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设计了一种亚波长圆环形三通道金属-介质-金属(MIM)波导分解复用器。利用时域有限差分(FDTD)法,在可见光到近红外频段研究了该结构的电磁传输特性,发现满足谐振条件的电磁波可以在圆环中发生多级谐振现象。通过优化出口通道在圆环上的位置,成功实现了圆环二、三、四级谐振模式的分离功能。此外,圆环的谐振波长可以通过设置圆环的半径进行调制。该微结构对光波具有束缚与传输功能,解决了光信号谐振模式分离传输问题,在光集成与通信等方面有较好的应用前景。
A sub-wavelength circular three-channel metal-dielectric-metal (MIM) waveguide demultiplexer is designed. The electromagnetic transmission characteristics of the structure were studied in the visible to near infrared band using the finite difference time domain (FDTD) method. It was found that the electromagnetic wave satisfying the resonance condition could generate multi-level resonance phenomenon in the ring. By optimizing the position of the outlet channel on the ring, the separation function of the second, third and fourth resonance modes of the toroid has been successfully achieved. In addition, the resonance wavelength of the ring can be modulated by setting the radius of the ring. The microstructure has the function of restraining and transmitting light waves, solves the problem of separation and transmission of the resonant modes of optical signals, and has good application prospect in the aspects of optical integration and communication.