Second harmonic generation study of the air/liquid interface of different solutions

Kai Sun; Dechun Li; Lihua Cao; Ying Li; Xinwang Song; Chunxiu Li; Yaping Li; Xulong Cao

doi:10.1117/12.2032883

17 September 2013 Second harmonic generation study of the air/liquid interface of different solutions

Kai Sun, Dechun Li, Lihua Cao, Ying Li, Xinwang Song, Chunxiu Li, Yaping Li, Xulong Cao

Proceedings Volume 8904, International Symposium on Photoelectronic Detection and Imaging 2013: High Power Lasers and Applications; 89040K (2013) https://doi.org/10.1117/12.2032883
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China

Abstract

As an intrinsically surface-specific technique, Second Harmonic Generation (SHG) is widely used in the study of interface in recent years. The SHG signals from the air/liquid interface of Rhodamine B and Sodium Dodecyl Benzene Sulfonate (SDBS) aqueous solutions were obtained and analyzed, which demonstrate that the SHG signal intensity of Rhodamine B is stronger than that of SDBS. Compared with one single solution, the SHG signal intensity of the mixed aqueous solution of Rhodamine B and SDBS decreases. From the UV-VIS absorption spectrum of the two aqueous solutions, it can be seen that Rhodamine B has an absorption peak closer to the second harmonic frequency. Therefore the resonance of the second harmonic frequency with the frequency of the dipole transitions of the chromophore considerably enhances the signal intensity. Furthermore, the hyperpolarizabilities of the molecules of Rhodamine B and SDBS are calculated from first-principles, which reveal that the hyperpolarizability of Rhodamine B molecule is greater than that of SDBS molecule. When they are mixed, molecules of Rhodamine B and SDBS gather together because Rhadamine B molecule carries positive surface charge and SDBS is anionic surfactant, causing the decrease of the SHG intensity of the mixed solution.

Citation Download Citation

Kai Sun, Dechun Li, Lihua Cao, Ying Li, Xinwang Song, Chunxiu Li, Yaping Li, and Xulong Cao "Second harmonic generation study of the air/liquid interface of different solutions", Proc. SPIE 8904, International Symposium on Photoelectronic Detection and Imaging 2013: High Power Lasers and Applications, 89040K (17 September 2013); https://doi.org/10.1117/12.2032883

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