1. Announcements 2/17/12 Reading assignment for Tuesday
Prayer
Monday is holiday
Tues is virtual Monday—we have class!
Reading assignment for Tuesday
Remove section 7.1 (we’re covering it today)
Keep section 7.2
Add Colton Fourier series/transforms handout (I will hand it out now)

2. Reading Quiz
The technique of finding the complex index of refraction, n and k, from polarization changes in reflectance is called:
circularometry
ellipsometry
hyperbolometry
linearometry
parabolometry

3. linear polarizer, angle q
Ellipsometry 3
starts linear, angle a
linear polarizer, angle q 1 2
does something
Wikipedia

4. Ellipsometry, cont. Two measurements, two unknowns  deduce rs and rp
 deduce n and k
if multilayers:
lots of measurements!

5. On to Chapter 7!

6. Poynting vector review

7. Poynting vector for a sum of plane waves

8. Two Different Velocities
What happens if a wave pulse is sent through a dispersive medium? Nondispersive?
Dispersive wave example:
f(x,t) = cos(x-4t) + cos(2 (x-5t))
What is “v”?
What is v for w=4? What is v for w=10?
What does that wave look like as time progresses? (next slide)

9. Mathematica What if the two velocities had been the same? 0.1 seconds

10. Time Evolution of Dispersive Pulse
Credit: Dr. Durfee
Note: frequencies are infinitely close together
Peak moves at about 13 m/s (on my office computer)
|Amplitude|2 for each frequency component
Wave moving in time

11. Phase and Group Velocity
Credit: Dr. Durfee
Window is moving along with the peak of the pulse
12.5 m/s
(peak)
13 m/s

12. From Wikipedia http://en.wikipedia.org/wiki/Group_velocity
Example where vphase > vgroup

13. One of my contributions to Wikipedia
Example where vphase is negative!

14. More movies

15. Start on Fourier handout, if time