Abstract
Measurements of the real and imaginary parts of the complex refractive index of a nominally undoped single crystal of InSb have been made by a combination of reflection and transmission dispersive Fourier transform spectroscopy in the far-infrared at 300 and 100 K. Features observed in the spectra are assigned as 2-phonon combination bands with the aid of an 11-parameter rigid ion model and good overall agreement has been found between calculated and observed frequencies. In addition, a strong bulk plasmon mode due to free carriers is observed in the low wavenumber region below the reststrahl band.
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