The Research On Surface Plasmon Functional Devices Based On Metal-Insulator-Metal Waveguide

Surface Plasmon Polaritons(SPPs)are special electromagnetic waves with strong local characteristics and strong conduction characteristics.In optical research,Metal-Insulator-metal(MIM)waveguide structure has lower ohmic loss and stronger transmission capacity than Insulator-metal-Insulator(IMI)waveguide structure,now it has become an important direction in optical research.Plasmon waveguide filter device based on plasmon are one of the largest research fields in micro-nano optics,and it has been widely used in many fields,the plasma waveguide is a transmission linear structure capable of transmitting specific signals.Because of its excellent local characteristics and transmission characteristics.Therefore,it can be perfectly combined with filtering.This paper mainly researchs the propagation characteristics of the MIM waveguide structures in micro-nano optoelectronics,and researchs the application of the combination of the optical filter characteristics,by controlling the transmission function of the waveguide and the local function of the resonant cavity,solve the problem of transmission energy loss of the MIM waveguide filter existing at this stage.The main research work is as follows:1.A MIM waveguide structure based on an asymmetrical circular resonator is proposed,and the coupling effect of SPPs is strengthened by the circular resonator of the structure,and the filtering characteristics are studied based on this phenomenon.By comparing the two structures of the asymmetric semicircular cavity MIM waveguide and the asymmetric circular cavity MIM waveguide,it is concluded that the asymmetric circular cavity can improve the coupling efficiency of light and obtain a higher stop band.2.According to the method of asymmetric structure,a square resonator cavity coupled metal waveguide structure is proposed.The transmission response of the nanoscale system composed of a square resonator and a waveguide is numerically analyzed and verified by simulation with FDTD solutions.By studying the comparison between square resonator and circular ring resonator,the square resonators have better filtering characteristics and higher quality factors,studies have shown that changing the side length,refractive index,and resonance distance of a square resonator changes the transmission response of the filter structure can reduce its half-wave width(FWHM).In addition,a non-symmetrical square resonator cavity waveguide structure is designed,which can realize the dual-circuit switching characteristics.3.According to the above structure,an all-optical plasma switch constructed based on a square resonator-coupled metal waveguide structure is proposed,which can realize bidirectional switching characteristics.By optimizing the structural parameters,better optical switching characteristics can be obtained,including higher transmission efficiency and lower stopband transmittance.