All-optical switchings of 3-hydroxyflavone in different solvents |
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Authors: | Wu Feng Lin Lie Li Xiang-Ping Yu Ya-Xin Zhang Gui-Lan and Chen Wen-Ju |
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Affiliation: | Institute of Modern Optics, Nankai University,
Optoelectronics Information Science and Technology Laboratory,
Ministry of Education, Tianjin 300071, China; Institute of Modern Optics, Nankai University,
Optoelectronics Information Science and Technology Laboratory,
Ministry of Education, Tianjin 300071, China;Department of Physics, North University of China, Taiyuan
030051, China |
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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. |
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Keywords: | all-optical switching 3-hydroxyflavone ESIPT nonlinear |
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