How do SPM and STM achieve nanoscale probing without contact?

Thread starter philip041
Start date Feb 16, 2009
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Probe Stm

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SPM and STM achieve nanoscale probing without contact through advanced feedback electronics, specifically phase-locked loops (PLLs), which ensure precise control. The use of piezoelectric stacks enables fine position adjustments, allowing the probe to hover at the optimal distance from the sample. This combination of technologies facilitates accurate measurements while preventing physical contact. The overall mechanism is surprisingly straightforward yet highly effective. Understanding these principles is crucial for advancements in nanoscale imaging and manipulation.

Feb 16, 2009

philip041

How on Earth do 'they' get a probe that close to a sample in SPM without it touching (in STM) or at just the right controlled amount?

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Feb 16, 2009

f95toli

Science Advisor

You use very good feedback electronics (a PLL).
This is combination with piezoelectric stacks that allow for very precise position control is the whole "secret", it is actually remarkably simple.

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