Announcements 1/25/12


Prayer
3 students still not getting credit for clicker
quizzes. Please check your scores online to
make sure you’re not one of them.
Which plane is which

Plane of incidence
s vs p polarizations

Plane of the surface
boundary conditions
Fresnel Equations, summary

If near perpendicular (1-D problem)
v2  v1 n1  n2
r

v1  v2 n1  n2


2v2
2n1
t

v1  v2 n1  n2
For arbitrary angle
1  
rs  polar . 
1  
2
ts  polar . 
1  
 
rp  polar . 
 
2
t p  polar . 
 
Intensity coefficients
R r
2
T  1 r
2
with
cos2
cos1
n
 2
n1

Setting up HW problem P3.1
Fresnel Eqn Summary: Eqns 3.18-3.21
1  

1  
2

1  
 

 

2
 
cost
nt
with  
,
cos i
ni
Reading Quiz

Brewster’s angle occurs when i and t
a. Are equal
b. Are in a 2:1 ratio
c. Sum to 90
d. Sum to 45
Plots for air (n=1) to glass (n=1.5)
s-polarization
p-polarization
field amplitudes vs 
field amplitudes vs 
1.0
t
0.5
t
0.8
0.6
20
40
60
80
r
0.5
0.4
r
0.2
20
1.0
40
60
80
0.2
intensities vs 
Do you always intensities
get a
180 phase shift1.0in airglass reflections?
0.8
1.0
T
0.8
0.6
0.6
0.4
0.4
R
0.2
20
40
vs 
T
R
0.2
60
80
Brewster’s angle!
20
40
60
80
Reading Quiz

Total internal reflection happens for:
a. s-polarized light
b. p-polarized light
c. Both polarizations
Reading Quiz

During total internal reflection when light
strikes a glass-air interface (from the glass
side), the electric field in the air just outside
the glass is called the:
a. Evanescent wave
b. Fluorescent wave
c. Optometric wave
d. Reduction wave
e. Vanishing wave
Total internal reflection
Reading Quiz

When light strikes an air-metal interface, a
complex index of refraction for the metal will
give rise to a complex reflection coefficient
a. True
b. False
Reflection from a metallic surface