Second-harmonic generation together with linear dichroism has been studied on monolayer assemblies of 4-octadecylamino- and 4-docosylamino-4<sup>′</sup>-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
Hiroo Nakahara, Wei Liang, Hiromi Kimura, Tatsuo Wada, and Hiroyuki Sasabe, "Linear and nonlinear optical behaviors of Langmuir Blodgett multilayers of push pull tolan derivatives," J. Opt. Soc. Am. B 15, 458-465 (1998)