Simulation Research On Sensing Mechanism Based On Graphene Surface Plasmon Resonance

As environmental and health issues become more and more important,sensing technology are increasingly demanded.Graphene,as an excellent two-dimensional material,has attracted the attention of researchers and in-depth study of its application in various aspects.This thesis is to simulation study the sensing mechanism based on graphene surface plasmon resonance,as follows:Firstly,the research status of graphene surface plasmon sensor,the basic theory of graphene correlation,the theoretical basis and performance measurement index based on surface plasmon resonance(SPR)sensing are introduced.From the perspective of simulation,the modeling and simulation of graphene in electromagnetic simulation software is introduced.Secondly,two graphene-based high-sensitivity reflective sensor structures were studied.The sensitivity of the resonant valley caused by the coupling resonance between the single graphene and the graphene layer is as high as 8000 nm/RIU.Further,a graphene strip was added to produce a dual-resonance valley refractive index sensor with a sensitivity as high as 7800 nm/RIU,and its FOM was higher than that of a single strip structure.Attempts have also been made to investigate the potential of dual-resonance troughs for the simultaneous detection of two substances.Both types of sensors have ultra-high sensitivity,and have the advantages of simple structure and adjustable working range.Thirdly,after briefly introducing the surface plasmon properties of the graphene waveguide,two waveguide-type sensing structures with higher quality factors based on infinite width and ultra-narrow strips are proposed.On the one hand,by studying the sensing performance of an infinitely wide graphene waveguide structure,the sensitivity is 2400 nm/RIU and the FOM is 9.6.On the other hand,a sensing structure based on coupling between an ultra-narrow graphene strip waveguide and an elliptical cavity is proposed.The performance of the sensor applied to refractive index sensing was studied.The sensitivity of the optimized parameters was as high as 2838.88 nm/RIU and ultra-high FOM=1013.88.Of course,the two sensor structures are relatively simple,and the sensing frequency band and performance parameters can be adjusted by applying a voltage.In short,the research difficulties and innovations of traditional sensors generally lie in how to further improve the performance.After briefly introducing and expounding the research status in this field,this paper studies and analyzes the reflective and waveguide types based on the unique photoelectric properties of graphene.There are four different sensor structure configurations in the two types.The focus is on a dual strip reflective index sensor with high sensitivity and multiple detection potential and a nanographene strip waveguide sensor with high quality factor.Not only the performance of the sensor is improved in performance,but also the potential of the graphene sensor based on multiple detection angles.