Results 151 to 160 of about 57,281 (193)

High birefringence photopolymerizable phenylacetylene liquid crystals

Liquid Crystals, 2001
Photopolymerizable three-ring phenylacetylene (3PA) liquid crystalline compounds were synthesized and the physical properties of the monomers and polymers were characterized in the expectation of obtaining high birefringence polymers. 3PA monomers containing acrylate substituents exhibited enantiotropic nematic phases and high δn values of around 0.35.
Chizu Sekine, Kazunori Iwakura, Masayoshi Minai, Koichi Fujisawa   +3 more
openaire   +1 more source

Liquid crystalline materials with high birefringence

Journal of Optical Technology, 2005
The mesogenic, optical, and dielectric properties of the new mixtures of high-birefringence nematic liquid crystals based on isothiocyanatotolanes are investigated, and examples of multicomponent mixtures with low viscosity and optical anisotropy Delta n approximately 0.4 are presented.
A. Spadlo, R. Dabrowski, J. Dziaduszek, E. Scibior, S. Urban, S. Gauza, S. T. Wu   +6 more
openaire   +2 more sources

High birefringence photonic crystal fiber design

SPIE Proceedings, 2009
A novel high birefringence photonic crystal fiber (PCF) was proposed, which consists of hexagonal inner ring and octagonal outer ring. A full vector finite element was applied to investigate the mode birefringence and chromatic dispersion. It has been demonstrated from the calculated results that high birefringence to the order of 0.001 can be ...
Feifei Shi, Meicheng Li, Yu Zhao, Liancheng Zhao   +3 more
openaire   +1 more source

Dynamic birefringence of several high polymers

Journal of Polymer Science Part C: Polymer Symposia, 1964
AbstractThe complex strain‐optical coefficient, complex stress‐optical coefficient, complex modulus of elasticity and the corresponding loss tangent of phase angles between the stress, strain and birefringence have been measured for several high polymers in the frequency range from 0.001 to 10 cycles/sec.
R. Yamada, C. Hayashi, S. Onogi, M. Horio   +3 more
openaire   +1 more source

Novel high birefringence dibenzothiophenylacetylene liquid crystals

Liquid Crystals, 2002
We have designed, synthesized and evaluated dibenzothiophenylacetylene homologues as new heterocyclic molecules which were expected to have high δα values and short wavelength UV absorption spectra. The dibenzothiophenyl acetylene homologues exhibited wide nematic phase ranges and had very high extrapolated δn of over 0.6 and directly measured values ...
Chizu Sekine, Masamitsu Ishitobi, Kazunori Iwakura, Masayoshi Minai, Koichi Fujisawa   +4 more
openaire   +1 more source

ChemInform Abstract: High Birefringence Liquid Crystals

ChemInform, 2014
AbstractReview: 133 refs.
Roman Dabrowski, Przemyslaw Kula, Jakub Herman   +2 more
openaire   +1 more source

UV Stable High Birefringence Liquid Crystals

Japanese Journal of Applied Physics, 2004
High birefringence and low viscosity nematic liquid crystal single compounds and mixtures were developed and their properties evaluated. The UV stability of the single isothiocyanianes liquid crystal compounds was studied by different methods. Excellent UV durability of some of the single high birefringence isothiocyanianes was discovered.
Gauza, Sebastian, Wen, Chien Hui, Tan, Bijun, Wu, Shin Tson   +3 more
openaire   +2 more sources

High Birefringence Optical Fibre Pressure Sensor

SPIE Proceedings, 1988
A remote passive pressure sensor has been demonstrated using a high birefringence optical fibre. The principle is based upon a single fibre polarimetric interferometer and the technique for aligning the birefringence axes of the fibre. The design incorporates a temperature compensation and allows the use of low coherence sources.
M. Farhadiroushan, I. P. Giles
openaire   +1 more source

High Birefringence Isothiocyanato Tolane Liquid Crystals

Japanese Journal of Applied Physics, 2003
The phase transition temperatures, birefringence and visco-elastic coefficient of several high birefringence isothiocyanato tolane compounds were evaluated. The polarizability of these compounds was calculated by the Austin Model 1 (AM1) and Modified Neglect of Diatomic Overlap (MNDO) methods.
Sebastian Gauza, Haiying Wang, Chien-Hui Wen, Shin-Tson Wu, Alexander J. Seed, Roman D\cabrowski   +5 more
openaire   +2 more sources

High birefringence terahertz photonic crystal fiber

Optical Engineering, 2013
A new high birefringence terahertz photonic crystal fiber is pro- posed. The properties of birefringence, confinement loss, and chromatic dispersion are studied by using full-vector finite-element methods with an anisotropic perfectly matched layers absorption boundary condition. The cladding contains several periodically arranged diamond-shaped units,
Jian Tang, Zhigang Zhang, Deng Luo, Ming Chen, Hui Chen   +4 more
openaire   +1 more source