
353Introduction to Optical Coatings and Thin Film Production
Chapter 13
frequency of the incoming electromagnetic wave. isvibration takes energy from
the wave, but the vibrating dipole also emits energy, that is, scatters it, all at the same
frequency. e close packing of the units in a solid implies a close phase relationship
between the various oscillating dipoles, resulting in what is called coherent scattering
of the input light where the scattered light cancels in every direction but the primary
one. Because of the transfer of energy rst into the dipole oscillations and then out,
the scattered eld lags behind the primary eld in phase ...