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

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 filmT
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

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