DETERMINATION OF OPTICAL-PROPERTIES OF ALUMINUM INCLUDING ELECTRON RERADIATION IN THE LORENTZ-DRUDE MODEL

The effect of electron reradiation was included in the Lorentz-Drude (LD) model and by applying the least-squares fitting method the values of the characteristic parameters (ωp, G{cyrillic}, τ) of electrons in aluminium were determined. The values of these parameters allowed the determination of optical properties of aluminium for light of wavelengths λε[43.5 nm, 200 μm]. By including the reradiation of electrons the precision of the LD model has been increased in the infra-red region of wavelengths λε[1 μm, 200 μm]. In addition, the reradiation of electrons gives the square frequency dependence for damping frequency [G{cyrillic}′(ω) = G{cyrillic} +τω2], enabling the suitable application of the LD model in the broad range of wavelengths λε[43.5 nm, 200 μm]. It was estimated that the short wave limit at which the LD model can be used for aluminium occurs at about λmin = 43.5 nm. © 1990.