Research On Novel Sensor Of Photonic Crystal Fiber For Refractive Index And Temperature

With the development of optical communication and sensing technologies,the requirements on the performance of optical fiber are increasing gradually.The photonic crystal fibers(PCFs),as the new special fibers,have some advantages including adjustable cladding structure,rich post-processing methods,and good transmission performances.Therefore,the design and development of various optical devices based on the PCF have become a hot spot in the field of photonics at home and abroad,among which PCF sensor is particularly concerned because of its wide application.In this thesis,the refractive index and temperature sensors are,respectively,studied,and the research results are summarized as follows:1.A D shaped PCF refractive index(RI)sensor based on surface plasmon resonance(SPR)effect is designed,and its sensing performance are studied.The sensor adopts the structure of introducing circular arc microchannel after polishing the PCF and gold plating,thus overcoming the previous preparation problems of filling metal wire or gold plating film in a specific closed air hole.The results indicate that when the refractive index range is from 1.33 to 1.38,the average sensitivity can reach 4900 nm/RIU,and the maximum sensitivity can reach 8800 nm/RIU,along with good linear fitting degree.2.A dual-core PCF(DC-PCF)temperature sensor based on toluene filling is designed and studied.According to the linear relationship between the refractive index of toluene and temperature,the change of the peak wavelength of the transmission spectrum as a function of temperature is studied and analyzed.Through the simulation calculation,the average temperature sensitivities in the ranges of-80-0℃ and 0-80℃ are-4.48 nm/℃ and-7.14 nm/℃,respectively.Compared with the reported temperature sensors,the designed sensor has a larger temperature sensing range and higher temperature sensitivity.The proposed PCF temperature sensor also has the advantages of corrosion resistance.In this thesis,the above two kinds of PCF sensors are designed and studied,respectively,and the corresponding refractive index and temperature sensing performances are numerically studied.The related research results will provide useful reference for the development of high sensitivity,real-time and fast response PCF sensor,and provide key component and core technology supports for the construction of optical fiber sensor network and all-optical communication system.