Study of the Molecular Distribution Function and Nonlinear Susceptibility of New Langmuir–Blodgett Films by Second Harmonic Generation

ARARAT YESAYAN, MARGUERITE-M. ROBERGE, TIGRAN V. GALSTIAN, LUC LACHANCE, MARCEL PIGEON, PIERRE COTTIN, TAREK RAHEM, and ANNA M. RITCEY

Sipe’s theory of surface second harmonic generation is used to obtain information about the orientation and nonlinear susceptibility of dipoles in new polymeric Langmuir–Blodgett films. A conic distribution of dipoles with an angular weighting function is found and the molecular nonlinear susceptibility is obtained via comparison of theoretical and experimental data.