a. Consider three dielectric media with flat and parallel boundaries with refractive indices n1 n2 and n3. Show that for

a. Consider three dielectric media with flat and parallel boundaries with refractive indices n1, n2 and n3.
Show that for normal incidence the reflection coefficient between layers 1 and 2 is the same as that
between layers 2 and 3 if n nn 2 1 3 = . What is the significance of this?
b. Consider a Si photodiode that is designed for operation at 900 nm. Given a choice of two possible
antireflection coatings, SiO2 with a refractive index of 1.5 and TiO2 with a refractive index of 2.3
which would you use and what would be the thickness of the antireflection coating you chose? The
refractive index of Si is 3.5.

 

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