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Proceedings Paper

Off-resonant third-order optical nonlinearities of squarylium and croconium dyes
Author(s): Zhongyu Li; Song Xu; Lihong Niu; Zhi Zhang; Zihui Chen
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Paper Abstract

The magnitude and dynamic response of the third-order optical nonlinearities of squarylium and croconium dyes in methanol solution were measured by femtosecond degenerate four-wave mixing (DFWM) technique at 800 nm. Ultrafast nonlinear optical responses have been observed, and the magnitude of the second-order hyperpolarizabilities was evaluated to be 5.80 × 10-31 esu for the squarylium dye and 8.69 × 10-31 esu for the croconium dye, respectively. The large optical nonlinearities of the dyes can be attributed to their rigid and intramolecular charge transfer structure, and the instantaneous NLO responses of dyes are shorter than the experimental time resolution (50 fs), which is mainly contributed from the electron delocalization. The fast nonlinear response and large third-order optical nonlinearities show that the studied squarylium and croconium dyes might a kind of promising materials for the applications in all-optical switching and modulator.

Paper Details

Date Published: 7 February 2008
PDF: 7 pages
Proc. SPIE 6839, Nonlinear Optics: Technologies and Applications, 683910 (7 February 2008); doi: 10.1117/12.754290
Show Author Affiliations
Zhongyu Li, Tsinghua Univ. (China)
Jilin Institute of Chemical Technology (China)
Song Xu, Northeast China Univ. of Electric Power Engineering (China)
Lihong Niu, Tsinghua Univ. (China)
Zhi Zhang, Tsinghua Univ. (China)
Zihui Chen, Tsinghua Univ. (China)

Published in SPIE Proceedings Vol. 6839:
Nonlinear Optics: Technologies and Applications
Yiping Cui; Qihuang Gong; Yuen-Ron Shen, Editor(s)

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