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Large Third-Order Optical Nonlinearity and Fast Response of a Squarylium 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 2282-2285 |
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Abstract The third-order optical nonlinearities and responses of a squarylium dye, 2,4-di-3-guaiazulenyl-1,3-dihydroxycyclo\-butenediylium dihydroxide, in tetrahydrofuran (THF) solution and in polystyrene (PS) coating films are measured by the femtosecond degenerate four-wave mixing technique under resonant conditions. The molecular hyperpolarizability g of the squarylium dye in the THF solution is determined to be 3.0 × 10-29,esu at 764nm, and its electronic component γe is determined to be 1.1 × 10-29esu. The third-order nonlinear susceptibility x(3) of one of the present PS coating films containing the squarylium dye is as high as 3.1 × 10-8esu at 800nm, and its electronic component x(3)-e is 1.3 × 10-8esu.
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| Keywords:
42.65.An
42.70.Nq
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Published: 01 September 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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