中国物理B ›› 2008, Vol. 17 ›› Issue (4): 1461-1466.doi: 10.1088/1674-1056/17/4/052

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All-optical switchings of 3-hydroxyflavone in different solvents

林列1, 李向平1, 于雅鑫1, 张桂兰1, 陈文驹1, 吴峰2   

  1. (1)Institute of Modern Optics, Nankai University, Optoelectronics Information Science and Technology Laboratory, Ministry of Education, Tianjin 300071, China; (2)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
  • 收稿日期:2007-07-17 修回日期:2007-09-29 出版日期:2008-04-20 发布日期:2008-04-01
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 60178025).

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)   

  1. 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
  • Received:2007-07-17 Revised:2007-09-29 Online:2008-04-20 Published:2008-04-01
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 60178025).

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摘要： 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.

关键词: all-optical switching, 3-hydroxyflavone, ESIPT, nonlinear

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.

Key words: all-optical switching, 3-hydroxyflavone, ESIPT, nonlinear

中图分类号:  (Doped-insulator lasers and other solid state lasers)

  • 42.55.Rz
42.65.Ky (Frequency conversion; harmonic generation, including higher-order harmonic generation) 61.80.Ba (Ultraviolet, visible, and infrared radiation effects (including laser radiation)) 78.20.Ci (Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)) 78.55.Kz (Solid organic materials)