Fabrication And Sensing Performance Of Micro-nano Fiber

In the past few decades,fiber optic technology has been widely used in the fields of sensing,communication,biology,medicine,aerospace and other fields.With the continuous advancement of production technology and theoretical technology,optical fiber is also developing toward miniaturization.Making micro-nano fiber is an important step to achieve miniaturization of optical devices.Compared with ordinary optical fiber,micro-nano fiber has significant advantages in structure size,transmission loss,light field constraint capability,and evanescent field strength,especially in the sensing field,which has the advantages of small size and high sensitivity.To this end,the research on micro-nano fiber has important theoretical significance and application value.The main research contents of this paper are:the theory of micro-nano fiber structure,optical waveguide characteristics and transmission loss were investigated.The six-dimensional micro-nano fiber fusion taper platform was designed independently,and the micro-nano fiber was prepared by the platform(the prepared micro-nano fiber size was about 5-60 ?m),the optical characteristics of the prepared micro-nano fiber were investigated.The research shows that the micro-nano fiber has a great change in transmission characteristics compared with the ordinary fiber.The evanescent field is greatly improved,and got the micro-light sensing characteristics that the ordinary fiber does not have,the bending is more sensitive and the coupling is better.In addition,using micro-nano fiber optics to investigate the micro-nano fiber sensing characteristics:a PDMS-based micro-nano fiber sensor is fabricated,the research shows that the micro-nano fiber sensor based on PDMS has a stronger evanescent field and better sensing performance;a micro-nano fiber micro-light sensor was prepared,and research shows that the micro-nano fiber micro-light sensor has very good sensing performance for low-light;a micro-nano fiber bending sensor was prepared,and research shows that the micro-nano fiber bending sensor is more sensitive to bending,and the sensitivity increases as the curvature increases.The micro-nano fiber sensor was simulated by RSOFT software.The simulation results show that the theoretical and experimental results of these sensors are in good agreement,which provides theoretical and experimental support for the practical application of the next step.Furthermore,a 2×2 fiber coupler was fabricated using micro-nano fiber,and the characteristics of fiber coupling were investigated.The preparation process and theory of fiber coupler were mastered based on theoretical and experimental research.The characteristic of this subject is that the six-dimensional micro-nano fiber fusion taper platform is designed independently,and some micro-nano fibers are prepared by the fusion taper method.Three micro-nano fiber sensors(PDMS-based micro-nano fiber sensor,micro-nano fiber micro-light sensor and micro-nano fiber bending sensor)and a 2×2 micro-nano fiber directional coupling were designed using the prepared micro-nano fiber,and the experimental phenomena were analyzed using theoretical simulations.The research of this thesis has certain reference significance for the application of micro-nano fiber sensor.