All-optical switchings of 3-hydroxyflavone in different solvents
Wu Feng(吴峰)a)b), Lin Lie(林列)a), Li Xiang-Ping(李向平)a),Yu Ya-Xin(于雅鑫)a), Zhang Gui-Lan(张桂兰)a)†, and Chen Wen-Ju(陈文驹)a)
a Institute of Modern Optics, Nankai University, Optoelectronics Information Science and Technology Laboratory, Ministry of Education, Tianjin 300071, China; b Department of Physics, North University of China, Taiyuan 030051, China
Abstract 3-hydroxyflavone (3-HF) is an organic molecule with an excited-stated intramolecular proton transfer (ESIPT) effect. All-optical switchings and beam deflections of 3-HF in three kinds of solvents (cyclohexane, ethanol and dimethyl sulfoxide) have been investigated by using the third-harmonic generation (355 nm) of a mode-locked Nd:YAG laser as a pump beam and a continuous-wave (cw) He-Ne laser (632.8 nm) as a probe beam. The nonlinear refractive indices of 3-HF in the three different solvents are determined by using the Z-scan technique under an ultraviolet (UV) pump beam at a wavelength of 355 nm. It has been found that the optical switching and beam deflection effects result from the change in refractive index of 3-HF under the irradiation of the pump beam. On the basis of the analyses of absorption spectra and fluorescence spectra, we conclude that the change in refractive index of 3-HF is due to not the thermal effect but the ESIPT effect of 3-HF under the pump beam. As the ESIPT is exceedingly fast, 3-HF might be an excellent candidate for high-speed optical switching.
Received: 17 July 2007
Revised: 29 September 2007
Accepted manuscript online:
PACS:
42.55.Rz
(Doped-insulator lasers and other solid state lasers)
Fund: Project supported by the National
Natural Science Foundation of
China (Grant No 60178025).
Cite this article:
Wu Feng(吴峰), Lin Lie(林列), Li Xiang-Ping(李向平), Yu Ya-Xin(于雅鑫), Zhang Gui-Lan(张桂兰), and Chen Wen-Ju(陈文驹) All-optical switchings of 3-hydroxyflavone in different solvents 2008 Chin. Phys. B 17 1461
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