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采用介质层加载的方法使表面等离子体激元(SPPs)在传输过程中获得较低的传输损耗。通过比较介质-金属-介质(IMI)和介质加载的波导,证明了此介质加载的方法可以有效地减小表面等离子体的损耗,获得更低的传播速度。然后,在硅介质和金属银中间加载一层二氧化硅来提高介质光栅中表面等离子体慢波传输的性能。通过时域有限差分法证明所提出的结构使得不同频率的入射波产生的SPPs停留在不同高度的介质中,获得很小的传播速度,并且有很小的传输损耗和强的亚波长限制。此结构在光存贮和光通信方面有着很好的应用。
The method of dielectric layer loading makes surface plasmon polaritons (SPPs) obtain lower transmission loss during transmission. By comparing the dielectric-metal-dielectric (IMI) and dielectric-loaded waveguides, it is shown that this method of media loading can effectively reduce the surface plasmon loss and achieve lower propagation velocity. Then, a layer of silica is loaded between the silicon and silver metal to improve the performance of surface plasmon slow wave propagation in the dielectric grating. The time-domain finite difference method is used to prove that the proposed structure allows SPPs generated by incident waves of different frequencies to stay in different height mediums, achieving a small propagation velocity with small transmission loss and strong sub-wavelength limitation. This structure has good application in optical storage and optical communication.