期刊
JOURNAL OF CHEMICAL PHYSICS
卷 138, 期 15, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4800965
关键词
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资金
- NSF [DGE-0808392]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [0802913] Funding Source: National Science Foundation
We demonstrate ultrafast laser driven nonlinear scanning tunneling microscopy (STM), under ambient conditions. The design is an adaptation of the recently introduced cross-polarized double beat method, whereby z-polarized phase modulated fields are tightly focused at a tunneling junction consisting of a sharp tungsten tip and an optically transparent gold film as substrate. We demonstrate the prerequisites for ultrafast time-resolved STM through an operative mechanism of nonlinear laser field-driven tunneling. The spatial resolution of the nonlinear laser driven STM is determined by the local field intensity. Resolution of 0.3 nm-10 nm is demonstrated for the intensity dependent, exponential tunneling range. The demonstration is carried out on a junction consisting of tungsten tip and gold substrate. Nano-structured gold is used for imaging purposes, to highlight junction plasmon controlled tunneling in the conductivity limit. (C) 2013 AIP Publishing LLC. [http://dx.doi.org/10.1063/1.4800965]
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