The Optical Properties of Cadmium Telluride in the Far Infrared Region

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The reflection spectra of CdTe were measured in the spectral region from 20 μ up to about 400 μ at the two different temperatures, 90°K and 300°K. The Reststrahlen band was found at 65 μ with peak reflectivity of 92% at 90°K and 67 μ with the peak reflectivity of 77% at 300°K. The reflection spectra were analysed by Kramers-Kronig dispersion relation to obtain the optical constants n and k. Combining these values, the fundamental lattice dispersion frequencies of the bulk material were determined to be 140 cm⁻¹ (71.2 μ) at 300°K and 144 cm⁻¹ (69.5 μ) at 90°K. The damping constant was also obtained.