光子晶体微纳光纤的制备新方法及其特性研究

Fabrication of photonic crystal micro-fiber and its characteristics

为了形成胶体晶体-微纳光纤结构,采用提拉生长法,将单分散的聚苯乙烯微球在微纳光纤表面自组装生长成胶体晶体,并用扫描电子显微镜和光谱仪对胶体晶体的显微形貌和透射光谱特性进行了表征。结果表明,聚苯乙烯微球有序堆积,自组装成胶体晶体,其结构为面心立方密排结构,表面为面心立方结构的[111]面。胶体晶体-微纳光纤的透射光谱在1400.8nm处有透射峰,对应于面心立方结构在[111]方向上的光子带隙。这种光子晶体微纳光纤在光纤传感器及滤波器方面有广阔的应用前景。

In order to fabricate colloidal crystal micro-fiber structure,monodisperse polystyrene microspheres were grown into self-assembled colloidal crystals on the surface of micro-nano fiber by Czochralski method. Microstructure of colloidal crystals and properties of transmission spectra were characterized by scanning electron microscopy and spectroscopy. The results show that polystyrene microspheres are accumulated orderly and are assembled to colloidal crystals by themselves. The colloidal crystal has face-centered cubic structure and the surface of micro-fiber has [111]facet of face-centered cubic structure. The transmission peak of micro-structured fiber is about 1400. 8nm,corresponding to the photonic band gap in the [111] direction of face-centered cubic structure. This kind of micro-fiber with threedimensional photonic crystal structure is very useful in the applications of micro-fiber sensors or filters.