Resonant third-order optical nonlinearities of thin films containing J-aggregates of a cyanine dye or a squarylium dye

Zhongyu Li; Zhaohui Jin; Kazuo Kasatani

doi:10.1117/12.575280

28 January 2005 Resonant third-order optical nonlinearities of thin films containing J-aggregates of a cyanine dye or a squarylium dye

Zhongyu Li, Zhaohui Jin, Kazuo Kasatani

Author Affiliations +

Proceedings Volume 5646, Nonlinear Optical Phenomena and Applications; (2005) https://doi.org/10.1117/12.575280
Event: Photonics Asia, 2004, Beijing, China

Abstract

The third-order optical nonlinearities and responses of thin films containing the J-aggregates of a cyanine dye or a squarylium dye were measured using the degenerate four-wave mixing (DFWM) technique under resonant conditions. The sol-gel silica coating films containing the J-aggregates of the cyanine dye, NK-3261, are stable at room temperature and durable against laser beam irradiation. The temporal profiles of the DFWM signal were measured with a time resolution of 0.3 ps, and were found to consist of at least three components, i.e., the coherent instantaneous nonlinear response and the two slow responses with delay time constants of ca. 1.0 ps and ca. 5.6 ps. The contribution of the later was small. The electronic component of the effective third-order optical nonlinear susceptibility of the film had value of as high as ca. 3.0 x 10^-7 esu. We also studied the neat film of a squarylium dye J-aggregates. The temporal profile of the DFWM signal of the neat film of squarylium dye was also found to consist of at least three components, the coherent instantaneous nonlinear response and the delayed response with decay time constants of ca. 0.6 ps and ca. 6.5 ps. The contribution of the slow tail was also very small. The electronic component of effective third-order optical nonlinear susceptibility of the neat film of squarylium dye had value of as high as ca. 3.6 x 10^-8 esu.

Citation Download Citation

Zhongyu Li, Zhaohui Jin, and Kazuo Kasatani "Resonant third-order optical nonlinearities of thin films containing J-aggregates of a cyanine dye or a squarylium dye", Proc. SPIE 5646, Nonlinear Optical Phenomena and Applications, (28 January 2005); https://doi.org/10.1117/12.575280

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