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Recently there has been significant interest in multiple quantum wells (MQWs) primarily because of unique physical properties of these systems related to the electronic quantum confinement effects and their possible applications in microelectronics and nonlinear optical devices. Contrary to crystalline quantum structures, amorphous MQW and superlattices like Si-SiO2 heterostructures do not require the lattice matching because of their nonperiodical structure. Thus strong electron confinement can be expected in such quantum structures. Here we have studied the second-order nonlinear optical properties of amorphous Si- Si02 MQW with use of second-harmonic generation (SHG). The anisotropic characteristics of the quadratic response as well as the influence of the applied dc electric field on the SHAG intensity are investigated for this type of MQW.
© 1996 Optical Society of America
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