Abstract
The optically nonlinear dye [E--dodecyl-4-(2-(4-docosyloxyphenyl)ethenyl)quinolinium]- forms noncentrosymmetric Langmuir–Blodgett films. The second-harmonic intensity increases quadratically with the number of layers in the range investigated, i.e., as for and shows long-term stability. Films of the dye are almost transparent, with an absorbance of at the second-harmonic wavelength, but, nonetheless, the equivalent monolayer intensity, is of the resonantly enhanced signal from monolayer films of the colored hemicyanine dye reported by Girling, et al. [J. Opt. Soc. Am. B 4, 950 (1987)]. The second-order susceptibility, film thickness, and chromophore tilt angle relative to the normal to the substrate are at 1.064 μm, and respectively, for
© 1998 Optical Society of America
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