Kaliberda Mstyslav E, Lytvynenko Leonid M, Pogarsky Sergey A
J Opt Soc Am A Opt Image Sci Vis. 2019 Oct 1;36(10):1787-1794. doi: 10.1364/JOSAA.36.001787.
We consider the scattering and absorption of a plane -polarized THz wave by an infinite periodic graphene strip grating embedded into a grounded dielectric slab. The problem is reduced to the dual series equations, which, in turn, are reduced to the singular integral equation with additional conditions. The numerical method of the solution is based on the Nystrom-type algorithm and has guaranteed convergence. We use the isotropic model of graphene with conductivity described by a scalar function obtained from Kubo formalism. The dependences of the absorption coefficient on the frequency as well as the near-field distribution are presented. They show a variety of plasmon and grating-mode resonances, which are identified and studied. Almost perfect absorption is obtained near these resonances.
我们考虑嵌入接地介质平板中的无限周期石墨烯条形光栅对平面偏振太赫兹波的散射和吸收。该问题被简化为对偶级数方程，进而又被简化为带有附加条件的奇异积分方程。求解的数值方法基于奈斯特罗姆型算法，且具有收敛性保证。我们使用石墨烯的各向同性模型，其电导率由从久保形式理论得到的标量函数描述。给出了吸收系数随频率的变化关系以及近场分布。它们展示了多种等离子体和光栅模式共振，对这些共振进行了识别和研究。在这些共振附近可获得几乎完美的吸收。
