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Surface Phonon Polaritons in Semi‐Infinite Semiconductor Superlattices
Author(s) -
Nkoma J. S.
Publication year - 1987
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221390109
Subject(s) - polariton , superlattice , surface phonon , condensed matter physics , dispersion relation , phonon , semiconductor , wave vector , physics , dispersion (optics) , semi infinite , materials science , optics , quantum mechanics , mathematics , mathematical analysis
Surface phonon polaritons in a semi‐infinite semiconductor superlattice bounded by vacuum are studied. The modes associated with the polaritons are obtained and used to obtain the dispersion relation. Numerical results show that polariton bands exist between the TO and LO phonon frequencies, and are found to approach two surface mode frequencies in the limit of large tangential wave vector. The dependency of frequencies on the ratio of layer thicknessses is shown. The results are illustrated by a GaAs—GaP superlattice bounded by vacuum.