NSOM和TSM中探针-样品间剪切力作用机制的研究  

Mechanism for Shear-force Between Tip and Sample in NSOM and TSM

作　　者：张天浩[1] 方哲宇[1] 吴雪[1] 高立模[1] 郑建亚[1] 贾峰[1] 杨海东[1] 尹美荣[1] 颜彩繁[1] 

机构地区：[1]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

出　　处：《光电子．激光》2006年第8期914-917,共4页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金资助项目(60208002)

摘　　要：利用粘有光纤探针的石英调谐音叉,可实现近场扫描光学显微镜(NSOM)和调谐音叉剪切力显微镜(TSM)光纤探针尖端与样品(T-S)间距离的控制。研究了石英调谐音叉控制T-S间剪切力作用的机制,建立了音叉T-S系统的振动方程,理论分析了音叉电流I和T-S间距d的关系,建立了T-S间剪切力作用机制模型。实验测量了不同环境和不同样品下的I-d曲线,实验结果与理论分析相吻合。揭示了nm尺度下,由于毛细凝聚作用在T-S间耦合的H2O和C-H化合物分子所形成的粘滞阻尼是导致T-S间剪切力作用的主要原因。The distance between tip and sample（T-S） can be regulated using piezo-electric quartz fork glued with micro optic fiber probe. The principle of this technology is studied. The biquadrate vibration equation for fork-probe-sample system is established, the relations between the electric current of the fork and T-S distance （I-d curves） are analysed theoretically,and the mechanism model of the shear force between the optic fiber probe and the sample is established. In this work the I-d curves of various samples under various conditions are measured. The results accord with the theoretical analyses very well. Furthermore,the intrinsic reasons for shear force damping between T-S have been revealed i. e. the water and hydrocarbon coupled between optic fiber probe and sample due to the capillary cohesion force.

关 键 词：近场光学扫描探针显微镜(NSOM) 调谐音叉剪切力显微镜(TSM) 剪切力 石英调谐音叉 

分 类 号：TH741.7[机械工程—光学工程]