Today in Physics 218: conductors
Electromagnetic waves in conductors Attenuation of the waves, and an electronic analogy Penetration of waves into conductors: skin depth
E
13 February 2004
Physics 218, Spring 2004
1
Electromagnetic waves in conductors
Con
Today in Physics 218: dispersion
Motion of bound electrons in matter, and the frequency dependence of the dielectric constant Dispersion relations Ordinary and anomalous dispersion The worlds largest-selling (nearly 30 million copies!) illustration of dis
Today in Physics 218: stratified linear media II
Characteristic matrix formulation of reflected and transmitted fields and intensity Examples: Single interface Plane-parallel dielectric in vacuum Multiple quarterwave stacks
11 February 2004
Electron micro
Today in Physics 218: waves
Electromagnetic waves Waves on a string The simple solutions to the wave equation Sinusoidal waves E
B
t
26 January 2004
Physics 218, Spring 2004
1
Electromagnetic waves
We have already seen that the Maxwell equations can be co
Today in Physics 218: electromagnetic waves in
linear media
Their energy and
momentum
Their reflectance
and transmission,
for normal
incidence
Their polarization
Sunrise over Victoria Falls,
Zambezi River. (Photo by Galen
Rowell.)
2 February 2004
Physics
Today in Physics 218: Fresnel's equations
Transmission and reflection with E parallel to the incidence plane The Fresnel equations Total internal reflection Polarization on reflection Interference
1
0.8
Germanium n = 3.9
IR II
0.6
0.4
0.2
0
0
20
I ( degr
Today in Physics 218: stratified linear media I
Interference in layers of linear media Transmission and reflection in stratified linear media, viewed as a boundary-value problem Matrix formulation of the fields at the interfaces Low-n layers Substrate
Inc
Today in Physics 218: back to electromagnetic waves
Impedance Plane electromagnetic waves Energy and momentum in plane electromagnetic waves Radiation pressure
Artists conception of a solar sail: a spacecraft propelled by solar radiation pressure. (Benjam
Today in Physics 218: impedance of the vacuum, and Snell's Law
The impedance of linear media Spacecloth Reflection and transmission of electromagnetic plane waves at interfaces: Snell's Law and the first Fresnel relation Lots of small pieces of Eccosorb s
Today in Physics 218: the Maxwell equations
Beyond magnetoquasistatics Displacement current, and Maxwells repair of Ampres Law The Maxwell equations Symmetry of the equations: magnetic monopoles?
Rainbow over the Potala Palace, Lhasa, Tibet, by Galen Rowe
Today in Physics 218: the classic conservation laws in electrodynamics
Poyntings theorem Energy conservation in electrodynamics The Maxwell stress tensor (which gets rather messy) Momentum conservation in electrodynamics Electromagnetism on the sun, doing
Today in Physics 218: updates for other tools in electrodynamics
From last time: Symmetry of the equations: magnetic monopoles? The Maxwell equations in matter Boundary conditions for electrodynamics Potentials in electrodynamics
Note: Mondays class is ca