In a dc biased or built-in asymmetric quantum well (QW) structure, a net charge polarization would be induced by virtual excitations caused by an off-resonant pump light with a photon energy hω far below the fundamental excitonic gap of the QW. The induced virtual charge polarizations may partially screen the original field E0, resulting in a decrease of the internal field,1,2 One of the most striking features of this modulation scheme, named virtual charge- Induced optical nonlinearity (VCON),1 is the possibility of generation of ultrafast voltage pulses in a diode exhibiting multi-QW structure.2 The possibility of ultrafast electrostatic control of quantum interference currents through the voltage pulse generation has been discussed.3 We propose and discuss a new modulation scheme of the quantum interference currents based on more direct interactions, i.e., exchange interactions between coherent election waves and photoexcited virtual pairs.

© 1990 Optical Society of America

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