Abstract

A new method for creating and enhancing second-order optical nonlinearity in polymer-dye films by asymmetric photoinjection of electric charges is introduced. The samples are composed of two separate layers, an organic photoconductor that generates the electric charges and a hyperpolarizable organic film that traps them. The nonlinearity caused by asymmetric charge injection does not arise from dipolar alignment; consequently, it can be observed either in the absence of, or to enhance, the conventional dipolar alignment nonlinearity.

© 1994 Optical Society of America

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