用扫描近场光学显微镜技术研究金膜表面等离体子共振  

Research of Surface Plasmon Resonance on Gold Film Using Scanning Near-Field Optical Microscopy

作　　者：郑建亚[1] 于晓明[2] 张天浩[1,2] 方哲宇[2] 杨海东[2] 尹美荣[2] 贾峰[2] 康慧珍[2] 路彦珍[3] 杨大鹏[2] 杨嘉[2] 满江伟[2] 

机构地区：[1]南开大学物理科学学院实验中心,天津300071 [2]南开大学物理科学学院光子学中心弱光非线性光子学材料先进技术及设备教育部实验室,天津市信息光子材料与技术重点实验室,天津300071 [3]石家庄机械化步兵学院文化教研室,石家庄050083

出　　处：《光学学报》2006年第8期1236-1239,共4页Acta Optica Sinica

基　　金：国家自然科学基金(60208002);南开大学本科生科技创新项目;长江学者及创新团队发展计划资助课题

摘　　要：表面等离体子波(SPW)可与入射光横磁波极化能量耦合并被共振激发,这种现象被称为表面等离体子共振现象(SPR)。主要利用扫描近场光学显微镜(SNOM)技术和表面等离体子共振现象技术相结合,来研究金膜表面等离体子共振。设计并建立了结构独特的新型Kretschmann型表面等离体子共振现象耦合装置,同时又设计了具有厚度梯度的表面等离体子的制备方法。在此基础上,测量了改变入射角条件下的表面等离体子共振曲线,测得该装置的等离体子共振角灵敏度为1°。并且对金膜表面进行表面等离体子共振条件下的扫描近场光学显微成像。实验结果表明,在共振时金膜表面的扫描成像比不共振时清晰,而且增加了很多细节。应用表面等离体子共振现象技术将可以明显提高扫描近场光学显微镜的信噪比、分辨力等性能。Surface plasmon resonance （SPR） is a phenomenon induced by the polarizing energy coupling and resonant exciting of surface plasmon wave and incident TM light wave. The SPR on gold film is studied with combination of scanning near-field optical microscope （SNOM） and SPR technique. A novel Kretschmann type of SPR coupling device with special structure is designed and set up, and the fabrication method of surface plasmon with thickness gradient is presented. Based on the above preparation, the curve of SPR is measured with varied incident angle conditions, and the angle sensitivity for SPR is 1°. The image of gold film surface is obtained with SNOM under PSR conditions, and it is found that the image is clearer under SPR condition than that without SPR and more details are distinguished. The performances, such as signal-noise ratio and resolution, for SNOM are greatly improved with the SPR technique.

关 键 词：近场光学 表面等离体子波 表面等离体子共振 扫描近场光学显微镜 克里施曼配置 

分 类 号：TH742[机械工程—光学工程]