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大口径多孔透镜离轴成像研究 被引量:3
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作者 高仲 马君显 +3 位作者 周崇喜 罗先刚 杜春雷 王长涛 《光电工程》 EI CAS CSCD 北大核心 2007年第9期25-29,共5页
设计并采用微细加工技术制作了直径D=50mm,特征尺寸为10μm的大口径多孔透镜(photon sieve)。在一定的视场下采用数值计算和实验方法分析了其聚焦特性和MTF曲线,为克服多孔透镜一级衍射效率较低,成像质量受背景光干扰的影响,采用了同轴... 设计并采用微细加工技术制作了直径D=50mm,特征尺寸为10μm的大口径多孔透镜(photon sieve)。在一定的视场下采用数值计算和实验方法分析了其聚焦特性和MTF曲线,为克服多孔透镜一级衍射效率较低,成像质量受背景光干扰的影响,采用了同轴和离轴成像实验。实验结果与聚焦特性一致,两种实验方法得出的不同实验结果表明:离轴成像系统效果克服了同轴成像受0级背景光的影响,改善了像质,为很多一级衍射效率较低的衍射透镜成像提供一种新的成像方式。 展开更多
关键词 多孔透镜 大口径透镜 离轴成像 聚焦特性
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多孔硅波导透镜的实验研究(英文)
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作者 贾振红 《新疆大学学报(自然科学版)》 CAS 2003年第4期371-373,共3页
给出了利用选择性的电化学腐蚀过程制备氧化多孔硅光波导棱镜的方法,分别制备出基于多孔硅的汇聚和发散透镜.这类波导棱镜可以明显地汇聚和发散波导中传输的偏振光束.
关键词 多孔硅波导透镜 电化学腐蚀 光波导棱镜 汇聚透镜 发散透镜 偏振光 光学实验
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衍射光学元件在无掩模光刻中的应用 被引量:4
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作者 佟军民 胡松 +1 位作者 李爱敏 谢常青 《微细加工技术》 EI 2006年第5期18-23,共6页
描述了波带片/多孔透镜阵列无掩模光刻方法,着重介绍了波带片的几何结构特点和衍射聚焦特性,研究了影响光刻分辨率的因素和使用位相型波带片代替振幅型波带片提高衍射效率的设计方法,讨论了高级衍射焦点对波带片的光刻对比度的影响及消... 描述了波带片/多孔透镜阵列无掩模光刻方法,着重介绍了波带片的几何结构特点和衍射聚焦特性,研究了影响光刻分辨率的因素和使用位相型波带片代替振幅型波带片提高衍射效率的设计方法,讨论了高级衍射焦点对波带片的光刻对比度的影响及消除措施,表明了波带片光刻有光刻对比度和高光刻分辨率受限于最小结构尺寸两个技术难点。对比介绍了多孔透镜的结构和衍射聚焦原理,论述了利用多孔透镜抑制高级衍射焦点和焦平面上次级大的特性,可以提高光刻对比度、提高光刻分辨率、克服波带片受限于最小结构尺寸的缺点。 展开更多
关键词 无掩模光刻 波带片 多孔透镜 分辨率 光刻对比度
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Supercritical Fluid Extraction of a Novel Template from Mesoporous Zirconia and the Effect on Porous Structure 被引量:4
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作者 MA Fu ZHAO Hongjian 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2013年第6期698-700,共3页
Mesoporous zirconia was synthesized by a new and simple method. Zirconium n-propoxide was used as the zirconium source. A small, inexpensive nonsurfactant, triethanolamine, was used as the template. The template was r... Mesoporous zirconia was synthesized by a new and simple method. Zirconium n-propoxide was used as the zirconium source. A small, inexpensive nonsurfactant, triethanolamine, was used as the template. The template was removed by thermal treatment in air and supercritical fluid extraction using CO2. The structure of the resulting materials was characterized by X-ray diffraction, transmission electron microscopy, and N2 adsorption-desorption analyses. The materials are found to have narrowly distributed average pore diameters and wormhole-like pore channels. However, higher surface area and larger pore volume are exhibited after supercritical fluid extraction with CO2. The removal of the template by thermal treatment also leads to condensation and mild shrinkage of the zirconia framework. 展开更多
关键词 mesoporous zirconia TRIETHANOLAMINE STRUCTURE CALCINATION supercritical fluid extraction
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Porous CuO nanowires as the anode of rechargeable Na-ion batteries 被引量:22
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作者 Lijiang Wang Kai Zhang Zhe Hu Wenchao Duan Fangyi Cheng Jun Chen 《Nano Research》 SCIE EI CAS CSCD 2014年第2期199-208,共10页
We report the preparation of porous CuO nanowires that are composed of nanoparticles (-50 nm) via a simple decomposition of a Cu(OH)2 precursor and their application as the anode materials of rechargeable Na-ion b... We report the preparation of porous CuO nanowires that are composed of nanoparticles (-50 nm) via a simple decomposition of a Cu(OH)2 precursor and their application as the anode materials of rechargeable Na-ion batteries. The as-prepared porous CuO nanowires exhibit a Brunauer-Emmett-Teller (BET) surface area of 13.05 m^2.g^-1, which is six times larger than that of bulk CuO (2.16 m^2.g^-1). The anode of porous CuO nanowires showed discharge capacities of 640 mA.h.g^-1 in the first cycle and 303 mA.h.g^-1 after 50 cycles at 50 mA.g^-1 The high capacity is attributed to porous nanostructure which facilitates fast Na-intercalation kinetics. The mechanism of electrochemical Na-storage based on conversion reactions has been studied through cyclic voltammetry, X-ray diffraction (XRD), Raman spectroscopy, and high resolution transmission electron microscopy (HRTEM). It is demonstrated that in the discharge process, Na+ions first insert into CuO to form a CuⅡ1-x CuⅠ x O1-x/2solid and a Na2O matrix then CuⅡ1-xCu Ⅰ xO1-x/2 reacts with Na+ to produce Cu2O, and finally Cu2O decompose into Cu nanoparticles enclosed in a Na2O matrix. During the charge process, Cu nanopartides are first oxidized to generate Cu2O and then converted back to CuO. This result contributes to the design and mechanistic analysis of high-performance anodes for rechargeable Na-ion batteries. 展开更多
关键词 porous CuO nanowires anode materialelectrochemicalconversion reactions Na-ion batteries
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