Study On The Transmission Analysis Of Dielectric Localed Surface Plasmon Polaritons Waveguides

Surface Plasmon Polaritons(SPPs) is an electromagnetic wave that propagates along the metal-dielectric interface and decays along the vertical interface. SPPs is excited by the collective oscoilation of incident photons and free electrons. With the development of manufacturing technology,characters of SPPs are discovered by scientific researchers. The conventional diffraction limit can be significantly reduced using SPPs and the light can be controlled in the nano and micron SPPs structures, which is very important for the development of photonic devices. Based on the character, a large number of scientific researchers have devoted themselves to the research of waveguide structure of SPPs. The propagation loss of dielectric-loaded SPPs waveguide structure is decreased and the localization is enhanced, which makes it get more attention. Based on this, two new kinds of Dielectric-loaded SPPs waveguide structures are designed to improve the transmission property.The main research content is as follows:First, based on the background and applications of SPPs, the basic theory of surface plasmon polaritons waveguide are studied, the dispersion relation and surface plasmon polaritons waveguide propagation constants are derived, and the transmission characteristics of surface plasmon waveguides are carried out by theoretical and numerical simulation.Next, a plateau dielectric-loaded surface plasmon waveguide structures was proposed. The electric field distribution and the dependences of propagation loss and effective refractive index on the geometrical parameters of the waveguide structure are analyzed using finite element method. The results show that: adjusting the geometrical parameters can significantly improve the confinement of the SPPs fields and reduce the losses of the waveguide, so that the effective refractive index and propagation length of the waveguide can be optimized. Subwavelength optical confinement can be achieved in this kind of plasmonic waveguide, which will be applied to the research of optical integration chips and sensors.Finally, based on the plateau dielectric-loaded surface plasmon waveguide structures, a new dielectric-loaded long range surface plasmon polaritons(LRSPPs) is proposed. This structure combines the advantages of long range surface plasmon polartions and dielectric-loaded SPPs,which makes the transmission performance of this structure improved and the localization enhanced. The simulation results show that: the localization performance is better than the traditional long range surface plasmon polartions and M1 and M3 are 2.6 and 3.1 times larger than traditional long range surface plasmon polartions, respectively.