凹槽导体上的表面等离激元SPPs传输特性研究

Studies of surface plasmon polaritons on periodic groove conductor

紫外段的光波从空气里入射到导体上,除部分光被反射,导体同时也对光波进行了宽带吸收而产生溅射的表面等离激元SPPs,SPPs在导体表面产生了亚波长约束可形成强电场,其有超衍射、敏感传播面上的细微变化、磁响应增强等特色性能.文章采用Maxwell电磁场方程组,对紫外段光波在导体传播面上产生的等离激元SPPs机制、刻有一维周期凹槽导体上的微波段SPPs传输色散特性,进行了推导、计算,仿真出三维凹槽同轴波导的场分布,得出了在符合波矢匹配条件下,可把微波段的导行电磁波,通过波导的亚波长周期凹槽转化成SPPs传输.

In addition to the reflection of part of the light,the conductor also absorbs the light wave in a wide band and produces a surface plasmon SPPs,which creates a subwavelength constraint on the surface of the conductor to form a strong electric field.In this paper,the generation mechanism of the plasmon SPPs on the propagation surface and the dispersion characteristics of the spoof SPPs with one-dimensional periodic groove conductor are discussed by using Maxwell electromagnetic field equations and the field distribution of three-dimensional coaxial waveguide with subwavelength periodic grooves is simulated.Under the condition of matching the wave vector and impedance,the incident electromagnetic wave in the microwave band can be transformed into a mixed wave through the subwavelength periodic grooves of the waveguide transmission line,and then smoothly converted into SPPs for transmission to another the port where it ensures the efficient transmission and conversion of microwave energy.