STM隧道结中等离子体激元激发过程的能量传递通道
Energy transfer channels of the plasmon excitation process in STM tunnel junctions
摘要：
我们研究了扫描隧道显微镜针尖和金属衬底之间的间隙等离子体激元的衰减，激发的非弹性隧穿电子。隧穿电子的激发能量分为电阻耗散和电磁辐射两大类，它们又可以进一步分为四个不同的通道，包括针尖上的SPP通道、衬底上的SPP通道、空气模式通道和直接猝灭通道。我们发现，大部分的激发能量去表面等离子体激元的金属STM针尖，而不是在基板上。尖端直接淬火也占相当大的比例，特别是在高频区。
英文摘要：
We study the decay of gap plasmons localized between a scanning tunneling microscope tip and metal substrate, excited by inelastic tunneling electrons. The overall excited energy from the tunneling electrons is divided into two categories in the form of resistive dissipation and electromagnetic radiation, which together can further be separated into four different channels, including SPP channel on the tip, SPP channel on the substrate, air mode channel and direct quenching channel. We find that most of the excited energy goes to surface plasmon polaritons on the metallic STM tip, rather than that on the substrate. The direct quenching in the apex of tip also takes a considerable portion especially in high frequency region.
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