Nonlinearity and recovery time of 1.55 µmintersubbandabsorption in InGaAs/AlAs/AlAsSb coupled quantum wells
- 18 January 2001
- journal article
- Published by Institution of Engineering and Technology (IET) in Electronics Letters
- Vol. 37 (2) , 129-130
- https://doi.org/10.1049/el:20010087
Abstract
Values for the nonlinearity and recovery time of 1.55 µm intersubband absorption have been experimentally obtained for the first time by using InGaAs/AlAs/AlAsSb coupled quantum wells. The third-order susceptibility (χ(3)) has been evaluated to be 5.8×10-17 m2/V2. An ultrafast recovery time (τ) of ~685 fs has been obtained while keeping the figure of merit (χ(3)/ατ) as large as those of interband transitions.Keywords
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