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Excitonic optical absorption in quantum wells under intense terahertz waves polarized along the grown direction

Excitonic optical absorption in quantum wells (QWs) under intense terahertz (THz) waves polarized along the grown-direction is investigated. The characteristics induced by the strong THz field in the optical absorption spectrum in the QWs near the band gap edge is analyzed by coherent wave approach. The calculated results with and without the presence of THz field are presented. It shows that the excitonic absorption peaks may split or broaden when an intense THz field is applied. The presence of an intense THz field results in the formation of replicas in the absorption spectrum. The replicas are not symmetric and presence on both sides of the main excitonic peaks due to the Coulomb interaction between electrons and holes.