%0 Journal Article
%T All-optical switchings of 3-hydroxyflavone in different solvents<br>
%A Wu Feng
%A Lin Lie
%A Li Xiang-Ping
%A Yu Ya-Xin
%A Zhang Gui-Lan
%A Chen Wen-Ju
%A <br>
%J 中国物理 B
%D 2008
%I 
%X 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.
%K all-optical switching
%K 3-hydroxyflavone
%K ESIPT
%K nonlinear<br>
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=CD8D6A6897B9334F09D8D1648C376FB4&aid=5F8662E06B94199E662C2CC7C5EBF283&yid=67289AFF6305E306&vid=BCA2697F357F2001&iid=E158A972A605785F&sid=7A62566A3C1FFBE1&eid=819029E276C005ED&journal_id=1009-1963&journal_name=中国物理&referenced_num=0&reference_num=0