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Frustrated total internal reflection

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Presentation on theme: "Frustrated total internal reflection"— Presentation transcript:

1 Frustrated total internal reflection

2 Frustrated total internal reflection

3 FTIR How does it show up in the theory?

4 waves at a single boundary Snell’s law, R, T
Frustrated TIR Analogy to reflection, transmission, tunneling in QM

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7 Frustrated total internal reflection for multi-touch displays

8 Why do we see vivid colors in reflection and not much in transmission?

9 Double boundary

10 Air-Water (n=1.3)-Air film (soap film)
Dd/lvac F: one kind of “finesse”

11 Air-Water (n=1.3)-Air film (soap film) Normal incidence
Can we make a device with greater contrast in transmission? T Dd/lvac

12 Air-Diamond (n=2.4)-Air film
T F = 0.88 Dd/lvac

13 Air- Kryptonite? (n=10) -Air
F = 18 Dd/lvac Interference ideas for why increasing r makes these peaks so sharp?

14 Multiple reflection view of r,t
Simple notation assume n0 = n2 so only have r,r’, t,t’ Derive t, the sum of all the terms on the right of the system a) got it right b) tried

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16 Calculation of r Derive r, the sum of all the reflected terms on the left of the system a) got it right b) tried


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