排序方式: 共有17条查询结果,搜索用时 31 毫秒
1.
INVESTIGATION OF GROWTH CHARACTERISTICS OF MONOCRYSTALLINE C60 FILMS IN HELIUM GAS ENVIRONMENT 下载免费PDF全文
The growth characteristics of C60 films were investigated in helium gas environment at pressures of 0, 2.667×10-2 and 6.667×10-2 Pa, respectively. X-ray diffraction results showed that perfectly (111) oriented monocrystalline C60 films with large grains were successfully deposited on synthetic 1M phlogopite mica-fluorophlogopite (0Ol) plane at a substrate temperature of 160℃ when the helium gas pressure is 2.667×10-2 Pa. The results indicated that under appropriate helium gas pressure, the energy change of C60 molecules through collisions with helium atoms, and the decrease of the supersaturation of the vapor pressure in the vicinity of the substrate resulted in a quasi-thermodynamic equilibrium deposition system. As a result, well-structured monocrystalline C60 films were deposited on (001) plane of the fluorophlogopite substrate. 相似文献
2.
基于模式/模群复用的多模光纤通信系统是目前光通信领域的研究热点。系统中存在多个模式/模群,如何准确识别它们是提升传输系统性能的关键问题之一。提出了一种基于深度学习的多模光纤模式与模群的智能识别模型,通过引入全卷积神经网络(CNN),对噪声影响情况下线偏振模式及其模群进行仿真和实验研究。首先,基于多平面光转换模式复用器件和普通OM2多模光纤,搭建10个模式(LP01、LP11a/b、LP21a/b、LP02、LP12a/b、LP31a/b)及其对应的3个模群的光场信息获取的仿真和实验平台,利用大量数据进行训练和验证。实验结果显示,模式/模群的总体识别率可达到100%。通过将获取的模群光场图片重构为低分辨率图片,研究低密度光电探测器阵列接收条件下,智能识别模型的识别性能。实验结果显示,采取4×4光探测器阵列接收光场信息时,能获得98.3%的识别效率。本研究表明提出的智能识别模型具有良好的光纤模式/模群智能识别能力,其在多模光纤通信系统性能提升与智能光性能监测方面具有一定的应用潜力。 相似文献
3.
我们应用胶体化学合成方法制备出具有核壳结构的CdSe/HgSe/CdSe量子点量子阱(QDQW)纳米晶,由于QDQW中载流子的量子限制效应,其光致发光谱(PL)出现了明显的蓝移现象,谱峰也有明显增强。本文中,我们通过对CdSe/HgSe/CdSe量子点量子阱核壳结构进行HREM的研究,并对包裹层这种异质外延生长及PL谱进行分析,获得了有意义的结论。胶体CdSe纳米晶是在水溶液中加以生长[1]。其化学反应式为:Cd2++2OH-+SeSO32-→CdSe+SO32-+H2O(1)通过改变Cd2+、SeSO32-的浓度及溶液中pH值,对CdSe纳米晶的尺度加以控制,并加入化学稳定剂阻止CdSe纳… 相似文献
4.
5.
6.
自从 1987年E .Yablonuitch和John提出光子带隙 (PBG)的概念以来 ,有关光子晶体的研究令众多理论物理学家和实验物理学家产生了广泛兴趣。迄今为止 ,人们利用微加工技术制备了一维、二维、甚至三维的微波波段的光子晶体。然而 ,随着研究的深入 ,尺寸要求越来越小 ,这种自上而下的制备方法遇到的困难也越大 ,尤其是在制备可见光波段的三维光子晶体时 ,微加工技术制备已经难以完成 ,人们开始把目光投向由下而上的胶体化学方法。通常 ,自然界最常见的和人工合成的光子晶体是由SiO2亚微米小球自组织而成的 ,即蛋白石[1] … 相似文献
7.
8.
9.
全息体视图(HS)是一种可加速计算的全息图,能够实现单色全息三维(3D)显示,将其与彩色彩虹全息相结合并实现允许多人围观的半周视彩色彩虹全息3D显示具有实际应用价值。在HS计算原理的基础上,设计单元全息图侧视角及视场角等参数,通过频域复用获得包含红色、绿色和蓝色信息的单元全息图的频谱,对频谱进行傅里叶逆变换后取实部得到该单元全息图,所有单元全息图的组合形成完整的半周视彩色彩虹HS。通过并行加速计算的方法实现分辨率为200800 pixel×200800 pixel、尺寸为64 mm×64 mm的高分辨率半周视彩色彩虹HS仅需15.15 min。采用反射照明的方式进行光学再现,实现了允许多人同时观看的清晰的彩色全息3D显示,其有望应用于3D军事地图、3D沙盘等领域。 相似文献
10.
INVESTIGATION OF GROWTH CHARACTERISTICS OF MONOCRYSTALLINE C60 FILMS IN HELIUM GAS ENVIRONMENT 下载免费PDF全文
The growth characteristics of C60 films were investigated in helium gas environment at pressures of 0, 2.667×10-2 and 6.667×10-2 Pa, respectively. X-ray diffraction results showed that perfectly (111) oriented monocrystalline C60 films with large grains were successfully deposited on synthetic 1M phlogopite mica-fluorophlogopite (0Ol) plane at a substrate temperature of 160℃ when the helium gas pressure is 2.667×10-2 Pa. The results indicated that under appropriate helium gas pressure, the energy change of C60 molecules through collisions with helium atoms, and the decrease of the supersaturation of the vapor pressure in the vicinity of the substrate resulted in a quasi-thermodynamic equilibrium deposition system. As a result, well-structured monocrystalline C60 films were deposited on (001) plane of the fluorophlogopite substrate. 相似文献