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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?

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"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.

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:D i know ..... i am interested in it ...thats why i am going for it! – Siddhartha Sinha Sep 6 '12 at 12:02
what will be the estimated cost for this? – Siddhartha Sinha Sep 6 '12 at 12:12
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@SiddharthaSinha They only expensive part is good vacuum pump. 2-stage chineese pump is about 200 dollars . If it would not be enough - adding used turbomolecular pump might cost ~1000 dollars and more. Everything else might be salvaged from old TV's for free. – BarsMonster Sep 6 '12 at 12:48
seriously for free??????? – Siddhartha Sinha Sep 6 '12 at 13:04
You will need considerable facility with electronics to salvage the needed parts for free, but if you had come to my house last week I could have given you two good quality CRTs for free. I was expected to have to pay US$5 each to dispose of them before a cross-country move. – dmckee♦ Sep 6 '12 at 13:21
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