Design And Characteristic Optimization Of Optical Filters Based On Surface Plasmon Polaritons

Surface plasmon polaritons(SPPs)is a special electromagnetic form trapped on the interface of metal and insulator.It spreads along the surface of metal,whose strength is exponential decay at the direction perpendicular to the interface.It has huge potential as a information carrier and will be widely used in future optical communication system.It can overcome the diffraction limit in the field of traditional optics and confine the electromagnetic energy in a sub-wavelength limit,and its propagation length is farther.Optical devices based on surface plasmon polaritons have the advantage of a high-speed response and a nano-scale size.It provide the possible to realize the high-speed all-optical devices in nanoscales.In the communication systems,the frequency band and wavelength selection is a vital technology.It is significant for the high integration of the future optical communication systems to design and realize the sub-wavelength optical tunable filters utilizing the properties of surface plasmon polaritons.In this paper,we conduct a study of narrow band tunable filters based on surface plasmon using finite-element-method(FEM)in MIM structrue.The whole paper is divided into the following three sections:1?Introduced the background and significance of research contents?the study process and adhibition of SPPs.Deduced the formula of metal's Drude mode briefly.Brief introduced waveguiding structure based on SPPs.Elaborated the more useful three-layers structure:metal-insulater-metal.Brief introduced the insulator-metal-insulator structure.Brief described an important role of optical resonator in surface plasmon filters and listed the designed nano-filters structure at this stage.2?Starting from meeting the match condition of the wave vector,introduced the way to stimulate SPPs.3?Firstly brief introduced the dispersion equation of MIM waveguide.Introduced the filter structure based on side-coupled tooth and rectangle cavity.Intensively introduced Double-Sided Tooth-Disk Waveguide Filters Based on Plasmon-Induced Transparency.Analyzed the influence of the tooth's length and the disk's radii on the characteristic of the structure.Simulation results show that plasmon-induced transparency(PIT)occurs in the transmission spectra,and the sharp asymmetric Fano lines increase the sensitivity to 1.4×103nm/RIU.Moreover,we find that the PIT only happens when the staggered system is around a fixed location with different separate distances,not periodical,which is not similar to the previous researches.This model may be important to photonic-integrated circuits and the sensitivity in sensors.Also analyze the transmissivity when the single disk at different location.On this basis,proposed a double-sided disk structure,and conducted a simple simulation.In conclusion,we proposed double-sided tooth-disk and double-sided disk structure by pre-research on tooth?rectangle and disk cavity.It can realize band-pass filter?band-stop filter and sensor and we analyze these structures theoretically and emulationally.Our paper has given a theoretical basis to further design and improve tunable narrow-band filter and sensor.Meanwhile,it also has a reference value for the simulation and design of optical devices based on micro and nano scale.