Optical Measurements of the Surface Plasmon of Indium-Tin Oxide

The optical properties of indium-tin oxide are obtained by a least squares curve fit of the Drude intraband model to the attenuated total reflection spectra of its surface plasmon. The theoretical and experimental surface plasmon dispersion curves are analyzed on both, the real frequency axis and in the complex frequency plane. It is shown that a discrepancy exists between the damped theoretical dispersion curve and the attenuated total reflection dispersion curve unless the optical properties of indium-tin oxide are expressed as functions of complex frequency. The complex frequency dependent dielectric function of indium-tin oxide is analyzed and the effects of damping on both the dispersion relationship of the Drude free-electron model and the surface plasmon resonance frequency are determined. Les proprietes optiques de l' oxide du tin-indium ont ete obtenues en utilisant la methode des moindres carres par l' adjustment du modele intrabande de Drude aux spectres de la reflection totale attenuee du plasmon de surface. Les courbes de dispersion theorique et experimentale du plasmon de surface ont ete analysees sur l' axe reel et le plan complexe de frequence. On montre qu 'il existe un deśaccord entre la courbe de dispersion theorique amortie et celle de la reflection totale attenuee a moins que les proprietes optiques de l'oxide du tin-indium soient exprimees en fonction de la frequence complexe. La frequence complexe qui depend de la fonction dielectrique de l'oxide du tin-indium a ete analysee et les effets d'amortissement sur la relation de dispersion du modele de l'electron libre de Drude et la frequence de resonance du plasmon de surface ont ete determiees.

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