Strong amplitude-phase coupling in submonolayer quantum dots

Submonolayerquantum dots promise to combine the beneficial features of zero- and two-dimensional carrier confinement. To explore their potential with respect to all-optical signal processing, we investigate the amplitude-phase coupling (α-parameter) insemiconductor optical amplifiers based on InAs/GaAssubmonolayerquantum dots in ultrafastpump-probe experiments. Lateral coupling provides an efficient carrier reservoir and gives rise to a largeα-parameter. Combined with a high modal gain and an ultrafast gain recovery, this makes thesubmonolayerquantum dots an attractive gain medium for nonlinear optical signal processing.

Source: Applied Physics Letters - November 14, 2016 Category: Physics Authors: Bastian Herzog, Benjamin Lingnau, Mirco Kolarczik, Y ücel Kaptan, Dieter Bimberg, André Maaßdorf, Udo W. Pohl, Ricardo Rosales, Jan-Hindrik Schulze, Andre Strittmatter, Markus Weyers, Ulrike Woggon, Kathy Lüdge and Nina Owschimikow Source Type: research