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首页> 外文期刊>IEEE Transactions on Magnetics >Dynamically Controllable Terahertz Graphene Y-Circulator
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Dynamically Controllable Terahertz Graphene Y-Circulator

机译：动态可控的太赫兹石墨烯Y循环器

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摘要

A new type of the graphene-based three-port circulator for the terahertz (THz) region is suggested and analyzed theoretically. The cross section of the component presents a three-layer structure consisting of the layers of graphene, silica, and silicon. The in-plane figure of the circulator consists of a circular graphene resonator and three waveguides symmetrically connected to it. The resonator is magnetized normally to its plane by a dc magnetic field. The working principle of the device is based on the dipole resonance of the magnetized graphene resonator. The numerical simulations are fulfilled by a full-wave computational program. For the analysis of the circulator, the analytical temporal coupled mode theory and circuit theory are also used. Numerical calculations demonstrate the isolation greater than -15 dB and the insertion loss better then -3 dB within the bandwidth of about 7.4% and the central frequency of 5.38 THz. At this frequency, the minimum of the insertion losses is -2.65 dB, and the maximum of isolation is -40 dB. The biasing dc magnetic field is 0.45 T, and the Fermi energy is epsilon(F) = 0.15 eV. In our example, the diameter of the graphene resonator is 1.2 mu m which corresponds to 0.0215 lambda(0) where lambda(0) is the operating wavelength in the free space. The influence of geometrical and physical parameters of the circulator on its characteristics is discussed. The frequency band can be enlarged at the expense of higher dc magnetic field. The central frequency of the circulator can be adjusted by the Fermi energy of graphene through the electrostatic gating, and it allows one to control dynamically the circulator responses.
机译：提出了一种新型的基于太赫兹（THz）区域的基于石墨烯的三端口环行器，并进行了理论分析。组件的横截面呈现出由石墨烯，二氧化硅和硅层组成的三层结构。环行器的平面图由一个圆形石墨烯谐振器和与其对称连接的三个波导组成。谐振器被直流磁场垂直磁化到其平面。该装置的工作原理基于磁化石墨烯谐振器的偶极谐振。数值模拟由全波计算程序完成。对于环行器的分析，还使用了分析时间耦合模式理论和电路理论。数值计算表明，在约7.4％的带宽和5.38 THz的中心频率内，隔离度大于-15 dB，插入损耗优于-3 dB。在此频率下，插入损耗的最小值为-2.65 dB，隔离的最大值为-40 dB。直流偏置磁场为0.45 T，费米能量为epsilon（F）= 0.15 eV。在我们的示例中，石墨烯谐振器的直径为1.2μm，对应于0.0215 lambda（0），其中lambda（0）是自由空间中的工作波长。讨论了循环器的几何和物理参数对其特性的影响。可以以较高的直流磁场为代价扩大频带。循环器的中心频率可以通过静电门控通过石墨烯的费米能量来调节，并且允许人们动态地控制循环器的响应。

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