Difference between Frensel reflection and Total Internal Reflection

by hairbair
Tags: difference, frensel, internal, reflection
hairbair is offline
Feb8-13, 12:16 PM
P: 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.
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jsgruszynski is offline
Feb22-13, 08:55 PM
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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
dlgoff is offline
Feb22-13, 09:12 PM
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Quote Quote by hairbair View Post
Do they both occur at the semiconductor/ air interface?
There's a interface between epoxy/plastic and air.

These lenses are designed to get the light out.

But they can't get it all out.

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

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