Observation of Stark shifts in quantum well intersubband transitions

Harwit, Alex; Harris, J. S.
March 1987
Applied Physics Letters;3/16/1987, Vol. 50 Issue 11, p685
Academic Journal
We have observed Stark shifts of quantum well intersubband transitions in a perpendicular electric field. Two samples consisting of 100 and 120 Å GaAs quantum wells separated by 350 Å AlGaAs barriers showed optical absorption peaks at 11.1 and 13.9 μm, respectively. In an electric field of 36 kV/cm, the 13.9 μm peak shifted to 13.7 μm and the 11.1 μm shifted to 11.0 μm, in good agreement with theoretical calculations. These tunable transitions can be applied to high-speed infrared light modulators.


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