PSTM中不同探针扫描成像的模拟分析  

Numerical simulation of PSTM with different optical fiber probe

作　　者：简国树[1] 代云丽[1] 李岩[1] 潘石[1] 

机构地区：[1]大连理工大学物理系,辽宁大连116024

出　　处：《光电工程》2006年第2期37-40,共4页Opto-Electronic Engineering

基　　金：国家自然科学基金项目(30270367);教育部博士点基金资助(2002141018)

摘　　要：金属纳米粒子或薄膜在可见光的激励下产生表面增强效应。尝试在光子扫描隧道显微镜(PSTM)中应用带铝的光纤探针来提高成像的分辨率和灵敏度。采用二维时域有限差分法(FDTD)模拟计算了裸光纤、尖端镀铝颗粒光纤、孔径镀铝膜光纤和全镀铝膜光纤探针的成像。结果显示,采用带铝探针后的灵敏度均比裸光纤提高两个数量级;尖端镀铝颗粒光纤探针的分辨率最好,可优于20nm;全镀铝膜和孔径镀铝膜光纤探针的分辨率分别可达到20nm和60nm。结果可供探针制备及实验参数设置参考。Stimulated by visible light, metal nano-particle or nano-film could produce surface field enhancement. Fiber probe with Al-coated was applied to Photon Scanning Tunneling Microscope （PSTM） for improving the resolution and sensitivity. In this paper, using Finite Difference Time Domain （FDTD）method, bare fiber probe, fiber probe with aluminum particle, AI-coated aperture fiber probe and total AI-coated fiber probe were analyzed. The result shows that： the sensitivity of fiber probe with AI-coated can be improved one hundred times compared with bare fiber probe; the resolution of fiber probe tip with AI particle is superior to twenty nanometers; the resolutions of total AI-coated fiber probe and AI-coated aperture fiber probe are 20nm and 60nm respectively. These conclusions could be a reference for parameter setting of fiber probe facture.

关 键 词：光子扫描隧道显微镜(PSTM) 时域有限差分(FDTD)法 分辨率 灵敏度 

分 类 号：TH742[机械工程—光学工程]