提出了一种新型MIM(金属-介质-金属)等离子光波导与二维介质平板波导耦合器结构, 该结构通过利用波导接口处的谐振效应来增大波导之间的耦合效率, 降低传输损耗。采用FDTD(有限时域差分)法进行了数值计算, 结果表明, 在波长1.55 μm处,谐振腔距离接口230 nm、深度为420 nm时耦合效率得到大幅度提高, 耦合效率比传统的耦合结构模型能够提高20%~30%。

In this paper, we present a new model for a nano-coupler between metal-insulator-metal plasmonic and dielectric slab waveguides. The model uses the resonance effect at the waveguide junction to improve the power coupling efficiency. The proposed model is demonstrated numerically by the Finite-Different Time-Domain (FDTD) method. The results indicate that when wavelength is 1.55 μm the distance between resonator with junction is 230 nm and the depth is 420 nm, where the power coupling will be improved by 20% to 30%.