is it possible to either demonstrate the principle or make a SEM ( electron microscope ) at home or lab as an enthusiast?? and how can i start?
"Yes, you can!" © :-)
Check out this guy on YouTube, he has described everything in detail: http://www.youtube.com/watch?v=VdjYVF4a6iU (and his related videos)
Basically he used an electron gun from a small TV-tube, using phosphor and photomultiplier to detect electrons. Image is shown on an analog oscilloscope.
Although it is doable at home, this is not exactly a weekend project.