Theory of Visible Light Emission from Scanning Tunneling Microscope

Japanese Journal of Applied Physics - Tập 31 Số 8R - Trang 2465 - 1992
Y. Uehara1, Yuichi Kimura1, Sukekatsu Ushioda Takeuchi1
1Research Institute of Electrical Communication, Tohoku University, Sendai 980

Tóm tắt

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.

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Thông tin
Thông tin xuất bản

Japanese Journal of Applied Physics

Tập 31 Số 8R

2465

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