ABSTRACT
We report on a new electrophotonic effect based on resonant Faraday rotation and the quantum confined Stark shift. By applying an electric field to a quantum well structure the exciton energy is red-shifted, thereby tuning the Faraday effect into resonance. We have observed a tunable rotation of 11 deg in a GaAs quantum well structure. This effect could lead to high-speed modulators using magnetic and non-magnetic semiconductor materials.
