A feedback loop holds the electron current constant by keeping the distance from probe to sample constant.

Scanning Tunneling Microscope - How Nanoscientists see Atoms
24/07/2017 0 min

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More episodes of the podcast Scanning Tunneling Microscope - How Nanoscientists see Atoms

Scanning tunneling microscopes (STMs) allow nanoscientists to see individual atoms. 24/07/2017
To see how a Nanosurf easyScan STM works, let's take it apart in virtual reality. 24/07/2017
The heart of the STM is an atomically sharp probe. 24/07/2017
A voltage induces electrons to jump from the probe's tip to the sample atoms. 24/07/2017
But how can it move the probe over these tiny nanometer distances? 24/07/2017
Voltages to a piezoelectric crystal move the probe in and out. 24/07/2017
Another crystal moves it side to side. 24/07/2017
A third crystal moves it up and down. 24/07/2017
Let's see how these work together to create an atomic scale map of the sample surface. 24/07/2017
The voltage to the back crystal determines pixel color. Voltages on the other crystals move the probe and pixels side-to-side and up-and-down. 24/07/2017
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