Theory of Visible Light Emission from Scanning Tunneling Microscope

Theory of Visible Light Emission from Scanning Tunneling Microscope
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扫描隧道显微镜可见光发射理论

DOI：
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发表时间：
1992
期刊：
影响因子：
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通讯作者：
Sukekatsu Ushioda Takeuchi
Sukekatsu Ushioda Takeuchi
中科院分区：
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文献类型：
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作者：
Y. Uehara;Y. Kimura;Sukekatsu Ushioda Takeuchi

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采用发光隧道结理论，从理论上研究了扫描隧道显微镜（STM）可见光发射的机理。通过对计算结果和现有实验数据的分析，出现了以下情况。隧穿电流首先激发局部表面等离子体激元（LSP），其局部化在STM尖端前端和样品表面之间的几十埃的区域中。它们中的一些衰减为表面等离子体激元（SPP），其沿样品表面沿着传播。光发射有两个通道：一个是从LSP直接发射，另一个是通过SPP发射。这两个通道之间的相对分支比取决于实验配置。样品表面粗糙度的影响非常小，可以忽略不计。
The mechanism for visible light emission from the scanning tunneling microscope (STM) has been investigated theoretically by adapting a theory for light emitting tunnel junctions (LETJ). From the analysis of the calculated results and available experimental data, the following picture emerges. The tunneling current first excites localized surface plasmons (LSP) that are localized in a region of a few tens of Angstroms between the STM tip-front and the sample surface. Some of them decay into surface plasmon polaritons (SPP) that propagate along the sample surface. There are two channels of light emission: one is direct emission from LSP and the other is emission through SPP. The relative branching ratio between these two channels depends on the experimental configuration. The effect of sample surface roughness is very small and negligible.