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Carter, S. G; Birkedal, V; Wang, C. S; Coldren, L. A; Maslov, A. V; Citrin, D. S; Sherwin, M. S
Science (American Association for the Advancement of Science), 10/2005, Letnik: 310, Številka: 5748Journal Article
Semiconductor quantum well electroabsorption modulators are widely used to modulate near-infrared (NIR) radiation at frequencies below 0.1 terahertz (THz). Here, the NIR absorption of undoped quantum wells was modulated by strong electric fields with frequencies between 1.5 and 3.9 THz. The THz field coupled two excited states (excitons) of the quantum wells, as manifested by a new THz frequency- and power-dependent NIR absorption line. Nonperturbative theory and experiment indicate that the THz field generated a coherent quantum superposition of an absorbing and a nonabsorbing exciton. This quantum coherence may yield new applications for quantum well modulators in optical communications.
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