Optical Properties of PbTe

概要

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The real (ε_1) and imaginary (ε_2) parts of the dielectric function, ε(E)=ε_1(E)+iε_2(E), of PbTe have been measured by spectroscopic ellipsometry (SE) in the 1.15-5.4 eV photon-energy range at room temperature. The measured SE spectra reveal distinct structures at energies of E_1, E_2 and E_3 critical points. These data are analyzed using two theoretical models, namely, the model dielectric function (MDF) and standard critical-point (SCP) model. It is found that the SCP model can provide a satisfactory fit to the second derivatives of ε(E) spectra [d^2ε(E)/dE^2], but does not yield good fits to ε (E) spectra. The MDF, on the other hand, results in excellent agreement with the experimental data for both ε(E) spectra and their derivatives. Dielectric-related optical constants, such as the complex refractive index (n^*=n+ik), absorption coefficient (α) and normal-incidence reflectivity (R), of PbTe are also presented.
社団法人応用物理学会の論文
1994-01-15