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国家自然科学基金(s90606023)

作品数:4 被引量:12H指数:2
相关作者:俞大鹏王朋伟章新政单旭东张洋更多>>
相关机构:北京大学更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划更多>>
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金属表面微纳米光滑构造的新方法
2009年
传统的曝光技术等平面工艺通常只能获得边缘陡峭的平面结构。通过多层曝光、灰度曝光、聚焦离子束加工等方法可以实现高度渐变的准三维结构的构造,却往往难以获得良好的光滑度。本文结合电子束曝光技术、PMMA结构平滑技术、模板剥离技术,实现了多种多样的渐变结构的构造。这种技术具有构造方法简单、表面粗糙度小、可自由定位等众多优点。
张洋朱新利廖志敏俞大鹏
关键词:金属电子束曝光
Surface Exciton-Plasmon Polariton Enhanced Light Emission via Integration of Single Semiconductor Nanowires with Metal Nanostructures被引量:2
2009年
The light emission enhancement behavior from single ZnO nanowires integrated with metallic contacts is investigated by micro-photoluminescence measurements.Apart from surface plasmon polaritons at the air/metal interface,the emission of a single ZnO nanowire can be coupled into guided modes of surface exciton-plasmon polaritons(SEPPs).The out-coupling avenues of SEPP guided modes are modeled in the presence of nanostructures,such as corrugation and gratings,on the metal surface.The guided modes of SEPPs in metal-contacted ZnO nanowires are calculated using the effective index method.The enhanced light emission from single semiconductor nanowires shows promise for use in highly efficient nano-emitters and nano-lasers,as well as macroscopic solid state light sources with very high efficiency.
Xuejin ZhangPengwei WangXinzheng ZhangJun XuYongyuan ZhuDapeng Yu
关键词:GRATINGS
Tapered dielectric structure in metal as a wavelength-selective surface plasmon polariton focuser
2009年
Symmetric tapered dielectric structures in metal have demonstrated applications such as the nanofocusing of surface plasmon polaritons, as well as the waveguiding of V-channel polaritons. Yet the fabrication of smooth-surfaced tapered structure remains an obstacle to most researchers. We have successfully developed a handy method to fabricate metal-sandwiched tapered nanostructures simply with electron beam lithography. Though these structures are slightly different from conventional symmetric V-shaped structures, systematic simulations show that similar functionality of surface plasmon polariton nanofocusing can still be achieved. When parameters are properly selected, wavelength- selective nanofocusing of surface plasmon polaritons can be obtained.
张洋赵清廖志敏俞大鹏
关键词:FOCUSING
SnO2掺Ag纳米线的制备、结构表征及光学性质研究被引量:10
2008年
用化学气相沉积法在管式炉中制备了SnO2掺Ag纳米线。纳米线直径约50 nm,长几十微米。通过XRD、TEM和Raman谱仪等测量确定SnO2掺Ag纳米线为金红石型结构,XPS谱表明样品中含有Sn、O和Ag元素,Ag的浓度约为1.8 at.%,室温PL谱显示样品在626nm处有很强的红光发射峰。
王朋伟单旭东章新政俞大鹏
关键词:掺杂发光
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