【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。更多还原

【Abstract】 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,Al-coated aperture fiber probe and total Al-coated fiber probe were analyzed. The result shows that: the sensitivity of fiber probe with Al-coated can be improved one hundred times compared with bare fiber probe; the resolution of fiber probe tip with Al particle is superior to twenty nanometers; the resolutions of total Al-coated fiber probe and Al-coated aperture fiber probe are 20nm and 60nm respectively. These conclusions could be a reference for parameter setting of fiber probe facture.更多还原