Effects of Doping Concentration and Solvent on All-Optical Switching Characteristics of Azo-Dye-Doped Polymer Films
掺杂浓度与溶剂对偶氮聚合物薄膜全光开关

Ethyl Red doped polymer (PMMA) films and Ethyl Orange doped polymer (PVA) films are prepared by the repeat-spin-coating method,the all-optical switching characteristics of the azo-dye doped film samples are measured,and the effects of the doping concentrations and the solvents on all-optical switching characteristics of the samples are investigated.The experimental results demonstrate that with the increasing doping concentration and the polarity of solvents,the samples will show stronger all-optical switching effect and larger background signal of the switch,but the effect on the response speed of optical switch is trivial.In room temperature condition and with the control beam power of several milliwatts,the polymer films have the response time in millisecond magnitude and the depth of switch modulation above 40% by choosing the proper doping concentrations of the polymer films and the solvent with the strong polarity,and the maximal depth of switch modulation reaches 72%.