Abstract
We report on the optical absorption and modulation characteristics of strained InxGa1−xAs/GaAs(0.1≤x≤0.25) multiple quantum well (MQW) structures grown on GaAs (100) substrates which also included regions of prepatterned mesas. Sharp excitonic features were realized in samples optimally grown by employing reflection high‐energy electron diffraction. High optical quality MQW structures as thick as 1.5 μm are realized. To date, the highest modulation per unit field at low fields (<50 kV/cm) in this system is achieved.