1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

A Ellipsometry- why is UV better than Visible light?

  1. Jun 29, 2017 #1

    I was wondering why UV ellipsometry is better than visible ellipsometry?
  2. jcsd
  3. Jun 29, 2017 #2

    Andy Resnick

    User Avatar
    Science Advisor
    Education Advisor

    Better for what?
  4. Jun 30, 2017 #3
    I meant, for certain materials, it is better to use UV light source to measure thin film thickness, and sometimes it is better to use a visible or NIR light source. Can someone please give me a couple of examples of materials that are determined using UV, VIS, and NIR? Why is it good to have the whole UV-VIS-NIR spectrum in an ellipsometer?
  5. Aug 28, 2017 #4
    If you only want to measure the thickness of a film, I believe that a single color i.e. laser is good enough as long as the medium has normal dispersion at that wavelength (negligible absorption). But, if you have access to a broader spectrum you can do spectroscopic ellipsometry, which allows one to more fully characterize a sample. For example, you can measure an absorption spectrum in conjuction with ellipsometry, etc. See this article https://en.wikipedia.org/wiki/Ellipsometry

    The subection on single-wavelength vs spectroscopic ellipsometry directly addresses your question.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted