Dielectric anisotropy and phonon modes of ordered indirect-gap Al0.52 In0.48 P studied by far-infrared ellipsometry

T. Hofmann, V. Gottschalch, M. Schubert

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Abstract

The infrared (100-600 cm-1) optical properties of partially CuPt-type ordered Al0.52 In0.48 P deposited lattice matched on GaAs are studied by ellipsometry. The authors determine the ordinary and extraordinary dielectric functions and report on the evolution of the optical phonon mode frequencies of Al0.52 In0.48 P as a function of the degree of ordering. In addition to the InP- and AlP-like phonon modes, they observe two alloy-induced phonon modes which are anisotropic upon CuPt ordering. The observed modes are associated to vibrations with E and A1 symmetries. The alloy-induced phonon modes are useful for classifying the degree of ordering in this indirect band gap alloy.

Original languageEnglish (US)
Article number121908
JournalApplied Physics Letters
Volume91
Issue number12
DOIs
StatePublished - 2007

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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