Announcements 2/17/12

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... from polarization changes in reflectance is called: circularometry ellipsometry hyperbolometry linearometry parabolometry Ellipsometry Ellipsometry, cont.
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Title: Announcements 2/17/12 1 Announcements 2/17/12
  • Prayer
  • Monday is holiday
  • Tues is virtual Mondaywe have class!
  • Reading assignment for Tuesday
  • Remove section 7.1 (were 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 Ellipsometry starts linear, angle a linear polarizer, angle q 1 does something Wikipedia http//www.gaertnerscientific.com/ellipsometers/l1 16sf.htm 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 w4? What is v for w10?
  • What does that wave look like as time progresses? (next slide)
  • 9 Mathematica What if the two velocities had been the same? 10 Time Evolution of Dispersive Pulse Credit Dr. Durfee Peak moves at about 13 m/s (on my office computer) Amplitude2 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
  • Example where vphase gt vgroup
  • http//en.wikipedia.org/wiki/Group_velocity
  • 13 One of my contributions to Wikipedia
  • Example where vphase is negative!
  • http//en.wikipedia.org/wiki/Group_velocity
  • 14 More movies 15 Start on Fourier handout, if time
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