Sacha De’Angeli from ChemHacker has released the schematics and source code of the Scanning Tunneling Electron Microscope. The STM is Arduino based and has been a build in progress for quite a long time now. Looks like it is at a great state now! See the Wikipedia page for more generic information about Scanning Tunneling Electron Microscopes.
“The STM is based on the concept of quantum tunneling. When a conducting tip is brought very near to the surface to be examined, a bias (voltage difference) applied between the two can allow electrons to tunnel through the vacuum between them. The resulting tunneling current is a function of tip position, applied voltage, and the local density of states (LDOS) of the sample. Information is acquired by monitoring the current as the tip’s position scans across the surface, and is usually displayed in image form. STM can be a challenging technique, as it requires extremely clean and stable surfaces, sharp tips, excellent vibration control, and sophisticated electronics.“
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