Premium
Resonance Raman Study of Folded Acoustic Modes in StrainedInSb/In 1‐ x Al x Sb Superlattices
Author(s) -
Syme R. W. G.,
Lockwood D. J.,
Labbé H. J.,
Webb J. B.
Publication year - 1996
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/(sici)1097-4555(199603)27:3/4<217::aid-jrs957>3.0.co;2-j
Subject(s) - superlattice , raman spectroscopy , resonance (particle physics) , resonance raman spectroscopy , excitation , materials science , sign (mathematics) , folding (dsp implementation) , chemistry , analytical chemistry (journal) , optics , optoelectronics , atomic physics , physics , mathematical analysis , mathematics , electrical engineering , quantum mechanics , chromatography , engineering
The folded acoustic modes in a series of InSb/In 1‐x Al x Sb (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 ratio P 2 / P 1 of the photoelastic coefficients for the InSb ( P 1 ) and alloy ( P 2 ) layers at 647.1 nm. The P 2 / P 1 ratio remarkably changes sign for x≈ 0.1 under near‐resonance excitation owing to the variation in the alloy E 1 optical gap with x .