Research On Sensing Characteristics Based On Cascade Embedded Microring Resonator

Optical microring resonators are widely used in the fabrication of sensors due to their advantages of small size,high quality factor and simple structure.In this thesis,the design of new structures and the optimization of existing micro-ring structures are studied.It is intended to improve the performance of micro-rings in sensing applications by designing the geometric structure and composition materials of new micro-ring resonators,and to simplify the manual operation through new optimization methods.The optimal design parameters of the new structure are obtained more quickly and accurately.The main research work of this thesis is as follows :Firstly,the development and research status of micro-ring resonators are introduced.The basic theory,calculation method,research method,structural calculation and performance index of micro-ring resonators are introduced,which paves the way for the later design.Secondly,an embedded micro-ring resonator based on platinum disulfide is proposed.The model of the embedded runway micro-ring resonator is established.The simulation software is used to simulate the light transmission process during the operation of the device.The structural parameters such as waveguide parameters,coupling coefficient and micro-ring radius are compared and analyzed,and the optimal results are obtained,and the device performance of the structure is calculated.Thirdly,a third-order series racetrack symmetric microring resonator model based on hybrid plasma waveguide is proposed.The output function of this structure is calculated by transfer matrix method and coupled mode theory.The waveguide slot width,racetrack resonator radius,loss coefficient,coupling coefficient and other factors affecting device performance are compared and analyzed by simulation.The selection of optimal parameters makes the device performance reach the optimal state and has a large free spectral range.Finally,on the basis of the mosaic structure and the third-order series structure,combined with the advantages of the two structures,the third-order series mosaic structure is further designed,and the mathematical theoretical model is established.The multi-objective intelligent optimization algorithm is used to replace the manual optimization.The parameters of the device are automatically solved,and the results of the automatic optimization parameters are verified and adjusted to obtain the ideal output spectral curve.The results show that the microring designed in this thesis has excellent performance when applied in sensing scenarios.In this thesis,through the theoretical and simulation experiments of microring resonator,it is proved that optimizing the structure of microring resonator is beneficial to the sensing performance of the device.Intelligent optimization algorithm can be applied to the theoretical process of microring resonator structure design,which provides a theoretical basis for the fabrication and theoretical research of new sensors.