Fabrication And Characteristization Of Microstructure Cladding Optical Fiber Using Graphene Oxide And Colloid Crystals

Graphene oxide(GO) has become a rising star in the graphene family owing to its unique physical and chemical properties originated from the hybridization of the sp2- and sp3- carbon atoms. Graphene oxide has played a important role in many applications such as in optical biosensing. Most importantly, Graphene oxide(GO)can be reduced to prepare graphene(G)sheets with high yield and low cost.Colloidal crystal is a two-dimensional or three-dimensional orderly system.Colloidal self-assembly is an easy and inexpensive way to fabricate photonic crystal.Furthermore, since the lattice size of colloidal crystal is usually in the level of sub-micron, it has also been used to prepare three-dimensional photonic crystal at the wavelength of visible to near-infrared. Thanking to the tunable bandgap of colloidal crystal, it opens up many possibilities for the novel applications in optical switching, photonic chips, optical filters and chemical and biological sensors.In this work, we investigated the mechanism of reduction of graphene oxide induced by violet radiation, and proposed a new type of fiber grating having a cladding of GO-G periodic structure. The fiber grating is fabricated by illuminating the GO film covered on the side-polished fiber(SPF) through a periodic amplitude mask.A dip caused by coupling between the cladding mode and core mode of SPF can be measured in the transmission spectrum of the fiber grating with 500 um period. In addition, we also investigated a method to self-assemble monolayer silica colloidal crystal onto the optical micro-fiber on air-liquid interface. An improved methods of self-assemble monolayer colloidal crystals onto a micro-fiber are also proposed and investigated.Innovation:A novel graphene oxide- graphene periodic structure cladding fiber grating that its loss peak position is near 1540nm、1575nm and 1610 nm prepared by laser reduction.