Interband Optical Transitions

摘要: The property of translation invariance a periodic medium provides basis for searching normal light waves propagating in such the form Bloch solutions. We discriminate between optical superlattices and short-period regular heterostructures. In an superlattice, adjacent layers have different dielectrical constants. Apart from this, are assumed to be thick enough able neglect electron hole quantum-confinement effects. Under these conditions quantum confinement exciton as whole within one layer may taken into account terms macroscopic theory additional waves, which Maxwell's boundary complemented by excitonic contribution dielectric polarization (the so-called conditions).