The Basic Study Of The Surface Plasmon Waveguide

In recent years, the traditional medium integrated optic components have bottleneck in miniaturization and integration because of the limit of the diffraction. The surface Plasmon could highly confine the energy at the surface between of the metal and dielectric. It's the focus of the research and hoped to be used in nanometer components and circuits. This dissertation stars from the Maxwell equations , introduces the basic concepts of the surface Plasmon, discusses the existing condition and the expression of the surface Plasmon, points that the essential of the surface Plasmon is the bound charge density wave, the density of charge at the surface of the metal fluctuates. The charges surge together and radiate electromagnet ism. Also analyzes the loss of the surface Plasmon is the ohm loss caused by the interaction between the photon and the Plasmon. When the frequency of photon is matching the frequency of Plasmon, the surface Plasmon resonance happens, and the loss reaches the maximum. If there is a gain dielectric, despite couldn' t completely compensate the loss caused by the metal, it can weaken the loss.This dissertation analyzes the basic modes and characteristics of the two types of three-layer symmetrical waveguide structures: metal-dielectric-metal (MIM) and dielectric-metal-dielectric (IMI), and also compares the two structures. The former structure has better confinement, but having bigger loss simultaneity. Based on the characteristics of the two structures and the dielectric waveguide, proposes a highly confined channel structure. This structure has high confinement in two dimensions, when the cross section of the core is 200nm×800nm, the confinement factor is as high as 98.5%, the lateral mode size is approximate with the width of the core. In addition, this dissertation points the metal particle array structure also could be the carrier of the surface Plasmon, analyzes the single row array and two-row array, and points the contact between the confinement,loss and the field enhanced effect. Proposes the interlaced metal particle arrays as the 1×2 (400nm×250nm), 1×3 (500nm×350nm) splitter in nanometer size.