Configuration Research Of Non-completely Wrapped Surface Plasmon Resonance Sensors

In the research of sensor-related fields,fiber optic sensors can effectively miniaturize,integrate and multi-functionalize the sensor,with the advantages that traditional electrical sensors do not have,in which the fiber optic surface plasmon resonance sensor provides new research ideas for the realization of high sensitivity,high reliability,miniaturization and easy integration of fiber optic sensors.The traditional fiber optic surface plasmon resonance sensor performance has a large correlation to the type and thickness of the metal layer,the parameters of the configuration can not be adjusted after the completion of the production,and at the same time,it is difficult to accurately control the processing accuracy during the processing,so the production is more complicated,higher cost.In this paper,we propose a new sensor configuration using microfiber,gold,and magnesium fluoride,mainly to avoid the uncertainty of performance caused by the processing process,while making the sensor configuration more simple and reducing the processing accuracy requirements.In this paper,we use the microfiber,gold,and magnesium fluoride to form a non-completely wrapped configuration.Firstly,we calculate the transmission spectral characteristics of the configuration using the transmission matrix of the thin-film theory,discuss the transmission spectral variation law from several configuration parameters,and finally,we perform the temperature sensing calculation using temperature as the sensing parameter and obtain a sensor sensitivity of about 4.355 nm/?.For the calculation of the microfiber under multimode conditions,the loss of the configuration is analyzed in its entirety using lossy mode resonance theory,which solves the problems of over-simplification and computational difficulties arising from the analysis process using the transmission matrix method.After discussing and calculating several parameters of the configuration using the lossy mode resonance theory,the results are modified based on the transmission matrix method,and sensor sensitivity of 29 pm/°C is obtained for the calculation of the temperature variation.In this paper,the configuration parameters are calculated and summarized using two different methods,transmission matrix method and lossy mode resonance theory,which are useful for tuning the sensor performance in subsequent sensor design work.These calculation results verify that the structure can be used for sensor design,and that the configuration is less difficult to process and simpler than the traditional fiber optic surface plasmon resonance sensing configuration,and that both the transmission matrix method and the lossy mode resonance theory results meet the performance requirements of sensor design,and even outperform the traditional fiber optic surface plasmon resonance sensing configuration under certain conditions.