Chin. Phys. Lett.  2011, Vol. 28 Issue (8): 084208    DOI: 10.1088/0256-307X/28/8/084208
FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
Third-Order Optical Nonlinearities of Squarylium Dyes with Benzothiazole Donor Groups Measured Using the Picosecond Z-Scan Technique
LI Zhong-Yu1**, XU Song1, CHEN Zi-Hui2, ZHANG Fu-Shi2, KASATANI Kazuo3
1College of Petrochemical Engineering, Changzhou University, Changzhou 213164
2Department of Chemistry, Tsinghua University, Beijing 100084
3Department of Advanced Materials Science and Engineering, Faculty of Engineering, Yamaguchi University, Tokiwadai, Ube 755-8611, Japan
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LI Zhong-Yu, XU Song, CHEN Zi-Hui et al  2011 Chin. Phys. Lett. 28 084208
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Abstract Third-order optical nonlinearities of two squarylium dyes with benzothiazole donor groups (BSQ1 and BSQ2) in chloroform solution are measured by a picosecond Z-scan technique at 532 nm. It is found that the two compounds show the saturation absorption and nonlinear self-focus refraction effect. The molecular second hyperpolarizabilities are calculated to be 7.46×10−31 esu and 5.01×10−30 esu for BSQ1 and BSQ2, respectively. The large optical nonlinearities of squarylium dyes can be attributed to their rigid and intramolecular charge transfer structure. The difference in γ values is attributed to the chloro group of benzene rings of BSQ2 and the one−photon resonance effect. It is found that the third-order nonlinear susceptibilities of two squarylium dyes are mainly determined by the real parts of χ(3), and the large optical nonlinearities of studied squarylium dyes can be attributed to the nonlinear refraction.
Keywords: 42.65.An      42.70.Nq     
Received: 06 April 2011      Published: 28 July 2011
PACS:  42.65.An (Optical susceptibility, hyperpolarizability)  
  42.70.Nq (Other nonlinear optical materials; photorefractive and semiconductor materials)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/28/8/084208       OR      https://cpl.iphy.ac.cn/Y2011/V28/I8/084208
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LI Zhong-Yu
XU Song
CHEN Zi-Hui
ZHANG Fu-Shi
KASATANI Kazuo
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