Abstract
In the form of quantum disks under applied electric field, the second-order nonlinear susceptibility (SONS) in self-assembled quantum dots (QDs) was studied. Nonlinear optical processes results in SONS are discussed, they are: second-harmonic generation (SHG), sum-frequency generation (SFG), difference frequency generation (DFG) and optical rectification (OR). Two types of structures are used the first structure uses the interband transitions in QDs while the second structure uses valence intersubband transitions. SONS relations for SHG, SFG, DFG and OR are derived. A high SONS for the first structure is obtained at long wavelength while a millimeter wavelength is obtained from the second structure which is important in optical communication applications.
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