Local Surface Plasmon Resonance Refractive Index Sensor Based On Hollow Fiber

Local surface plasmon resonance technology has the advantages of high sensitivity,no labeling and less sample consumption,etc.Hollow core fiber has the advantages of broadband light conduction,low transmission loss and flexible fiber structure,etc.With hollow fiber and local surface plasmon resonance technology combined,a refractive index sensor with high sensitivity and high figure of merit is designed to detect most biomolecules,such as cancer cells,blood components,diabetic tears,etc.Metal nanowires which are easy to obtain high sensitivity can used to stimulate local surface plasmon resonance effect.Hollow core anti-resonant fiber with unique fiber structure is selected to make the separate filling of metal nanowires and analyte still stimulate the strong local surface plasmon resonance effect.Hollow core fiber can not only obtain high sensitivity,high figure of merit and other sensing properties,but also greatly reduce the complexity of the sensor.The main research results are as follows:1.A refractive index sensor with high sensitivity,wide detection range and high linearity based on single cladding hollow core anti-resonant fiber and local surface plasmon resonance is designed.The gold nanowires are filled in two symmetrical cladding tubes of the optical fiber,and the core area is used as the analyte channel to realize the separation of the nanowires and analytes.The sensor has a sensitivity of14996.81 nm/RIU and a linearity of 0.99991 in the wide refractive index detection range of 1.280-1.440.2.A refractive index sensor with high sensitivity and high figure of merit based on nested cladding tube hollow core anti-resonant fiber and local surface plasmon resonance is designed.The metal nanowires and analytes are still filled separately in the cladding tubes and core area of the fiber.The sensor achieves linear sensing in the range of refractive index of biosample 1.350-1.410,with a sensitivity of 21838.02nm/RIU and a maximum figure of merit of 225.56 RIU^-1 when the refractive index of analyte is 1.380.3.Local surface plasmon resonance refractive index sensor is designed based on hollow core fiber for different analytes detection.When the gold nanowires and analytes are filled in the central pores of hollow fiber,they can be used to detect analytes with high refractive index（1.430-1.510）,and it is easier to obtain high sensing sensitivity,with the maximum sensitivity of 47623.83 nm/RIU.When the gold nanowires and analytes are located outside the hollow fiber,they can be used to detect analytes with low refractive index（1.270-1.410）and obtain higher figure of merit more easily.The maximum figure of merit obtained is about 1500.00 RIU^-1.