POLAR OPTICAL OSCILLATION MODES IN GAAS-BASED DOUBLE HETEROSTRUCTURES - LONG-WAVELENGTH LIMIT

By applying a theory developed in previous works we calculate the polar oscillation modes of a DHS (double heterostructure) for the GaAs/AlAs system in the long wavelength limit. The material for each layer of the structure is modeled as an isotropic continuum. We report general analytical solutions of the fundamental equations involved in the theory, allowing in principle the study of an arbitrary structure of the same type with N interfaces. For the DHS case we report amplitudes and potentials as a function of coordinates for the various oscillation modes, as well as dispersion relations. Our results show good agreement with experimental data and also with ab initio microscopic calculations, even for relatively large values of the in-plane wavevector. © 1993 Academic Press. All rights reserved.