Abstract

Second-harmonic generation together with linear dichroism has been studied on monolayer assemblies of 4-octadecylamino- and 4-docosylamino-$4^{\prime }$-nitro-tolan. These amphiphiles form condensed monolayers at the air–water interface. Using the conventional Langmuir–Blodgett and the horizontal lifting methods, we obtained the alternating Y-type and the nonalternating X-type multilayers, respectively, and the considerably anisotropic second-harmonic generation of both types was observed, depending on the dipping direction of solid substrates or the monolayer compression.

© 1998 Optical Society of America

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