1. Announcements 1/20/12
Prayer

2. Review Question (not graded)
In an electro-magnetic wave, the electric and magnetic fields:
are always in phase
always have a relative phase shift
can have a relative phase shift when absorption takes place

3. Reading Quiz
The most important frequency for the optical properties of a conductor is the:
decay frequency, wD
plasma frequency, wP
reflection frequency, wR
resonance frequency, w0

4. Reading Quiz
In a conductor, the optical properties are described by a ___________ index of refraction:
totally real
totally imaginary
partially real and partially imaginary

5. Metals: complex n
From P&W Fig 2.6 (and HW P2.8…)

6. Reflectance vs. Wavelength
From Hecht
Plasma frequency

7. Reading Quiz
The vector that gives the direction of energy transfer through space in an E-M wave is called the:
Clausius vector
flow vector
Michelson vector
polarization vector
Poynting vector

8. Energy stored in fields (appendix)

9. Derivation of Poynting Theorem
Bottom eqn minus top eqn…
Multiply both sides by -1/m0 …

10. Derivation of Poynting Theorem, cont.
like a flux,
call it S
energy density, ufield
(J includes both Jfree and Jpolar)
has units of
energy density/time…
call it “dumedium/dt”
compare to Eqn of Cont.

11. Intensity