THE EFFECT OF GEOMETRY OF A MEDIUM ON ITS OPTICAL RESPONSE.
PENNSYLVANIA UNIV PHILADELPHIA DEPT OF PHYSICS
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The resonance excitation frequencies of an assembly of electric dipole oscillators such as the elementary excitations in a solid, i.e., optical phonon and plasmon, are dependent on the geometry of the medium. For a slab configuration a mathematical treatment is given of the longitudinal and transverse resonance frequencies. For thin film slab and oblique incidence, the electromagnetic radiation can couple to the longitudinal, as well as the transverse excitation mode, when the plane of polarization of the electric field is in the plane of incidence. The absorption of power by the excitation modes is characterized by the imaginary part of the shape-dependent dielectric response constant. Data on this constant, derived from thin film oblique incidence measurements, provide information about the resonance frequencies and damping constants of both the transverse and longitudinal excitation modes. Author