Peaks at reflectance spectrum

  1. Dec 13, 2013 #1
    Hello,

    I am currently analysing some relfectance data I obtained from measurements on several silicon samples. During the process I used the standard fresnel coefficients, and suddenly I began to wonder, what the peaks describe? The last graph at this link shows it for normal incident light, I think.

    My typical approach is to relate peaks to the band gap, but then I remembered silicon has a band gap of 1,1 eV.

    So what explains the peaks? I am still thinking, that it is related to the band gap. But the band gap isn't constant either? The 1,1 eV is just the lowest gap, right?

    So do the peaks represent different band gaps with respect to the brillouin zone, or how is it?

    Any suggestions or explanations appreciated! Or possibly a source, that explains it, as I so far had no luck at finding such.
     
  2. jcsd
  3. Dec 31, 2013 #2

    Claude Bile

    User Avatar
    Science Advisor

    One reflectivity peak is due to a peak in the real refractive index, the other is due to a peak in the imaginary refractive index: and that the formula for calculating reflectivity applies for real- and complex-valued refractive indices.

    Note too, that the real and imaginary refractive index components are linked via the Kramers-Kronig relations.

    Claude.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted
Similar Discussions: Peaks at reflectance spectrum
  1. Absorbtion Spectrum (Replies: 11)

  2. Line Spectrum (Replies: 4)

  3. Unexpected peaks! (Replies: 4)

  4. The Atomic Spectrum (Replies: 2)

  5. Bragg peaks (Replies: 10)

Loading...