论文标题
具有动力控制的THZ石墨烯W形循环器
THz graphene W-shaped three-port circulator with dynamical control
论文作者
论文摘要
我们提出了一个新的基于石墨烯的THZ循环器。它由一个圆形石墨烯谐振器和放置在稀释式底物上的W-几何的三个石墨烯纳米伯型波导组成。表面等离子体 - 果龙波在波导中传播。纳米替孔在谐振偶极子共振中激发。该设备的非交流性是由磁化石墨烯的电导率张量的非对称性定义的。具有中央频率7.5 THz的循环器的带宽为4.25 \％，用于隔离-15 dB，插入损失-2.5 dB。应用的直流磁场为0.56T，石墨烯的费米能$ε_f= 0.15 $ eV。费米能量允许一个人动态控制循环器响应。
We propose a new graphene-based THz circulator. It consists of a circular graphene resonator and three graphene nanoribbon waveguides of W-geometry placed on a dilectric substrate. Surface plasmon-polariton waves propagate in the waveguides. The nanoribbon excites in the resonator dipole resonance. Nonreciprocity of the device is defined by nonsymmetry of the conductivity tensor of the magnetized graphene. The circulator with the central frequency 7.5 THz has the bandwidth 4.25\% for isolation -15 dB, insertion loss -2.5 dB. Applied DC magnetic field is 0.56T and Fermi energy of graphene $ε_F=0.15$eV. The Fermi energy allows one to control dynamically the circulator responses.
