Bulk Phonon-Polaritons in Reststrahlen Region of A3B5 Compound Superlattice
Superlattices composed of layers whose dielectric functions ε(v) are of the opposite sign are known to support the propagation of specific electromagnetic modes which are related to a bulk-type polarization [1–3]. The term, bulk modes, is chosen in order to distinguish between the relevant excitations and the interface modes, encountered under similar conditions ε(v)1ε(v)2 < 0. The existence of bulk modes has been confirmed experimentally in InSh/Al2O3 structures in the millimeter wave region , where the values of εv for InSb are negative due to the free-carrier plasma (or magnetoplasma) contribution.
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