Experimental measurement reveals optical parameters of germanium, suggesting effects of doping levels.
Transmission and reflection spectra of single-crystal germanium plates were experimentally measured in the terahertz spectral range. The optical parameters of germanium were determined at various Sb-doping levels. Saturation of the absorption index was detected with increasing wavelength in the range of 1000-3000 μm. The optical parameters of germanium correspond to the Drude-Lorentz model.
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Shakhmin et al. (2025) studied this question.
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