Improvement of all-optical switching effect based on azobenzene-containing polymer films |
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| Authors: | Y Luo W She S Wu F Zeng S Yao |
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| Institution: | (1) State key laboratory of optoelectronic material and technologies, Zhongshan University, 510275 Guangdong, China;(2) Department of Physics, Shaoguan University, 512005, Shaoguan, Guangdong, China;(3) Department of Polymer Science and Engineering, South China University of Technology, 510640 Guangdong, China |
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| Abstract: | A method for improving the quality of all-optical switching is presented. Pumping poly(methyl methacrylate) (PMMA) films doped with azobenzene chromophore Disperse Red 1 (DR1) with two beams (a linearly and a circularly polarized), all-optical switching effects with very low background and high stability are demonstrated. High frequency switching, which is hard to be realized under pump of a single beam, is obtained. The circularly polarized pump beam can erase the photoinduced birefringence and quicken the relaxation process, thus lowering the background and improving the stability and the extinction ratio of the switching signal. PACS 42.70.Jk; 42.25.Lc; 82.30.Qt; 78.20.Fm; 77.80.Fm |
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