Enhancement of modulation depth of an all-optical switch using an azo dye-ethyl red film |
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Authors: | Lu Wen-Qiang Chen Gui-Ying Hao Zhao-Feng Xu Jing-Jun Tian Jian-Guo and Zhang Chun-Ping |
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Institution: | Physics Experimental Teaching Center, School of Physics, Nankai University, Tianjin 300071, China; Key Laboratory of Tropical Marine Environmental Dynamics, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China; Photonic Center, School of Physics, Nankai University, Tianjin 300072, China |
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Abstract: | The polymethyl methacrylate (PMMA) film doped with an azo dye ethyl-red (ER) film is employed to demonstrate the properties of an all-optical switch by its photoinduced dichroism and birefringence. We show how to enhance remarkably the modulation depth of all-optical switches almost to 100% by using two linear polarization beams: one beam is inclined at 45o with respect to the probing beam and serves as a pumping beam, and the other beam is perpendicular to the probing beam and used as an erasing beam. Furthermore, a maximum-to-minimum output intensity ratio of 2000:1 is achieved in experiment, which is very useful and important for optical storages and image displays. |
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Keywords: | all-optical switch azo dye ethyl-red modulation depth |
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