Off-resonant third-order optical nonlinearities of squarylium and croconium dyes

被引：0

作者：

Li, Zhongyu ^{[1
,2
]}

Xu, Song ^{[3
]}

Niu, Lihong ^{[1
]}

Zhang, Zhi ^{[1
]}

Chen, Zihui ^{[1
]}

Zhang, Fushi ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Chem, Minist Educ, Key Lab Organ Photoelectrons & Mol Engn, Beijing 100084, Peoples R China

[2] Jilin Inst Chem Technol, Dept Chem Engn, Changchun 130022, Jilin, Peoples R China

[3] Northeast China Univ Elect Power Engn, Dept Appl Technol, Jilian, Peoples R China

来源：

NONLINEAR OPTICS: TECHNOLOGIES AND APPLICATIONS | 2008年 / 6839卷

关键词：

third-order optical nonlinearities; degenerate four-wave mixing; squarylium dye; croconium dye; off-resonant conditions;

D O I：

10.1117/12.754290

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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 x 10(-31) esu for the squarylium dye and 8.69 x 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.

引用

页数：7

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