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Au/ITO dual-layer-coated optical fiber probe for multifunctional scanning tunneling microscopy

机译:用于多功能扫描隧道显微镜的Au / ITO双层涂层光纤探头

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摘要

We have fabricated an Au/ITO (indium-tin-oxide) dual-layer optical fiber probe with functions for high-quality scanning tunneling microscope (STM) imaging and near-field excitation and detection of STM-induced electroluminescence (STML). The inner ITO layer is kept similar to 150 nm in thickness to ensure the conductivity of the fiber probe. The outer Au layer is kept similar to 13 nm in thickness to obtain a better combination of high electron injection efficiency and optical transparency. High-quality STM images, and STML corresponding to maximum quantum efficiencies of 7 x 10(-4) and 1 x 10(-4) photons/electron are obtained on Au(111)/mica and p-GaAs(110) surfaces at room temperature (RT), respectively. The outer Au layer on the Au/ITO-coated fiber probe shows an effective role in improving the quality of STM imaging, the tip apex geometry and durability of the fiber probe, the stability and reproducibility of STML and enhancing the intensity of plasmon-mediated STML from the Au(111) surface but it shows no effect in enhancing the intensity of STML from the GaAs(110) surface.
机译:我们已经制造了一个Au / ITO(铟锡氧化物)双层光纤探针,该探针具有高质量的扫描隧道显微镜(STM)成像以及近场激发和STM诱导电致发光(STML)检测的功能。内部ITO层的厚度保持接近150 nm,以确保光纤探针的导电性。外金层的厚度保持接近13 nm,以获得高电子注入效率和光学透明性的更好组合。在Au(111)/云母和p-GaAs(110)表面上可获得高质量的STM图像以及对应于7 x 10(-4)和1 x 10(-4)光子/电子的最大量子效率的STML。室温(RT)。 Au / ITO涂层光纤探头上的外层Au层在改善STM成像质量,光纤探头的尖端顶点几何形状和耐用性,STML的稳定性和可重复性以及增强等离激元介导的强度方面显示出有效的作用Au(111)表面的STML,但对GaAs(110)表面的STML的强度没有影响。

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