高限制等离子体表面波槽形结构

Highly Confined Channel Structure of the Surface Plasmon

基于等离子体表面波的物理机理,提出一种具有高限制因子的二维亚波长槽形结构.该结构能在二维上都限制在亚波长尺寸,其能量主要限制在芯区中,当芯区横截面尺寸为200nm×800nm,能量限制因子高达98.5%,横向模式尺寸近似于芯区宽度;当金属墙厚度大于截止厚度,横向模式尺寸能够达到深亚波长尺寸.该结构的基模分量Ex限制在芯区中,而分量Ey只在矩形介质芯区四个与金属接触的直角处被激励,并且关于x轴、y轴具有反对称性.

Based on the surface plasmon physical mechanism,a 2-dimension sub-wavelength channel structure with high confinement factor was presented,Whose size was both sub-wavelengh in 2-dimension,and the power was mainly confined in the core section.Power confinement factor was as high as 98.5 percent when the core cross section was 200 nm×800 nm.,and the lateral mode size was almost equal to the width of the core section.If the height of the metal wall was larger than the cut-off height,the lateral mode size could be deep subwavelength.The Ex field component of the fundamental mode was confined in the core section,the Ey field component only exists at the four angles formed by the metal and dielectric,being antisymmetric with respect to x and y axes.