Abstract
Strong correlation between π-electrons in effectively reduced spatial dimensions[1] is a guiding concept in designing organic materials possessing large nonlinear optical responses. Microscopic descriptions of second βijk(-ω3;ω1,ω2) and third γijkl(-ω4;ω1,ω2,ω3) order π-electron virtual excitation processes are required in order to understand at a fundamental level the physical properties and behavior of βijk and γijkl and to provide guidelines for molecular designs of new material structures. The purpose of this paper is to report recent developments concerning the origin and mechanisms for γijkl of quasi-1D conjugated structures and recent observations of optical bistability in quasi-2D structures.
© 1988 Optical Society of America
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