The Brillouin light-scattering technique has been exploited for studying the Rayleigh acoustic mode in superlattice films consisting of alternate layers of a-Si:H and a-SiNx:H. The phase velocity of the Rayleigh mode has been measured on superlattices with different thicknesses of the a-Si:H layer. The results obtained have been interpreted in terms of the effective medium model within the elastic continuum approximation; no anomalous behavior is observed, in contrast with previous ultrasonic measurements in superlattice with a minor nitrogen content.
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Xia et al. (1994) studied this question.
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