Interface, Guided and Non-Localized Modes in Superlattices |
| R. Brazis, R. Narkowicz Semiconductor Physics Institute, Gostauto 11, 2600 Vilnius, Lithuania and Polish University at the Association of Polish Scientists of Lithuania, P.O. Box 823, 2055 Vilnius, Lithuania and L. Safonova Semiconductor Physics Institute, Gostauto 11, 2600 Vilnius, Lithuania |
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| The numerical dispersion calculations in long-period GaAs/AlAs super-lattice were performed using a local theory with retardation as well as an efÂfective medium approximation. The splitting of the dispersion branches near the transverse optical phonon frequencies and phonon-like to photon-like modes transition were found to depend on the superlattice spatial period. The characteristic frequencies of bulk modes and crossing point of disperÂsion branches estimated analytically with the use of an effective medium approximation were found to agree with the results of rigorous solution. |
| DOI: 10.12693/APhysPolA.87.333 PACS numbers: 78.66.-w |