Polymers 2011, 3(3), 1297-1309; doi:10.3390/polym3031297
Article

Investigation of Second-Harmonic Generation and Molecular Orientation in Electrostatically Self-Assembled Thin Films

1 Arkansas Center for Laser Applications and Science, Department of Chemistry and Physics, Arkansas State University, State University, Jonesboro, AR 72467, USA 2 National Laboratory of Crystal Materials, Shandong University, Jinan, Shandong 250100, China
* Author to whom correspondence should be addressed.
Received: 1 July 2011; Accepted: 16 August 2011 / Published: 18 August 2011
(This article belongs to the Special Issue Polymers for Optical Applications)
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Abstract: We report the observation and measurement of second-harmonic generation in self-assembled ultra thin film nonlinear optical materials using a femtosecond high repetition rate laser system. Second-harmonic intensity, as a function of the incident angle in these films, has been measured using incident p-polarized and s-polarized optical beam components. The second-order nonlinear optical susceptibilities of the thin films have also been determined. Using a curve fitting method and a crystal reference material, we have obtained second-order susceptibilities c333 = 6.17 ± 0.18 pm/V and c311 = 0.68 ± 0.02 pm/V at a fundamental wavelength of 1,200 nm. Based on linear molecular model approximation, we have also used the fitted data to investigate the average orientation distribution of the chromophore dipoles in the self-assembled film. The result indicates that the average tilt angle of the chromophore dipoles away from the substrate normal line is 25.2° ± 0.8°.
Keywords: second-harmonic generation; second-order susceptibility; self-assembly; molecular orientation

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MDPI and ACS Style

Zhang, L.; Cui, D. Investigation of Second-Harmonic Generation and Molecular Orientation in Electrostatically Self-Assembled Thin Films. Polymers 2011, 3, 1297-1309.

AMA Style

Zhang L, Cui D. Investigation of Second-Harmonic Generation and Molecular Orientation in Electrostatically Self-Assembled Thin Films. Polymers. 2011; 3(3):1297-1309.

Chicago/Turabian Style

Zhang, Liangmin; Cui, Deliang. 2011. "Investigation of Second-Harmonic Generation and Molecular Orientation in Electrostatically Self-Assembled Thin Films." Polymers 3, no. 3: 1297-1309.

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