基于单个金纳米棒的表面等离子体共振增强单个纳米晶上转换发光  

Surface-Plasmon Resonance-Enhanced Upconversion Luminescence of Single Nanocrystal Based on Single Gold Nanorod

作　　者：薛映仙 戎有英 马强[1] 潘诚达 陈凌霄[1] 武愕[1] 吴伯涛[1] 

机构地区：[1]华东师范大学精密光谱科学与技术国家重点实验室,上海200062

出　　处：《光学学报》2017年第7期256-261,共6页Acta Optica Sinica

基　　金：国家自然科学基金(11674099);国家自然科学基金重大仪器设备研究专项(61227902);上海市自然科学基金(16ZR1409400)

摘　　要：稀土离子掺杂上转换纳米晶在生物成像和光伏领域具有广泛的应用前景,但其较低的上转换效率限制了其应用。利用原子力显微镜探针在纳米尺度下操控单个金纳米棒与单个上转换纳米晶耦合,通过单颗粒光谱学研究了金纳米棒局域表面等离子体共振对纳米晶上转换发光的影响。结果表明纳米晶上转换发光强度对激发光的偏振方向具有强烈的依赖性。当激发光偏振方向平行于金纳米棒长轴时,纳米晶的绿色和红色上转换发光可以分别获得最大增强倍数为18和40的发光增强。Rare-earth ion doped upconversion nanocrystals show wide applications in bioimaging and photovoltaics.However,its low upconversion efficiency limits their applications.The single Au nanorod and single upconversion nanocrystal are coupled in nanometer scale with an atomic force microscope probe manipulation.The effect of localized surface plasmon resonance of Au nanorod on the nanocrystal′s upconversion luminescence is studied by single-particle spectroscopy.Results show that the upconversion luminescence intensity of nanocrystal shows strong dependence on the laser polarization direction.When the laser polarization is parallel to the long axis of Au nanorod,the maximum enhancement folds of 18 and 40 are obtained for the green and red upconversion luminescence of nanocrystal.

关 键 词：表面光学 上转换发光 局域表面等离子体共振 金纳米棒 发光增强 

分 类 号：O433[机械工程—光学工程]