| Original Articles |
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Resonant Third-Order Optical Nonlinearities of Poly(methyl methacrylate) Films Containing J-Like Aggregates of a Thiadicarbocyanine Dye |
| LI Zhong-Yu;JIN Zhao-Hui;KASATANI Kazuo;OKAMOTO Hiroaki |
| Department of Advanced Materials Science and Engineering, Faculty of Engineering, Yamaguchi University, Tokiwadai, Ube, Yamaguchi 755-8611, Japan |
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| Cite this article: |
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LI Zhong-Yu, JIN Zhao-Hui, KASATANI Kazuo et al 2005 Chin. Phys. Lett. 22 2571-2575 |
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Abstract The third-order optical nonlinearities and responses of poly(methyl methacrylate) (PMMA) coating films containing J-like aggregates of a thiadicarbocyanine dye, 3,3’-diethyl-2,2’-thiadicarbocyanine iodide (DTDCI), are measured by degenerate four-wave mixing (DFWM) technique under resonant conditions. The temporal profiles of the DFWM signal of PMMA coating films containing J-like aggregates of DTDCI are found to consist of three components: i.e., the coherent instantaneous nonlinear response (electronic response) and the two slow responses with decay time constants of about 0.8ps and about 7.0ps. The electronic component of the effective third-order nonlinear susceptibility, x(3)e, of one of the present films is as high as about 2.1 × 10-8esu, and the figure of merit of third-order nonlinearity F (F =x(3)/α) is evaluated to be about 1.9 × 10-13esu cm at 850nm.
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| Keywords:
42.65.An
42.70.Nq
78.20.-e
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Published: 01 October 2005
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| PACS: |
42.65.An
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(Optical susceptibility, hyperpolarizability)
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42.70.Nq
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(Other nonlinear optical materials; photorefractive and semiconductor materials)
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78.20.-e
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(Optical properties of bulk materials and thin films)
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