Landolt-Börnstein - Group III Condensed Matter

4.2.1.3 Experimental determinations of surface polariton dispersion curves

Abstract

This chapter discusses experimental methods which have been used for the determination of surface polariton dispersion curves. The majority of these methods are optical techniques. However, conventional optical absorption or reflection measurements cannot be used for the direct observation of surface polaritons, and modifications of these methods must be employed. Conservation of energy in an absorption or reflection experiment requires that the frequency of the incident light must equal the frequency of the surface polariton. Study of surface polaritons on metal surfaces for attenuated total reflection (ATR) configuration is shown. Since in the ATR method the component of the wave vector of the incident light parallel to the surface is conserved due to the planarity of the latter, the conservation of energy requires the normal component of the wave vector of the incident light to become pure imaginary, and this is achieved by the use of a three-layer geometry. In an alternative experimental technique for measuring the dispersion curves of surface polaritons, energy is directly conserved, but the requirement that ck|| > ωsp(k||) is satisfied by relaxing the conservation condition on the component of the wave vector of the incident light parallel to the surface. The periodic grating method for coupling light into surface polaritons is shown. Raman scattering of light has been used to measure the dispersion curves of surface polaritons on a NaClO2 surface.

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Title
4.2.1.3 Experimental determinations of surface polariton dispersion curves
Book Title
Electronic and Vibrational Properties
In
4.2.1 Introduction
Book DOI
10.1007/b47750
Chapter DOI
10.1007/10086058_66
Part of
Landolt-Börnstein - Group III Condensed Matter
Volume
24B
Editors
  • G. Chiarotti
  • Authors
  • A. A. Maradudin
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