We demonstrate a new waveguide intensity modulator that uses the field-dependent refractive index change associated with quantum wells to control the lateral confinement of light in a slab waveguide. By operating at photon energies ∼40 meV below the zero field electron-heavy hole transition energy, we show, conclusively, that the field-induced refractive index change is primarily due to the quantum-confined Stark effect. Intensity modulators are demonstrated with on/off ratios better than 3:1. Devices based on this electrically controllable lateral confinement will play an important role in integrated optics.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)