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A Novel Titania Membrane with Uniform Macropores

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Chinese Physics Letters 2001年第12期18卷 1610-1612页

作者： NI Pei-Gen cheng bing-ying DONG Peng ZHANG Dao-Zhong Optical Physics Laboratory Institute of Physics and Center for Condensed Matter PhysicsChinese Academy of SciencesBeijing 100080 State Key Laboratory of Heavy Oil Processing University of PetroleumBeijing 102200

A procedure for fabricating novel TiO_(2) membrane materialwith sub-micrometre pores and large specific surface area from the template has been demonstrated. The morphology and structure of the membrane have been characterized by scanning electron microscopy. The results have indicated that the macroporous membraneconsists of uniform hollow spheres which are interconnected to each other by 'small windows'. Potential unique applications of this macroporous materialin the fields of catalysis, optics, sensors, etc, are suggested.

关键词： pores Uniform catalysis

Effects of Spherical Aberration on Optical Trapping Forces for Rayleigh Particles

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Chinese Physics Letters 2001年第3期18卷 432-434页

作者： YAO Xin-cheng LI Zhao-Lin GUO Hong-Lian cheng bing-ying ZHANG Dao-Zhong Optical Physics Laboratory Institute of Physics and Center for Condensed Matter PhysicsChinese Academy of SciencesBeijing 100080

The Trapping force on Rayleigh particles in an optical tweezers system with an oil immersion objective is calculated by an electromagnetic *** results indicate that the stability of particles trapped will be affected by spherical aberration,which is caused by refractive difference between objective oil and water solution,when the specimen manipulated is suspended in a water *** trapping force and depth of potential well will decrease and the minimum of laser power for ensuring the stability of particles trapped will increase with the enhancing trapping depth.

关键词： trapping Rayleigh stability

A Novel Two-Dimensional Photonic Crystal

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Chinese Physics Letters 1999年第1期16卷 20-22页

作者： JIN Chong-jun LI Zhao-lin ZHANG Dao-zhong cheng bing-ying Laboratory of Optical Physics Institute of Physics&Center for Condensed Matter PhysicsChinese Academy of SciencesBeijing 100080

A novel two-dimensional photonic crystal that possesses absolute photonic band gaps for both transverse-magnetic and transverse-electric polarized waves is *** wave method is used for calculating their photonic band *** show that,for this structure,two absolute photonic band gaps appear in dielectric cylinders periodically imbedded in an air background.

关键词： absolute transverse cylinders

Structure and Transmission Spectra for Colloidal Crystals with Silica Spheres

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Chinese Physics Letters 1998年第1期15卷 21-23页

作者： MEI Dong-bin DONG Peng LI Hong-qiang cheng bing-ying ZHANG Dao-zhong Optical Physics Laboratory Institute of Physics&Center for Condensed Matter PhysicsChinese Academy of SciencesBeijing 100080 National Heavy Oil Research Laboratory University of PetroleumBeijing 102200

An ordered colloidal structure of SiO_(2) spheres of 0.33μm diameter has been formed in distilled *** is a face-centered cubic structure with a lattice constant of 0.54μm and a volume fraction of 0.48,as determined by the Kossel rings *** light transmission in the[111]direction exhibited a dip located at 11600cm^(-1).A plane wave expansion method is used to calculate the lowest gap at the L *** gap center coincides quite well with the measured transmission dip.

关键词： point spheres cubic

Silica Colloidal Crystals with Ethanol Solvent

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Chinese Physics Letters 2000年第2期17卷 112-114页

作者： LI Zhao-Lin NI Pei-Gen cheng bing-ying JIN Chong-Jun ZHANG Dao-Zhong DONG Peng GUO Xing-Cai Optical Physics Laboratory Institute of Physics and Center for Condensed Matter PhysicsChinese Academy of ScienceBeijing 100080 National Heavy Oil Research Laboratory University of PetroleumBeijing 102200

We have prepared a silica colloidal crystal with ethanol, which has a face-centered cubic structure and a corresponding photonic band gap located in the visible region, determined by Kossel ring analysis and the transmission spectra. A special feature is an apparent variation of its lattice constant, as well as the gap frequency, with sample height. The Raman scattering induced by a picosecond laser at different heights of the colloidal crystal has been measured. It is found that the intensity of the Raman scattering is not related sensitively to the photonic gap, even though the Raman-Stokes wavelength is inside the gap.

关键词： spectra crystal colloidal

SUPERFLUORESCENCE CAUSED BY COLLISIONS BETWEEN EXCITED Mg ATOMS

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Chinese Physics Letters 1985年第8期2卷 373-376页

作者： ZHANG Dao-zhong cheng bing-ying JU Rui ZHAO Xiao-kang Institute of Physics Academia SinicaBeijing

when 3s3p(1p)of Mg is resonantly excited by a dye laser,the bright and directional emission at 5184Åcan be *** have measured its intensity and temporal behavior in different Mg *** emission is believed to be the super... 详细信息

关键词： density. excited resonant

A MEASUREMENT ON ENERGY-POOLING COLLISION CROSS SECTION IN Mg

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Chinese Physics Letters 1985年第10期2卷 437-440页

作者： ZHANG Dao-zhong cheng bing-ying JU Rui ZHAO Xiao-kang Institute of Physics Academia SinicaBeijing

The energy-pooling collision cross section for the transfer from 3s3p^(1)P to 3s4s^(3)S of Mg has been determined by measuring the relative intensity of the fluorescence at 5184Åand 2852Å.The average cross section is(3.1±40%)×10^(-15)cm^(2).By considering the influence of radiation trapping and other uncertain effects,the absolute uncertainty of our measurement is within one order of magnitude.

关键词： absolute trapping collision

周期极化LiNbO_3晶体中电极布置对反转畴扩张的影响

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物理学报 2005年第10期54卷 4761-4764页

作者：王霆马博琴盛艳程丙英张道中中国科学院物理研究所北京凝聚态物理国家实验室和中国科学院光物理重点实验室北京100080

利用外加电场极化的方法,分别研究了三种不同方式布置的极化电极对C向切割LiNbO3晶体极化反转畴扩张的影响.实验结果表明在相同极化条件下,当极化电极长度方向与六边形反转畴一对边呈90°和0°角时,极化扩张速度分别为0·089μm/ms和0·... 详细信息

利用外加电场极化的方法,分别研究了三种不同方式布置的极化电极对C向切割LiNbO3晶体极化反转畴扩张的影响.实验结果表明在相同极化条件下,当极化电极长度方向与六边形反转畴一对边呈90°和0°角时,极化扩张速度分别为0·089μm/ms和0·011μm/ms.实验结果揭示,为了有效地控制极化占空比,在制备一维准相位匹配LiNbO3晶体时应避免极化电极与六边形反转畴壁中一对边呈90°的情况.

关键词：周期极化极化扩张准相位匹配 LiNbO3晶体极化反转电极布置扩张影响实验极化电极电场极化

二维平板光子晶体直波导的制备和光传输特性的测量

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物理学报 2005年第12期54卷 5659-5662页

作者：韩守振田洁冯帅任承李志远程丙英张道中中国科学院物理研究所北京100080

利用聚焦离子束刻蚀的方法在SOI(silicon oninsulator)基片上制备了W3型二维光子晶体直波导.观察并测量了近红外激光通过光子晶体波导的散射图形和透过谱.实验结果说明,激光在有引入引出脊形波导的光子晶体直波导中具有很好的传输特性.

关键词：光子晶体波导光子带隙脊型波导