Third- and higher-order optical nonlinear phenomena in absorbing dye LB films

Weichong Du; Kangsheng Chen

doi:10.1117/12.58080

1 April 1992 Third- and higher-order optical nonlinear phenomena in absorbing dye LB films

Weichong Du, Kangsheng Chen

Proceedings Volume 1626, Nonlinear Optics III; (1992) https://doi.org/10.1117/12.58080
Event: OE/LASE '92, 1992, Los Angeles, CA, United States

Abstract

The cyanine dye (Cy) was embedded in (or absorbed by) a monolayer on air-water interface and its multilayer samples deposited on glass slides were obtained. The studies of their absorption spectra showed that Cy in LB films formed H-aggregates. Multiple phase conjugate waves induced by third- and higher-order nonlinearity of the LB film were observed. High to third-order diffractions with two-beam-interaction and self-phase modulation phenomena with single-beam-interaction in the LB film were also observed. The exceptionally large third-order susceptibility was measured to 5*10^-8 esu for the LB film, which is larger than that deduced from measured third-order byperpolarizability of Cy monomers in bulk solution. The origin of this large third-order susceptibility for the LB film, due to the near-resonant and delocalized exiton enhancement in the aggregates, is duscussed as well.

Citation Download Citation

Weichong Du and Kangsheng Chen "Third- and higher-order optical nonlinear phenomena in absorbing dye LB films", Proc. SPIE 1626, Nonlinear Optics III, (1 April 1992); https://doi.org/10.1117/12.58080

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