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Keiichi Kimura Ryoko Mizutani Tatsuya Suzuki Masaaki Yokohama 《Journal of inclusion phenomena and macrocyclic chemistry》1998,32(2-3):295-310
Design of two types of ion-conducting systems using photochromic crown ethers as the photocontrol agents is described; one type is based on the phase transition of azobenzene derivatives induced by their photoisomerization and the other based on the molecular control of metal ion complexation by crowned spirobenzopyrans. The photoresponsive ion-conducting systems are applicable to electrostatic imaging and photorefractive materials. 相似文献
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Photochromic acrylates containing both biphenylene and spiro-oxazine moieties with a chiral substituent and the related polymers were prepared and yielded photochromic chiral liquid crystalline systems. The photochromic acrylates containing both an undecamethylene group and a (2S, 3S)-2-chloro-3-methylpentanoyloxy group (A11SOP) or a (-)-menthoxyacetoxy group (A11SOM) gave a supercooled mesophase; the latter reflected right-handed visible light (blue colour) at room temperature. On the other hand, the photochromic acrylate containing both the (R)-(-)-2-methylpropylene and (2S, 3S)-2-chloro-3-methylpentanoyloxy groups (A3SOP) showed no mesophase. The related homopolymers, PA11SOP and PA11SOM, did not exhibit mesophases because of steric hindrance between the side groups of the polymers. However, only PA11SOM exhibited shear-induced birefringence under 100-104°C. Several copolymers consisting of the nematogenic monomer, 4-[4-(6-acryloyloxyhexyloxy)benzoyloxy]benzonitrile (A6CN), and A11SOP or A11SOM possessed a smectic phase due to reduction of the steric hindrance between the potentially smectogenic A11SOP or A11SOM moieties. 相似文献
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S. Yu. Paranchich L. D. Paranchich V. N. Makogonenko V. R. Romanyuk M. D. Andriichuk Yu. V. Tanasyuk 《Journal of Applied Spectroscopy》2003,70(3):427-431
The optical and photoelectric properties of CdTe:V crystals with the doping impurity concentration N
V = 5·1018–5·1019 cm–3 are investigated and the possibility of their use as a photorefractive material is considered. As is seen from the spectra of optical transmission, the crystals of both types possess high transparency (50–65%), which for CdTe:V specimens with N
V = 5·1019 cm–3 decreases sharply and in the range 12–14 m does not exceed 5%, whereas for CdTe:V crystals with vanadium concentration of 5·1018 cm–3 such a value of transmission remains unchanged up to 25 m, implying a good optical quality of the latter crystals and their possible application in the spectral range 1.06–1.25 m in modern fiber-optic communication lines. 相似文献
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载氢光纤在255.3nm激光辐照下的光折变效应 总被引:2,自引:1,他引:1
首次报道采用铜蒸气倍频255.3nm紫外激光辐照载氢光纤产生的光折变效应。所测到的光折变量已可满足制作光折变光纤光栅的需要。 相似文献
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We present a technique, based on optical polarizing microscopy, and results of direct observation of the optical interference
field effect on the transient domains excited by ac electric field in a nematic planar cell with photosensitive aligning layers.
The light source used in a microscope operated in DC mode as well as in triggered pulse one. Obtained microscopic snapshots
of transient domain structure confirmed our assumption of the transient domains reordering (trapping) by the low intensity
optical interference field. 相似文献
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Naoto Tsutsumi Akihito Dohi Asato Nonomura Wataru Sakai 《Journal of Polymer Science.Polymer Physics》2011,49(6):414-420
We present the enhanced photorefractive performance of high molecular weight poly(N‐vinyl carbazole) (PVCz)‐based composites. Higher diffraction efficiency with faster speed of grating build‐up was obtained by optimizing the composition of the PVCz composites. At relatively low applied electric field of E = 45 V μm?1, diffraction efficiency of 26% for p‐polarized probe beam and corresponding that of 5.1% for s‐polarized probe beam were measured with faster grating build‐up speed of 48.3 s?1 for the composite with 2,4,7‐trinitrofluorenone (TNF) as a sensitizer. Fastest speed of grating build‐up of 100 s?1 and large optical gain up to 110 cm?1 were measured at E = 80 V μm?1 for the composite with fullerene derivative of PCBM as a sensitizer. These improved performances are due to a large orientational enhancement effect with faster response speed in addition to Pockels effect for the samples with appropriate glass transition temperature. © 2011 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2011 相似文献
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