具有金纳米小球覆盖的超导纳米线条的Ⅰ～Ⅴ特性  

THE Ⅰ～Ⅴ CHARACTERISTICS OF SUPERCONDUCTING NANOWIRES COVERED BY Au NANOPARTICLES

作　　者：丁丽华[1] 郑帆[1] 郏涛[1] 金飚兵[1] 

机构地区：[1]南京大学超导电子学研究所,电子与科学工程学院,南京210093

出　　处：《低温物理学报》2015年第1期41-45,共5页Low Temperature Physical Letters

基　　金：国家重点基础研究发展计划(批准号:2011CBA00107);国家自然科学基金(批准号:61371035)资助课题~~

摘　　要：我们利用电磁场仿真软件CST分别对单个金纳米小球,单层纳米球和双层纳米球阵列在可见光波段的光吸收特性进行了仿真,所得结果与参考文献中实验数据一致,证明了方法的正确性.在此基础上对仿真结果进行了定性的分析,给出了影响纳米球等离激元谐振波长和吸收效率的因素.最后,我们将金纳米小球应用到超导单光子探测器中,测量了有金纳米颗粒和无金纳米颗粒时超导纳米线临界电流的变化,观察到金纳米颗粒表面等离激元共振引起的临界电流的大幅度变化,结合仿真,对实验测量结果给出了合理的解释.We simulate the absorbance of single Au nanoparticle, single-layer and double-layer Au nanoparticles in the visible light range by COMPUTER SIMULATION TECHNOLOGY（CST）. The simulation results agree with experimental results, which demonstrate the validity of our model used in CST. Then, we discuss the influences of several factors, such as the size of Au nanoparticle, the distance between nanoparticles and the dielectric constant of coating materials, on the absorbance and the wavelength of surface plasmon resonance. Finally, we apply Au nanoparticles in superconducting nanowire single photon detectors and observe a substantial change of the critical current caused by surface plasmon resonance of Au nanoparticles. We give a reasonable explanation to our experiment.

关 键 词：纳米小球 表面等离激元共振 

分 类 号：TB383.1[一般工业技术—材料科学与工程]