ABSTRACT
We discuss a new family of electro-optical intensity and phase modulators based on normal-incidence intersubband transitions in GaSb-based asymmetric double quantum wells. An applied electric field transfers the electron population from Γ-valley states to L-valley states, thereby radically altering the resonance energies, strength and polarization dependences of the optical matrix elements, and in-plane effective masses which govern the plasma contribution to the dielectric constant.
