Diagnostic of the Metal-Dielectric Interface in a Collective Oscillation of Electrons

Light reflected from a dielectric- metal interface describe the existence of resonant modes of the collective oscillation in electron density. The experimental configuration proposed by Otto and Kretschmann- Raether can be used to characterizes the optical properties of thin metallic films in contact with a dielectric medium. In far-field detection, the angular dependence of the reflectivity on Ag/ ambient air shows a sharp minimum beyond attenuated total reflection. At a wavelength, λ the geometric parameters influence strongly the angular resonance θSP. In the case of Ag, λ = 633.0 nm, at the optimal thickness, d = 50.8nm, a resonant coupling is reaches between incident photons and free electrons in the angular range 45° < θSP < 46°. The angular resonance is associated with the optical phenomenon of an energetic transfer predicted theoretically.Light reflected from a dielectric- metal interface describe the existence of resonant modes of the collective oscillation in electron density. The experimental configuration proposed by Otto and Kretschmann- Raether can be used to characterizes the optical properties of thin metallic films in contact with a dielectric medium. In far-field detection, the angular dependence of the reflectivity on Ag/ ambient air shows a sharp minimum beyond attenuated total reflection. At a wavelength, λ the geometric parameters influence strongly the angular resonance θSP. In the case of Ag, λ = 633.0 nm, at the optimal thickness, d = 50.8nm, a resonant coupling is reaches between incident photons and free electrons in the angular range 45° < θSP < 46°. The angular resonance is associated with the optical phenomenon of an energetic transfer predicted theoretically