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Room-temperature enhancement of electro-optical modulation by resonance-induced exciton mixing in a GaAs/AlAs superlattice.

Erhöhung der elektro-optischen Modulation durch Resonanz-induziertes Exziton-Mischen in einem GaAs/AlAs Übergitter bei Raumtemperatur
: Ploog, K.; Schneider, H.


Applied Physics Letters 58 (1991), Nr.18, S.1994-1996 : Abb.,Lit.
ISSN: 0003-6951
ISSN: 1077-3118
Fraunhofer IAF ()
electroptic modulation; elektrooptische Modulation; Stark localization; Stark-Lokalisierung; superlattice; Übergitter

We report on room-temperature absorption properties of a GaAs/AlAs short-period superlattice in which, at certein electric fields perpendicular to the layers, different conduction subbands centered in adjacent and nonadjacent wells show a level repulsion and an anticrossing behavior. The associated mixing between the corresponding electron wave functions reduces the oscillator strengths and influences the transition energies of certain excitons. These electric field effects can be used to improve the performance of electro-optical modulator devices. Our results also provide a method to investigate the high-field coherence properties of charge carriers in superlattices.