Abstract
The folded acoustic modes in a series of InSb/In1-xAlxSb (0.2<x<0.5) strained-layer superlattices were investigated using resonance Raman spectroscopy. Folded modes up to fourth order in the folding index were observed. Analysis of the wavenumbers and intensities of these modes allowed estimates of the superlattice periods and layer thicknesses, and also the ratioP2/P1 of the photoelastic coefficients for the InSb (P1) and alloy (P2) layers at 647.1 nm. TheP2/P1 ratio remarkably changes sign forx≈0.1 under near-resonance excitation owing to the variation in the alloyE1 optical gap withx.
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