Design And Study Of Dielectric-loaded Hybrid Surface Plasmon Waveguide

With the development of electronic science and technology,the density of integrated circuits need to be improved to satisfy peoples'increasingly demanding.Surface plasmons with the advantage of compression the light field to below the diffraction limit,have attracted the attention of researchers at home and abroad.It is well known that surface plasma waveguides are the basis for photonic loop and optical manipulation at nanometer scale.However,how to make up for the shorter transmission distance due to ohmic loss under the condition of ensuring the strong local area of the surface plasma field has been a key issue for surface plasmon waveguide research.Based on the above issues,this paper first compares the differences between the key parameters of surface-plasma critical transmission parameters of medium-metal?IM?and metal-medium-metal?MIM?waveguides,and optimizes the transmission performance of the IM waveguide.Then a novel hybrid surface plasmon waveguide structure was designed based on hybrid theory.While ensuring the locality of mode field height,the transmission performance of this kind of waveguide structure was greatly improved.Finally,a laminated periodic hybrid surface plasmon waveguide was designed by using the cell cycle structure.The specific research includes the following four aspects:1.The definition,basic properties,excitation methods and applications of Surface plasma excitation are introduced.Then the key parameters of the transmission properties of the surface plasmon waveguide and the choice of materials were described.Finally,the types of surface plasmon waveguides,research significance,and latest developments in research at home and abroad were highlighted.2.The effective refractive index coefficient,mode area and transmission distance of the strip dielectric surface-loaded surface plasmon waveguide with IM and MIM structures are compared with finite element method.Then the structural and dielectric constant parameters of the IM structure waveguide are optimized in order to get the structural parameters under the best transmission characteristics.It was found that the IM structure waveguide has a longer transmission distance than the MIM structure waveguide.The optimization results of the IM structure waveguide show that when the thickness of the dielectric layer is set to 300 nm and the thickness of the metal layer is set to 200 nm,the transmission characteristics of the IM structure waveguide are the best,and the transmission distance can reach up to 37?m.3.A new type of hybrid surface plasmon waveguide is proposed,that is,inserting a low-index dielectric strip between two metal strips,covering the strip with the material,and finally covering the uppermost layer with a higher refractive index.It is found that the hybrid waveguide can not only localize the surface plasmon-electromagnetic field in the lower refractive index silica dielectric layer between the metal strips,but also the transmission distance of the hybrid waveguide compared to the traditional MIM Waveguide increased 17 times.Finally,the new hybrid waveguide designed is optimized for size and dielectric constant.Under the condition of keeping the local electric field height,the transmission distance of the optimized structure can be increased by 2 times,and the maximum transmission distance can reach 405.31?m,which is 11 times the maximum transmission distance of the optimized IM structural waveguide.The design idea of the hybrid surface plasmon waveguide provides a reference and basis for the further manipulation of the surface plasmon for light transmission.On this basis,a new dual-channel hybrid surface plasmon waveguide was also proposed.It was found that the waveguide can support surface plasmon polaritonswith a transmission distance that is twice that of the new hybrid surface plasmon waveguide.This manipulation of the effective modes of surface plasmon polaritons can be used in integrated optical circuits,high-density electronic devices and other fields.4.A laminated periodically hybrid surface plasmon waveguide with MIM and anisotropic metamaterials is proposed.The waveguide dielectric layer is partially composed of periodic and alternating combinations of Si and SiO₂.The influence of the fill factor on the transmission performance of the waveguide is studied under the condition that the waveguide is fixed on the outer ridge of the dielectric layer.The results of the study show that the performance of the entire waveguide can be changed by adjusting the fill factor under the width and height of the fixed waveguide.This is something that conventional waveguides cannot achieve.