论文标题
可调和宽带连贯的完美吸收剂，具有基于非对称双面石墨烯元面的非线性和扩增性能
Tunable and broadband coherent perfect absorbers with nonlinear and amplification performance based on asymmetric bifacial graphene metasurfaces
论文作者
论文摘要
我们提出了一个不对称的双面石墨烯元面，以实现Terahertz（THZ）频率的可调和宽带相干的完美吸收（CPA）。所提出的设计由两个不同的石墨烯平方贴片元面积组成，该贴片堆叠在超薄介电底物上。非线性CPA性能在不诉诸光学非线性和扩增的情况下，根据沿着该亚波长结构发生的波浪干扰现象证明了这一点。在单波照明的情况下，从相对方向获得了宽带不对称反射。当额外的输入波与相反的传播入射波相互相互作用时，该响应是提出的可调和宽带非线性CPA性能和对吸收（即放大）的反响应的前体。提出的超薄宽带CPA设备有望成为几种新的芯片THZ通信设备的重要组成部分，例如光学调节器，传感器，光电探测器和全光值小信号放大器。
We present an asymmetric bifacial graphene metasurface to realize tunable and broadband coherent perfect absorption (CPA) at terahertz (THz) frequencies. The proposed design is composed of two dissimilar graphene square patch metasurfaces stacked over an ultrathin dielectric substrate. Nonlinear CPA performance without resorting to optical nonlinearities and amplification are demonstrated based on wave interference phenomena taking place along and inside this subwavelength structure. Broadband asymmetric reflection from opposite directions is obtained in the case of single wave illumination. This response acts as a precursor to the presented tunable and broadband nonlinear CPA performance and the inverse response to absorption, i.e., amplification, when an additional input wave coherently interacts with the opposite propagating incident wave. The proposed ultrathin broadband CPA device is expected to be a vital component to several new on-chip THz communication devices, such as optical modulators, sensors, photodetectors, and all-optical small-signal amplifiers.
