Theoretical study of photon emission from single quantum dot emitter coupled to surface plasmons

Motivated by the recent pioneering advances on nanoscale plasmonics and also nanophotonics technology based on the surface plasmons (SPs), in this work, we give a master equation model in the Lindblad form and investigate the quantum optical properties of single quantum dot (QD) emitter coupled to the SPs of a metallic nanowire. Our main results demonstrate the QD luminescence results of photon emission show three distinctive regimes depending on the distance between QD and metallic nanowire, which elucidates a crossover passing from being metallic dissipative for much smaller emitter-nanowire distances to surface plasmon (SP) emission for larger separations at the vicinity of plasmonic metallic nanowire. Besides, our results also indicate that, for both the resonant case and the detuning case, through measuring QD emitter luminescence spectra and second-order correlation functions, the information about the QD emitter coupling to the SPs of the dissipative metallic nanowire can be extracted. This theoretical study will serve as an introduction to understanding the nanoplasmonic imaging spectroscopy and pave a new way to realize the quantum information devices.     

AlN纳米线宏观阵列的制备

借助二次模板法成功的合成了AlN纳米线宏观阵列,并进行了表征.主要研究CVD法制备有一定取向,直径均匀的AlN纳米线宏观阵列的过程.通过气相沉积法和利用PS球自组装模板制备了金属纳米颗粒模板;再以模板上的金属纳米颗粒作为催化剂,利用化学气相沉积在模板上合成AlN纳米线宏观阵列.借助SEM,TEM观察所得样品,AlN纳米线阵列面积约为0.3 mm×0.2 mm,直径和长度分布均匀,平均直径约为41 nm,平均长度为1.8 μm左右,分散密度和覆盖率大的六角结构AlN纳米线宏观阵列.得到了可控制备AlN纳米线 关键词： AlN纳米线阵列 模板法 CVD法 SEM     

超导纳米线单光子探测器

利用磁控溅射、电子束光刻和反应离子刻蚀等微加工技术,开展了超导纳米线单光子探测器(SNSPD)的研究.通过对SNSPD的设计和制备工艺参数的优化,成功制备出了高质量的SNSPD.单光子检测实验表明,制备的SNSPD对660 nm波长的光信号,系统检测效率可达30%,对1550 nm波长光信号,最大系统检测效率为4.2%.在平均暗计数小于10 c/s的情况下,系统检测效率大于20%(660 nm)和3%(1550 nm). 关键词： 单光子 氮化铌 纳米线 探测器     

具有横向磁晶各向异性的钴纳米线的微波吸收性能

使用电化学脉冲沉积法制备了磁晶各向异性易磁化方向(c轴)垂直纳米线长轴方向的钴纳米线.受到磁晶各向异性、静磁相互作用等因素与形状各向异性相互竞争的结果,纳米线阵列的磁滞回线显示出较弱的磁各向异性.此外,在2—18 GHz频率范围内,纳米线/石蜡复合材料的介电色散谱的虚部在5 GHz处有一个主峰,在10 GHz附近有一个较弱的峰;德拜弛豫特性和材料的电导率对这两个峰的形成均有贡献.同时,其磁导率色散谱的虚部在频率为6.1 GHz处有一个主峰,在10 GHz以上有两个较微弱的峰. 前一个峰源于自 关键词： 钴纳米线 介电色散谱 磁导率色散谱 微波吸收剂     

GISAXS and SAXS studies on the spatial structures of Co nanowire arrays

The spatial structures of magnetic Co nanowire array embedded in anodic aluminium membranes were investigated by grazing incidence small angle X-ray scattering (GISAXS) and conventional small angle X-ray scattering (SAXS) techniques. Compared with SEM observation, the GISAXS and SAXS measurements can get more overall structural information in a large-area scale. In this study, the two-dimensional GISAXS pattern was well reconstructed by using the IsGISAXS program. The results demonstrate that the hexagonal lattice formed by the Co nanowires is distorted (a ≈ 105 nm, b ≈ 95 nm). These Co nanowires are isolated into many structure domains with different orientations with a size of about 2 μm. The SAXS results have also confirmed that the nanopore structures in the AAM can be retained after depositing Co nanowires although the Co nanowires can not completely but only just fill up the nanopores. These results are helpful for understanding the global structure of the Co nanowire array.     

ZnO纳米线的制备

利用磁控溅射技术在Si衬底上沉积的锌膜进行热氧化后,得到一维ZnO纳米线。     

ZnO纳米线微腔中的回音壁模激子极化激元及其激射

本刊讯 来自中国科学院上海技术物理研究所的沈学础院士做客第二十一期武汉光电论坛，作了题为ZnO纳米线微腔中的回音壁模激子极化激元及其激射——物理和应用前景的报告。     

Ni纳米线的结构和性质研究

采用推广模拟退火算法(Generalized Simulated Annealing,GSA)和Sutton-Chen势,研究了初始构型为面心立方(fcc)结构的Ni纳米线,在沿径向压缩时的结构和性质.结果表明:径向压缩程度对Ni纳米线的结构有很大的影响.当Ni纳米线直径大于0.398nm时(初始直径为0.498nm),其结构由fcc结构变为类似fcc结构,但结合能变化很小,表明其结构之间几乎可以实现零能量转换,且稳定性基本不变;当Ni纳米线直径小于0.398nm时,其结构从无定形结构变为缺陷结构,结合能迅速上升,表明其结构稳定性降低;键角的分布也证明了以上结果的正确性.