Interference using a reflection grating: how to determine the slit width?

  1. Hello!
    I'm working on a surface analysis of a silicon-microstrip-detector.
    That is basically a silicon wafer with p- and n- doped strips on it. They are periodically produced on the crystal. Therefore I can use it as a diffraction grating for visible light to do my surface analysis.
    My light source is a common laser pointer.

    What I measure is:
    - the Intensity of the Light (I) at many different angles (alpha)

    What I have to know and want to calculate is:
    1. the slit distance (-> the grating constant) [no problem here]
    2. the slit width [big problems here]

    Now my question is:
    concerning 2.: Can I calculate the slit width using the interference pattern?
    I'm not sure if I could do this using some kind of Fraunhofer diffraction?
    I wasn't able to find any formula relating the slit width of a grating to the interference pattern it creates.

    Maybe you can help me with that. Many Thanks, phil
  2. jcsd
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