| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Third-Order Nonlinear Optical Properties of a Series of Polythiophenes |
ZHANG Xiao-Qiang1, WANG Chang-Shun1, LU Guo-Yuan2, HE Ting-Chao1 |
| 1Department of Physics, the State Key Laboratory on Fiber Optic Local Area Communication Networks and Advanced Optical Communication Systems, Shanghai Jiao Tong University, Shanghai 200240 2Department of Chemistry, Nanjing University, Nanjing 210093 |
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| Cite this article: |
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ZHANG Xiao-Qiang, WANG Chang-Shun, LU Guo-Yuan et al 2010 Chin. Phys. Lett. 27 074201 |
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Abstract The third-order nonlinear optical properties of a series of polythiophenes are investigated with the Z-scan method under picosecond pulse laser irradiation at 532 nm. The copolymers exhibit a good nonlinear response: large nonlinear refraction coefficients without nonlinear absorption. The signs of nonlinear refraction coefficients are positive, which are opposite to the negative signs of the polythiophene reported before. The mechanism accounting for the process of nonlinear refraction under pulse laser excitation is analyzed from the viewpoint of the electron-donor/acceptor units of polythiophenes. Moreover, changes of nonlinearity according to the lengths of main chains in polythiophene molecules are discussed.
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| Keywords:
42.65.An
42.65.Jx
42.70.Jk
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Received: 10 March 2010
Published: 28 June 2010
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| PACS: |
42.65.An
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(Optical susceptibility, hyperpolarizability)
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42.65.Jx
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(Beam trapping, self-focusing and defocusing; self-phase modulation)
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42.70.Jk
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(Polymers and organics)
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