so interact in a more complex manner. To better understand how individual anisotropic particles behave, we have investigated stable liquid crystal defect structures about rod-shaped inclusions by means of the Landau-de Gennes continuum theory. Of particular interest are cylindrical particles, which have been found to, in experiment, incline with respect to the background director. We explore this effect to ascertain the influence of a particle's shape and dimensions on its equilibrium orientation and inclination.
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Kenji Aihara, Wataru Takeda, Yuji Sasaki, Kenji Ema
Article type: Article
Session ID: 1c14
Published: 2012
Released on J-STAGE: January 10, 2017
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We report results of calorimetric measurement on R-S mixture of MHPOBC. Dynamic heat capacity measurements in the vicinity of SmC
*-SmC
*α transition have been carried out with very low freaquency ac calorimetry. The aim of the present investigation is to identify the location of a SmC
*-SmC
*α critical point and characterize the critical behavior associated with heat capacity at that point.
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Hirohisa Miki, Daiichi Suzuki, Yukio Tanaka, Midori Tsukane, Mitsutaka ...
Article type: Article
Session ID: 2a01
Published: August 20, 2012
Released on J-STAGE: January 10, 2017
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We have newly developed hybrid 3D display with both auto-stereoscopic and glasses modes using time-sequential OCB, 8.0inch WVGA panel, and light directional backlight. Both modes enable us to see full-resolution 3D images, especially in glasses mode the images are 3D crosstalk-free. As for the auto-stereoscopic mode, we have also reduced the amount of visible crosstalk compared with the existing development. To use our hybrid 3D system, users can see clear 3D, less ghosting, images with both modes and can easily choose glasses on or not according to what they want to see.
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Yukio HIRANO
Article type: Article
Session ID: 2a02
Published: August 20, 2012
Released on J-STAGE: January 10, 2017
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We developed image-sticking measuring technique for Fringe-Field-Switching (FFS) mode, and have developed materials. In FFS mode, electric field strength near electrode edge is strong, and various image-sticking occur. There are electrical factor and alignment factor in these image-sticking, and it is important for development of liquid crystal materials and alignment-film materials. We observed anchoring and easy axis stability about the alignment factor, and took notice of change of transmission and flicker about the electrical factor. We introduce the developed technique and some experimental data.
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Koichiro Goto, Chang Xiao-Jun, Rumiko Yamaguchi, Oleg Yaroshchhuk
Article type: Article
Session ID: 2a03
Published: August 20, 2012
Released on J-STAGE: January 10, 2017
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We have prepared reverse-mode polymer dispersed liquid crystal cells (R-PDLC) with homogeneous and twisted namatic orientation based on a nematic LC and a small amount of reactive mesogen (RM) which show a transparent off-state and a light scattering on-state. In this work, the mixture of a nematic LC and a RM was polymerized by irradiating with UV light under the voltage application. As a result, the driving voltage of the cells is reduced when the voltage of polymerization is 1.6V. Also, the cells show a light scattering off-state and a transparent on-state when the voltage of polymerization is 6.5V
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Shintarou Sakurai, Rumiko Yamaguchi
Article type: Article
Session ID: 2a04
Published: August 20, 2012
Released on J-STAGE: January 10, 2017
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We have proposed reverse-mode polymer dispersed liquid crystal (R-PDLC) devices based on a nematic LC and a small amount of reactive mesogen. In this work, we have studied on cell gap dependence on electric optical properties in reverse mode PDLC cells with homogeneous,TN and STN orientation modes. A polymer-rich layer near the substrate and a polymer-poor layer model was proposed and the dependence on a contrast ratio and driving voltage were discussed.
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Yosuke AIHARA, Motoi KINOSHITA, Jun-ichi MAMIYA, Atsushi SHISHIDO
Article type: Article
Session ID: 2a05
Published: August 20, 2012
Released on J-STAGE: January 10, 2017
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It is well known that low-molecular-weight liquid crystals doped with a dye molecule can undergo photoinduced molecular reorientation upon irradiation with a Gaussian laser beam. The phenomenon is a nonlinear optical effect, and it takes place only above certain threshold intensity. In this study, an oligothiophene derivative was doped into polymerizable liquid-crystalline mixtures, and the aligned samples were polymerized. Photoresponsive behavior of the resultant liquid-crystalline polymer film was studied.
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Takashi Sato, Yumiko Naka, Takeo Sasaki
Article type: Article
Session ID: 2a06
Published: August 20, 2012
Released on J-STAGE: January 10, 2017
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Types of oligo-thiophene photoconductive chiral dopants for photorefractive ferroelectric liquid crystals were synthesized. The photorefractive effect of FLCs containing photoconductive chiral dopants was investigated. In order to add the photoconductivity to the FLC, photoconduvtive moiety was introduced to the chiral dopants. The effect of the structure of the chiral dopants on the photorefractive effect was inrestigated.
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Hiroyuki Yoshida, Junji Kobashi, Takayuki Matsui, Atsushi Miura, Naoki ...
Article type: Article
Session ID: 2a07
Published: August 20, 2012
Released on J-STAGE: January 10, 2017
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One of the challenges in metamaterial research is to make them tunable so as to enable on-demand switching of their properties. Although liquid crystals are attractive candidates as tunable materials, an important issue which needs to be addressed is the alignment of liquid crystals on nanostructured surfaces: non-uniform or multi-stable alignment of liquid crystals can occur, deteriorating optical performance. In this study, we demonstrate uniform alignment control of nematic liquid crystals on a metallic nanohole array, and demonstrate tuning of optical properties through refractive index modulation. Our strategy for alignment control is based on vapor-phase deposition of a fluorosilane monolayer that induces alignment of liquid crystals.
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Naoya Hamana, Yumiko Naka, Takeo Sasaki
Article type: Article
Session ID: 2a08
Published: August 20, 2012
Released on J-STAGE: January 10, 2017
CONFERENCE PROCEEDINGS
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A photoconductive compound and an electron accepter were mixed with a ferroelectric liquid crystal(FLC), and the mixtures were injected into 10μm and 20μm thick cells. Uniformly aligned surface stabilized state was obtained even in 20μm thick samples. Ferroelectricity and photorefractive properties of those samples were examined. The relationship between photorefractive properties and of the thickness of the FLC cell was discussed.
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