| As a very special electromagnetic wave,surface plasmon polaritons(SPPs)are characterized by their wide applicability.Surface plasmon polaritons is a non radiative electromagnetic model formed by the interaction of the incident photon with the free electrons of the metal surface.In surface plasmon polaritons,the most basic characteristic parameters are wavelength,propagation length and penetration depth.The characteristic parameters can reflect the basic characteristics of surface plasmon excitation element,so that the surface plasmon characteristics of element is great advantage for the study,so it is the realization of surface plasmon excitation,and the application of the important parameters for reference control.At present,how to effectively control the surface plasmon size of nano size has become the focus of researchers in this field.The new resonant cavity structures have been extensively studied.Putting forward a model based on metal insulator metal(MIM)waveguide resonant cavity structure,and through the perfect plasma induced absorption(PIA)to achieve a simple system effect,consists of two rectangular cavity side coupled to the waveguide and the barrier metal insulator metal.Secondly,the finite difference time domain(FDTD)method is used to calculate the propagation properties of the system and the theoretical explanation of the three level surface plasmon system.This paper presents and proves that the broadband absorption window will be split into two windows and a rectangular resonant cavity will be added,and its physical mechanism will also be presented.At the same time,multiple switch.ing effects are also found.It is found that the proposed new structure has potential applications in highly integrated optical circuits and can be fabricated simply.The study also shows that achieving perfect plasmon absorption can be achieved in a simple subsystem consisting of two rectangular cavities.The bright resonator,which can be coupled to the metal insulator metal waveguide,and the dark resonator,because it can not be excited by the metal insulator metal waveguide.However,dark modes can be excited by bright modes and by near coupling.The destructive interference between bright and dark modes in this paper leads to a perfect plasmon absorption effect.It is found that the original broadband absorption window can be divided into two windows to add a rectangular cavity.In consideration of this metal insulator metal(MIM)waveguide resonant cavity structure,obviously,simple structure proposed has potential application prospect compared with other resonant cavity structure in optical switch,filter and high integrated optical splitter,the structure is more simple,functional diversification.A novel compact plasma waveguide system consisting of a single cut and a disk is proposed.The single cut waveguide is directly coupled,and the disk is indirectly coupled.Compared with the previous structure of Lai and other double disk systems,the structure coupling coefficient of this paper is higher and the quality factor is larger.By means of theoretical analysis and numerical simulation,the electromagnetically induced transparency spectrum in a waveguide system consisting of single incisions and disks is investigated.The results show that the direct coupling of single incision and the indirect coupling of disc formation can cause plasma induced transparency spectrum reaction.Through the realization of the FP cavity,the structure of higher quality factor Q is obtained,and the superiority of the structure is improved by changing its geometric parameters.Then the temperature effect is studied to realize the design of temperature sensor based on metal dielectric metal(MDM)structure plasmon induced transparency effect.Both the coupled mode theory and the F-P model agree well with the numerical simulation of FDTD.Therefore,we believe that the plasma waveguide system may have potential applications in highly integrated optical circuits such as nano optical switches,plasma sensors and slow light devices. |
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