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arXiv 2005.11876physics.opticsphysics.app-ph
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基于非对称双面石墨烯超颖表面的具有非线性和放大性能的可调谐宽带相干理想吸收体

Tunable and broadband coherent perfect absorbers with nonlinear and amplification performance based on asymmetric bifacial graphene metasurfaces

Tianjing Guo, Christos Argyropoulos

摘要:

提出了一种非对称双面石墨烯超颖表面,实现了太赫兹(THz)波段的可调谐宽带相干完全吸收(CPA)。所提出的设计是由两个不同的石墨烯方形贴片超颖表面堆叠在一个介电基板。非线性CPA性能,而不诉诸光学非线性和放大的基础上发生的波干涉现象沿和内部的亚波长结构。在单波照明的情况下,得到了两个方向的宽带非对称反射。该响应充当所呈现的可调谐和宽带非线性CPA性能以及对吸收的逆响应(即,当附加的输入波与相反传播的入射波相干地相互作用时,放大。该器件有望成为光调制器、传感器、光电探测器和全光小信号放大器等新型片上太赫兹通信器件的重要组成部分。

英文摘要:

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.

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