Pb1-xSnxSe薄膜の光学的性質

概要

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Single crystal films of Pb1-xSnxSe (0≤x≤0.1) were prepared on the cleaved KCl substrates by vacuum evaporation. The evaluation procedure of the optical properties, based on the measurement from 2.5 to 25 μm at room temperature, was presented in detail. The content of Sn, x, was determined by the empirical formula of Strauss. Optical absorption at the band edge was found to obey the Urbach rule and attributed to the allowed direct transitions. The dispersion of the refractive index provided a peak closely related to the optical energy gap and it was shifted to a longer wavelength with x. This relationship with respect to x was also confirmed by the increase in the dielectric constant (ε∞) and the shift of the resonance wavelength (λ0) in the single oscillator model.
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