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理论设计了带有扇环共振微腔的弯曲金属-介质-金属(MIM)波导结构,利用共振微腔结构控制表面等离子体波在扇环直角顶点处的定向传播。通过有限时域差分(FDTD)法计算带有扇环微腔结构的直波导透射率与波长关系,并计算扇环微腔结构与传播波导间的间隔对光学性质的影响,发现此微腔波导结构具有较高的透射率,可以在特定波长位置实现滤波效果。基于上述理论设计三路、四路弯曲波导结构,实现表面等离子体波在弯曲波导处的分束、全反射等定向传输特性。该结构具有极强的光束缚效应,在纳米尺度对光进行传输,解决了光信号的反射、传输问题,在光集成、光通讯、光信息处理等方面有较好的应用前景。
The bent metal-dielectric-metal (MIM) waveguide structure with fan-ring resonant microcavity is designed theoretically. The resonant microcavity structure is used to control the directional propagation of surface plasmon waves at the vertexes of the fan ring. The finite-difference time-domain (FDTD) method was used to calculate the relationship between the transmittance and the wavelength of the straight waveguide with the fan-shaped microcavity structure. The influence of the distance between the fan-shaped microcavity structure and the propagation waveguide on the optical properties was calculated. The structure has a high transmittance and can achieve the filtering effect at a specific wavelength. Based on the above theory, three-way and four-way flexural waveguide structures are designed to achieve the directional transmission characteristics of surface plasmon waves such as beam splitting and total reflection at curved waveguides. The structure has a very strong optical confinement effect, transmits the light at the nanoscale, solves the problem of reflection and transmission of the optical signal, and has better application prospects in the aspects of optical integration, optical communication and optical information processing.