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Difference between Frensel reflection and Total Internal Reflection

  1. Feb 8, 2013 #1
    What exactly is the difference between Frensel reflection and total internal reflection with regards to the efficiency of an LED? Do they both occur at the semiconductor/ air interface? I am a bit confused, thanks for the help.
     
  2. jcsd
  3. Feb 22, 2013 #2
    Re: Difference between Frensel reflection and Total Internal Reflectio

    Not difference - they are related.

    * Fresnel reflection: one interface reflected like a transmission line due to impedance/refractive index discontinuity

    * Total internal reflection: two interfaces spaced just at the right distance to constructively reflect or cancel, where each interface has Fresnel reflection
     
  4. Feb 22, 2013 #3

    dlgoff

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    Re: Difference between Frensel reflection and Total Internal Reflectio

    There's a interface between epoxy/plastic and air.

    [​IMG]

    These lenses are designed to get the light out. :biggrin:

    [​IMG]

    But they can't get it all out.

    [​IMG]


    Thanks to http://zeiss-campus.magnet.fsu.edu/articles/lightsources/leds.html for the images.
     
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