Infrared observation of longitudinal optical modes in MBE-grown polar semiconductors films

The feasibility of observing the zone-center longitudinal optical phonon (LO) of a crystal as a minimum in its infrared transmission spectrum, when measured with radiation obliquely incident on a thin film of the crystal, i.e., the Berreman effect, is demonstrated with an MBE′-grown zinc-blende MnTe...

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Bibliographic Details
Published in:Solid state communications 1993, Vol.88 (9), p.711-714
Main Authors: Dean Sciacca, M., Mayur, A.J., Oh, Eunsoon, Ramdas, A.K., Rodriguez, S.
Format: Article
Language:English
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Summary:The feasibility of observing the zone-center longitudinal optical phonon (LO) of a crystal as a minimum in its infrared transmission spectrum, when measured with radiation obliquely incident on a thin film of the crystal, i.e., the Berreman effect, is demonstrated with an MBE′-grown zinc-blende MnTe epilayer. Whereas the zone-center transverse optic phonon (TO) appears irrespective of the polarization of the incident radiation for both normal and oblique incidence, the LO can be detected only in the latter with light polarized in the plane of incidence. We have verified the Berreman effect in a variety of MBE-grown II–VI epilayers and heterostructures.
ISSN:0038-1098
1879-2766
DOI:10.1016/0038-1098(93)90629-2