Font Size: a A A

Side-polished-fiber Based Surface Plasmon Resonance Sensor Enhanced By Dielectric Film

Posted on:2018-12-17Degree:MasterType:Thesis
Country:ChinaCandidate:X J FengFull Text:PDF
GTID:2348330536983283Subject:Optical Engineering
Abstract/Summary:PDF Full Text Request
Surface plasmon resonance(SPR)have lots of advantages,such as label free,real-time nondestructive testing and so on.SPR technology has been widely used in biology,medicine and chemical sensing field.The SPR sensor which use the side polished fiber(SPF)as the substructure,can greatly motivate the SPR effect by taking advantage of the evanescent field,also has many merits such as small volume,good flexibility,online-real-time transmission and so on.Research shows that the optical mode field of SPR sensor can be enhanced by adding specific dielectric film on the conventional SPR structure,thus can effectively improve the SPR performance.In this paper,the SPF-SPR sensor enhanced by dielectric film are proposed.The theoretical analysis of their producing mechanism and performance characteristics are used to design optimal structure.The main contents in this paper are as follows:The first chapter is an introduction.We reviewed the development of SPR technology,the advantage of SPF and the SPR performance parameters,to draw out the shortage of conventional SPR,then we introduced the analysis research status of single dielectric film enhanced SPR(long-range SPR)and multi dielectric film enhanced SPR(the buffer layer of photonic crystal improved SPR).Meanwhile,we proposed a more comprehensive SPR performance parameter called figure of merit.So we proposed the study of the SPF-SPR sensor enhanced by dielectric film.The second chapter is about the theory and method of SPR sensing.We introduced the producing transfer matrix method to deduce the analysis on buffer layer dielectric film enhanced SPR sensors.The third chapter is the simulation and optimization of magnesium fluoride enhanced long range SPR sensor.According to the theory of long range SPR,the long range SPR sensor based on SPF with buffer layer of magnesium fluoride was proposed,and the theoretical calculation indicates that when the refractive index of surrounding medium ranges from 1.333 to 1.363,the sensitivity of optimal structure is 3201 nm/RIU,it is 1.1 times as the SPF-traditional SPR,the FWHM is 27.2 nm,decreased by 12.3% when compared with SPF-traditional SPR,and the figure of merit can reaches 117 RIU-1,it is 1.26 times as the SPF-traditional SPR.The fourth chapter is the preparation of magnesium fluoride enhanced long range SPR sensor and refractive index sensing experiment.The optimal structure of long range SPF-SPR sensor with buffer layer of magnesium fluoride was manufactured,the experimental results show that when the refractive index of surrounding medium ranges from 1.333 RIU to 1.360 RIU,the sensitivity of the structure is 1603 nm/RIU,it is 1.05 times as traditional SPF-SPR,the FWHM is 47.8 nm which is decreased by 7.7%,comparing with the traditional SPF-SPR,and the figure of merit can reaches 33.54 RIU-1 which is 1.14 times as the traditional SPR based on SPF.The fifth chapter is the simulation and optimization of photonic crystal enhanced SPR sensor.In the theory of Photonic crystals enhancement principle,the SPR sensor based on SPF with 1-D Photonic crystals and graphene was proposed.The theoretical calculation idicates that when the refractive index of surrounding medium ranges from 1.333 to 1.363,the sensitivity of optimal structure is 2261 nm/RIU,decreased by 22.3% when compared with traditional SPR based on SPF,the FWHM is 9.4 nm,decreased by 69.7% when compared with traditional SPR based on SPF,and the figure of merit can reaches 240.53 RIU-1,it is 2.56 times as the traditional SPR based on SPF.And then,we proposed the study of photonic crystal and graphene enhanced SPR sensor,the theoretical calculation idicates that when the refractive index of surrounding medium ranges from 1.333 to 1.363,the sensitivity of optimal structure is 2121 nm/RIU,decreased by 27% when compared with traditional SPR based on SPF,the FWHM is 10.4 nm,decreased by 66.4% when compared with traditional SPR based on SPF,and the figure of merit can reaches 204 RIU-1,it is 2.17 times as the traditional SPR based on SPF.To summarize up,the proposed new types of structures of the dielectric film layer enhanced SPR sensors can achieve higher detection precision and figure of merit.Thereinto,long range SPR sensor in simulation part is 1.22 times as the traditional SPR based on SPF.Long range SPR sensor which in experiment part is 1.14 times as the traditional SPR based on SPF.The photonic crystal enhanced SPR sensor is 2.17 times as the traditional SPR based on SPF.Thus,the the side-polished-fiber SPR sensor enhanced by dielectric film which are proposed in this paper have great research value and development potential.These structures can be expected to be used in chemistry and biology application.
Keywords/Search Tags:Surface Plasmon Resonance, Side Polished Fiber, Dielectric Film, Magnesium Fluoride, Long Range Surface Plasmon Resonance, Photonic Crystal, Graphene
PDF Full Text Request
Related items