光阱中多个金纳米棒的双光子荧光效应及热熔合过程  

Investigation of the two-photon-absorption induced luminescence and the thermal fusion of multiple gold nanorods in the optical trap

作　　者：邓海东[1] 刘光茵 杨小红[1] 

机构地区：[1]华南农业大学理学院,广州510642 [2]华南师范大学信息光电子科技学院,广州510006

出　　处：《中国科学：物理学、力学、天文学》2014年第7期691-697,共7页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：广东省自然科学基金资助项目(编号:S2012040007719)

摘　　要：本文利用单束、波长对应金纳米棒长轴表面等离子共振的飞秒脉冲激光对多个长度为40 nm,直径为10 nm的金纳米棒颗粒进行了光捕获,系统研究了金纳米棒颗粒在共振激光作用下的双光子荧光及光致热熔合效应.实验结果表明,在光阱捕获过程中金纳米棒颗粒会激发出明显的双光子荧光.当多个金纳米棒被光力捕获在光斑中心时,金纳米棒发生热熔化并熔合成大尺寸的金纳米团簇.利用这种单光束光镊熔合技术,我们在玻璃衬底上制备了二维有序的金纳米团簇阵列.这一研究对利用金纳米棒颗粒来制备微纳光子结构及多功能光子器件等具有重要的指导意义.In this paper, we investigated the optical trapping of multiple gold nanorods by using a focused laser beam at 800 nm which was in resonance with the longitudinal surface plasmon resonance of gold nanorods （40 nm×10 nm）. The two-photon-absorption induced luminescence and the thermal fusion of multiple gold nanorods in the optical trap were systematically studied. It was found that the two-photon-absorption induced luminescence of the trapped gold nanorods was dramatically suppressed and a big sized gold nanocluster was formed on the substrate of the sample cell due to the melting of the gold nanorods trapped in the optical trap. A two dimensional gold nanocluster array could be conveniently assembled on a coverslip by using this method. The technique could be employed for fabrication of micro- or nanostructures and various functional optical devices.

关 键 词：光捕获 金纳米棒 表面等离子共振 双光子荧光 

分 类 号：TB383.1[一般工业技术—材料科学与工程]