期刊
NANO LETTERS
卷 9, 期 4, 页码 1451-1456出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl803298q
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资金
- Wellcome Fund Career Award at the Scientific Interface
- National Research Council Research Associateship
- Optical Science and Engineering Program NSF-IGERT
- National Physical Science Consortium Fellowship
- PI Nanolnnovation
- NIH Molecular Biophysics Training Scholarship [T32GM-065103]
- Burroughs Wellcome Fund Career Award in the Biomedical Sciences
- National Science Foundation [0404286, Phy-1551010]
- NIST
Instrumental drift in atomic force microscopy (AFM) remains a critical, largely unaddressed issue that limits tip-sample stability, registration, and the signal-to-noise ratio during imaging. By scattering a laser off the apex of a commercial AFM tip, we locally measured and thereby actively controlled its three-dimensional position above a sample surface to <40 pm (Delta f = 0.01-10 Hz) in air at room temperature. With this enhanced stability, we overcame the traditional need to scan rapidly while imaging and achieved a 5-fold increase in the image signal-to-noise ratio. Finally, we demonstrated atomic-scale (similar to 100 pm) tip-sample stability and registration over tens of minutes with a series of AFM images on transparent substrates. The stabilization technique requires low laser power (<1 mW), imparts a minimal perturbation upon the cantilever, and is independent of the tip-sample interaction. This work extends atomic-scale tip-sample control, previously restricted to cryogenic temperatures and ultrahigh vacuum, to a wide range of perturbative operating environments.
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