Interakce s tercem.pdf - FBMI

OBJEMOVÁ POLARIZACE
The bulk polarization, P, of a material is the
vector sum of the dipole moments, μ i, of
individual molecules per unit volume.
1 N
P mi
aE
V V
The polarizability, α, of the material can be
written in terms of the electric susceptibility,
χ, and the permittivity of vacuum, ε 0, and the
relative permittivity of the material, ε r .
( )
a e e e -
0 0 r 1
Thus, the polarization of the material can be
modeled as.
0
( 1)
Pe e - E
r
E P
The greater the polarization,
the greater the interaction
between the impinging light and
the material.