We propose and analyze a multifunctional THz graphene-based component with graphene elements placed on a dielectric substrate. The structure of the device consists of a disc shaped resonator coupled to three graphene waveguides that excite the dipole or quadrupole resonance of surface plasmon polaritons in the resonator. The graphene resonator can be magnetized by a DC magnetic field. This device fulfills filtering of the input signal and can be used as a power divider and also as a switch. The division mechanism of the T-junction can be provided by application of a DC magnetic field or by changing the Fermi energy of the graphene resonator via an electrostatic field. Some peculiarities of the two mechanisms are discussed. Numerical simulations show that for a central frequency of 7.12 THz, devices in the OFF state have the two output ports isolated from the input port at a central frequency of about 27 dB provided by the dipole mode resonance. In the ON state and the division regime, the transmission to the output ports is around ${-}(4\div5) \;{\rm{dB}}$ in the 3-dB bandwidth of about 12%.

中文翻译：

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基于偶极-四极和磁光共振效应的石墨烯太赫兹滤波器-开关分频器

我们提出并分析了一种多功能的基于太赫兹石墨烯的组件，其石墨烯元件放置在介电基板上。该设备的结构由一个圆盘形谐振器组成，该谐振器耦合到三个石墨烯波导，这些石墨烯波导激发谐振器中表面等离子体激元的偶极子或四极子谐振。石墨烯谐振器可以被直流磁场磁化。该器件完成输入信号的滤波，可用作功率分配器，也可用作开关。T 型结的分割机制可以通过施加直流磁场或通过静电场改变石墨烯谐振器的费米能量来提供。讨论了这两种机制的一些特点。数值模拟表明，对于 7.12 THz 的中心频率，处于关闭状态的设备的两个输出端口与输入端口隔离，中心频率约为 27 dB，由偶极子模式谐振提供。在 ON 状态和除法状态下，到输出端口的传输大约是${-}(4\div5)\;{\rm{dB}}$在 3-dB 带宽下约为 12%。