Abstract
The first observation of the resonant Stark tuning of second harmonic generation is reported. Our AlInAs/GaInAs asymmetric coupled-well structures are engineered in such a way that certain intersubband transitions (1→2 and 2→3) exhibit a large Stark shift equal to the potential drop between the centers of the wells. Thus the second-order susceptibility ‖χ(2)2ω‖ exhibits a pronounced peak when the bound states are made equally spaced by the application of an electric field and ℏω=ΔE12. A peak ‖χ(2)2ω‖=7.5×10−8 m/V, approximately 200 times the bulk values in InAs and GaAs, has been measured.
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