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Replacing independent single quantum wells inside a strongly-coupledsemiconductor microcavity with double quantum wells produces a special type ofpolariton. Using asymmetric double quantum wells in devices processed intomesas allows the alignment of the electron levels to be voltage-tuned. At theresonant electronic tunnelling condition, we demonstrate that `orientedpolaritons' are formed, which possess greatly enhanced dipole moments. Sincethe polariton-polariton scattering rate depends on this dipole moment, suchdevices could reach polariton lasing, condensation and optical nonlinearitiesat much lower threshold powers.

Oriented polaritons in strongly-coupled asymmetric double quantum well microcavities