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Physical Sciences and Mathematics | Physics
Single-color and two-color pump-probe measurements are used to analyze carrier dynamics in InAs∕GaAs quantum dot amplifiers. The study reveals that hole recovery and intradot electron relaxation occur on a picosecond time scale, while the electron capture time is on the order of 10ps. A longer time scale of hundreds of picoseconds is associated with carrier recovery in the wetting layer, similar to that observed in quantum well semiconductor amplifiers.
O’Driscoll, I. et al., 2007. Electron and hole dynamics of InAs∕GaAs quantum dot semiconductor optical amplifiers. Applied Physics Letters, 91(7), p.071111. Available at: http://dx.doi.org/10.1063/1.2771374.