Optical Constants and The Mechanism of the Propagation of the Surface Waves for Silver Films-in View of the Free Electron Model-Using ATR | ||||
| Egyptian Journal of Solids | ||||
| Article 2, Volume 23, Issue 1, 2000, Page 13-26 PDF (119.66 K) | ||||
| DOI: 10.21608/ejs.2000.151465 | ||||
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| Abstract | ||||
| Using the Drude-free electron theory the polarization parameter P due to interband transitions as well as the optical mass mo and the relaxation time τ of the electrons could be obtained using the estimated values of the real-and imaginary - part of the dielectric constant εr, εi' estimated by obtained attenuated total reflection-measurements for the boundary Ag/air. It has been clear demonstrated that our estimated values P, mo, τ are in consistent with published data. This circumstance has the consequence to obtain a general identities to estimate ε ε r f i , f for silver films in a comparatively wide spectral range. Furthermore the limit energy for the surface plasma oscillations hωs = hωp/ 1 + P = 3.66 eV corresponds to infinite values of the K-vector of the surface plasma waves. In this case both the phase - and the group – velocity Vp, Vg of the surface waves must be equal to zero. In addition the energy limit of interband transitions could be estimated as 3.974 eV. A derivation of two formulae for the phase- and group- velocity of the surface waves could be obtained from the dispersion relation (ω,k). In addition the energetic parameter β and the wave-number parameter χ could be estimated with good accuracy. | ||||
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