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用改进的垂直沉积法在光纤端面制备了高质量的SiO2胶体光子晶体,经过烧结、固化构成胶体光子晶体-光纤结构.用扫描电子显微镜确定了样品为面心立方密排结构,其密排面平行于光纤基底表面.利用全光纤传感网络测试了该胶体光子晶体,反射峰中心位于845nm处,与Bragg理论计算值符合很好.将该样品浸入不同折射率的液体中,反射光谱的峰值位置随着液体折射率的改变而发生偏移,近似呈线性关系,实现了峰位可调.对于不同浓度引起的液体折射率的变化,基于光纤的胶体光子晶体结构也能够很好地分辨出来.
A high-quality colloidal photonic crystal of colloidal silica was prepared by the modified vertical deposition method and sintered to form a colloidal photonic crystal-fiber structure. The surface-centered cubic closed-packed structure was confirmed by scanning electron microscopy, Parallel to the surface of the optical fiber substrate.The colloidal photonic crystal was tested by an all-optical fiber sensor network with the center of the reflection peak at 845nm, which is in good agreement with the Bragg theoretical calculation.The sample was immersed in liquids of different refractive index, the peak of the reflection spectrum The position shifts with the change of the refractive index of the liquid, which is approximately linear, and the peak position is adjustable. The colloidal photonic crystal structure based on the optical fiber can also be well resolved for the changes of the liquid refractive index caused by different concentrations .