Multilayered and Multi-material Fabrication Techniques and Detailed Processes for Bragg Fibers

Conventional solid-core optical fibers need the utilization of materials with outstanding transparency. The identification of such materials has proven to be difficult due to the intrinsic limitations associated with the transmission of light through solids, such as absorption, scattering, and nonlinear processes. Hollow optical fibers have the capacity to diminish the dependence on the transparency of fiber materials for the transmission of light. The chapter offers a comprehensive examination of the design and illustration of a hollow optical fiber that is covered with inner omnidirectional multilayer reflectors. The significant photonic bandgaps are accountable for the confinement of light within the hollow core. Recent research has demonstrated notable progress in combining many materials with unique optical, electrical, and thermomechanical characteristics into a single multilayer fiber. This procedure entails extracting the fiber from a preform. The result is the creation of a novel fabric that incorporates different elements and exhibits distinctive capabilities. These capabilities can be accomplished using the size and expenses related to optical fibers. Using this technique, many new fiber-based devices have been made, including transversely emitting fiber lasers, fibers with sensory capabilities for vision and hearing, surface-emitting applications, fibers that can sense light, heat, or sound on their exterior, and fibers with crystalline semiconductor cores. By incorporating these fibers into future fabrics, the resulting textiles will possess enhanced utility. The utilization of several materials in fiber optics has successfully addressed enduring difficulties experienced in traditional applications. For example, multi-material fibers have effectively incorporated photonic bandgap navigation in hollow-core all-solid-cladding fibers and improved the mechanical strength of soft-glass mid-infrared fibers. We offer a comprehensive analysis of the most recent developments in this burgeoning industry and highlight the specific sectors poised for future expansion. The techniques or foundations presented in this chapter will serve as the essential underpinning for the next chapters in this book. Furthermore, the results obtained from this study suggest possible uses of the fiber drawing method as a technology for production. In this discussion, we specifically focus on the ongoing efforts to utilize multi-material-fiber drawing for chemical synthesis and the manufacturing of nanostructures, including arrays of nanowires and structured nanoparticles.