Far infrared optical properties of indium antimonide

R. B. Sanderson

The reflectivity of indium antimonide has been measured between 20 and 200 cm-1 at temperatures of 100 and 300°K on an interferometric modulation spectrometer. Classical dispersion formulae for the free carrier absorption and the lattice vibrations have been fitted to the observed curves. The improved spectral purity, available with the interferometric modulator, permits a satisfactory fit and eliminates discrepancies between theory and experiment previously observed in the long wave region. The effective masses obtained from this fit are in good agreement with values obtained by other methods and the mobilities are within a factor of two of the d-c values. The feasibility of using the Kramers-Kronig transform to obtain the optical constants is also investigated. © 1965.

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Materials
Curve 1
Temperature K: 100 Wavelength Range, µm: 50.0-490 Geometry θ θ' ω': 10° 10° Composition (weight percent), Specifications and Remarks: Single crystal, n-type; impurity concentration, 6 x 10¹⁸ cm⁻³; ground and polished. (Same sample as curve 26.)
Curve 2
Temperature K: 300 Wavelength Range, µm: 50.0-483 Geometry θ θ' ω': 10° 10° Composition (weight percent), Specifications and Remarks: Above specimen and conditions.