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Complex refractive index mesurement from reflectivity data

  1. Aug 9, 2010 #1
    hi All,

    Just wondering how you get the complex refractive index of a material from relectivity measurements at a single angle. I understand you must infer some of the data, using the Kramers Kronig relations, is this right?

    Is there a direct way of calculating it? I see from an article on elipsometry that is you have the ratio of the reflction of plane and paralell polarised light

    from wiki

    Ps/Pp = tan(Phi)exp(ixdelta)

    where delta is the phase shift, and the amplitued is tan(Phi), but here you still have one unkown. Any ideas on doing this without the kramers kronig relation?

  2. jcsd
  3. Sep 16, 2010 #2
    ellipsometry measures n, k and e1, e2 directly. however if you have reflectivity data from photospectrometer then you may use R=(n-1)^2+K^2/(n+1)^2+k^2, you will have to account for multiple reflections
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