Results 251 to 260 of about 21,925,565 (312)

New Nematics with High Birefringence

Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, 1995
Abstract We prepared new compounds with the hexendiyne unit as central bridging group. The substances are nematic, with clearing temperatures much higher than those of other two ring compounds. They show the highest birefringence ever observed in liquid crystals, modest viscosities and medium dielectric anisotropy. Their stability in low polar mixtures
Y. Goto, T. Inukai, A. Fujita, D. Demus
openaire   +1 more source

High Birefringence Photonic Crystal Fibers

Materials Science Forum, 2010
Photonic crystal fiber (PCFs) offer new possibilities of realizing highly birefringence fibers due to a higher intrinsic index contrast compared to conventional fibers. Here, based on general section structure of PCFs, we take some mend in the core configuration, and achieve highly birefringence effect.
Shu Qin Guo, Min Ge, Pan Zhuang, Li Ping Chang   +3 more
openaire   +1 more source

High birefringence liquid crystalline materials

2008 IEEE/LEOS Winter Topical Meeting Series, 2008
In this paper, nematic liquid crystalline materials and its mesogenic and physicochemical properties (mainly birefringence, dielectric anisotropy, and viscosity) will be discussed. The influence of number and position of fluorosubstitution on the ability of nematic phase formation in broad temperature range and on the value and sign of dielectric ...
R. Dabrowski, S. Gauza, J. Dziaduszek, P. Kula, S. Urban, S. T. Wu   +5 more
openaire   +2 more sources

PCF with low dispersion and high birefringence

2015 International Conference on Electrical, Electronics, Signals, Communication and Optimization (EESCO), 2015
Photonic Crystal Fibers (PCFs) structure with unique arrangement of circular air holes has been investigated. The structure has circular air holes of different areas and those air holes are arranged in a unique fashion. Both TE and TM mode has shown zero dispersion. A very low loss and high birefringence was observed for the structure.
Pranaw Kumar, Ruplata Kumari, Nayak, Satya Sourav, Swarup Mund   +3 more
openaire   +1 more source

Embedded multicore hollow fiber with high birefringence

Applied Optics, 2011
We fabricate and demonstrate a hollow fiber with multiple embedded cores (MCHF) based on a modified "suspended core-in-tube" preform technique. Its birefringence properties are controlled by the MCHF core's ovality, which could be controlled by the applied pressure and drawing temperature in the MCHF preform.
Fengjun, Tian, Libo, Yuan, Qiang, Dai, Zhihai, Liu   +3 more
openaire   +2 more sources

Benzoxazole-terminated liquid crystals with high birefringence and large dielectric anisotropy

, 2020
Six benzoxazole-terminated mesogenic compounds with fluoro substituent at different positions were prepared and their properties investigated. The compounds give a high birefringence (Δn~ 0.45) and a large-dielectric anisotropy (Δε~ 26), indicating a ...
K. Hu, Q. Weng, Ran Chen, Jian Li, Dingqian Shi, Pei Chen, Aiai Gao, Xinbing Chen, Zhongwei An   +8 more
semanticscholar   +1 more source

Strain and temperature discrimination based on a Sagnac interferometer with three sections of high birefringence fibers

, 2020
We present an all-fiber sensor for strain and temperature discrimination by inserting three sections of high birefringence fibers into a Sagnac loop. The principle for strain and temperature discrimination is based on monitoring the wavelength shifts of ...
Zhichao Ding, Zhongwei Tan
semanticscholar   +1 more source

Photonic crystal fibers with high birefringence and multiple zero dispersion wavelengths

, 2020
A type of total internal reflection photonic crystal fiber (TIR-PCF) with high birefringence and multiple zero dispersion wavelengths is presented. The optical characteristics are numerically investigated by using the full-vector finite element method ...
Erlei Wang, Peng Cheng, Weining Zhao, Jia Li, Q. Han, Xiaodong Zhou   +5 more
semanticscholar   +1 more source

Influence of the fiber diameter on the stress birefringence in high-birefringence fibers

Optics Letters, 1983
The influence of the outer diameter of the constraining region on the stress-induced birefringence in high-birefringence fibers is investigated for three fiber structures. Generally, the outer diameter should be three times larger than the mean diameter of the stress-producing regions to ensure that the birefringence is close to maximum.
S C, Rashleigh, M J, Marrone
openaire   +2 more sources

Light-emitting high birefringence chlorinated bistolanes

Journal of Molecular Liquids, 2021
Abstract Eight both symmetrical and non-symmetrical bistolanes with terminal alkyl-, alkoxy- and alkysulphanyl- chain and lateral chlorine atom have been synthesized via Sonogashira cross-coupling and their mesomorphic, optical and photoluminescence properties have been studied.
Dorota Węgłowska, Przemysław Kula
openaire   +1 more source