Study On A Novel Surface Plasmon Waveguide Filter Characteristic

Surface plasmon(surface plasmons, SPS) is generated electron and photon in the free vibration of a metal surface in the presence of the interacting electron density wave propagation along the surface of the metal. Because of the recent local field enhancement, break the diffraction limit and other characteristics, has become a research hotspot in recent years. A variety of SPP waveguide have been reported, from the structure can be divided into metal dielectric metal(MIM) waveguide and dielectric metal dielectric(IMI) waveguide two types, of which type MIM waveguide structure and IMI type structure is compared, can realize subwavelength waveguide transmission, shorten the distance and simple preparation etc., conducive to the realization of the micro nano photonic integration. In this paper, in 400 nm to 2000 Nm wavelength range, study the influence of waveguide geometry size for the working characteristics of MIM type surface plasmon waveguide filter, and puts forward a design scheme of narrowband filter of MIM type surface plasmon waveguide structure based on.First of all, using the finite element method for analysis of transmission characteristic of MIM type waveguide based, to obtain the effective rate mode refraction and transmission length varies with the excitation wavelength and the interlayer width curve. Simulation of the transmission characteristics of branch of surface plasmon waveguide filter with based on MIM structure, the analysis results show that: the bilateral transmittance extraneousness waveguide structure curve has a wider stopband than unilateral Festival, in addition when bilateral branch location the transmittance curve passband and stopband edges will be more steep, is suitable to the design of band stop filter. On this basis, through the introduction of two to achieve the surface plasmon narrowband filter based on MIM waveguide cross type support section, and the transmittance curve by numerical calculation, the results show, stub length can affect the stopband and passband center wavelength band, stub length difference can clamp the transmission peak width. The conclusion provides a valuable reference for the design of narrow-band filters in photonic integrated circuits.