Research On The Sensing Theory And Application Of The Mixed Metal Surface Plasmon Device

Surface plasmon have been widely used in the field of sensing, optoelectronic devices, bio-pharmaceuticals and so on due to its unique properties. In the field of sensing, surface plasmon resonance sensors have the advantages of high sensitivity and detecting convenience. The Tamm state as a new type of metal surface plasmon is more easily excited and has a stronger light field locality, which have been applied for sensors. The two surface electromagnetic wave have its advantages. However, most of the existing structures can only excite one of them. A structure which has the two characteristics and can excite both surface plasmon and Tamm state simultaneouslyneed further study.We proposed three kinds of photonic structures based on the excitation conditions of surface plasmon and Tamm state. The three photonic structures can excite surface plasmon polaritons and Tamm plasmon polaritons simultaneously. And the characteristics of the photonic structures are investigated by analyzing the reflection spectrum and electromagnetic field distribution. Finally, the application of photonic structures is studied as an example in the field of sensing, which provides the methodology for dual parameter sensing in a wide measurement range The photoic structures support multiple resonance mechanisms which have strong dependence of the tilt angle and the polarization state of incident light beam can be potentially applied for dual parameter measurement.The contents and conclusions of this work are as follows:Firstly, the photonic structures of MDM-DBR, MM-DBR and CM-DBR were proposed based on the excitation conditions surface plasmon and Tamm states. Then we discuss the reflection spectrum and normalized electromagnetic field distribution of the three structures. The results indicate that MDM-DBR structure can excite propagating surface plasmon resonances, localized surface plasmon resonance and optical Tamm state; MM-DBR and CM-DBR structures can only excite localized surface plasmon resonance and optical Tamm state.Secondly, the six parameters of the center wavelength of DBR:the period of metal grating, the width of the metal nanowires, the height of metal grating, the thickness of metallic Ag film and the thickness of dielectric, have been changed to study the variation of photonic structures by analyzing the reflection spectrum and the electromagnetic field distribution. Furthermore, the coupling between surface plasmon and Tamm state is discussed.Finally, we studied the application of the photonic structures mentioned above in terms of sensing as an example. Dual parameter measurement can be realized by using those three structures mentioned before, which has the advantages of a wide range of measurement and high linear correlation coefficient. And we discuss the implementation of dual-parameter sensing. The ambient refractive index and dielectric layer thickness can be calculated by the resonance wavelengths of TPs and LSPs respectively when the light beam vertically incidents upon the MDM-DBR structure MM-DBR structure-excites TPswith normally incident light beam which can lead to solution of the dielectric layer thickness and the SPs can be excited with the incident TM-polarized light beam at angle of 75.7 degree which will lead to the solution of the ambient refractive index. Regrading CM-DBR structure, It can excite TPs with TE polarized light, and SPs with TM polarized light. Then two parameters were calculated through two factors.