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Imaging CDs, DVDs or other optical media under SEM

  1. Jan 12, 2015 #1

    After getting some training I have access to my universities SEM facilities and I would like to image CDs and DVDs with it(, I know that these consist of many layer which may not be transparent to the e-beam so they might need some preparation. Does anyone have any idea? I am reluctant since I could not exactly figure out what kind of preparation is required for say CD-Rs CD-RWs or directly CD-ROMs. Any suggestions and help is appreciated.

    P.S : I found this particular website which might give you a hint about the kind of preparation involved.
  2. jcsd
  3. Jan 14, 2015 #2
    Here is an idea of what you'll see

  4. Jan 14, 2015 #3
    Actually I got the following images where the track pitch is nearly the half of the value indicated on the web and your post (0.8μm ). In order to image the CD-R(Not a CD-ROM), first I broke it carefully then I proceed with the aluminium layer just under the label which did not give much of an image and later I decided give the polycarbonate surface a go and got the resulting images at different magnifications.

    CD23.jpg CD24.jpg CD25.jpg
    Last edited: Jan 14, 2015
  5. Jan 14, 2015 #4
    You have any idea why the track pitch was half of the value it should be?
  6. Jan 15, 2015 #5


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    Staff: Mentor

    Track pitch is the full distance from one line center to another, not the width of those lines.
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