A Tunable Metasurface with Switchable Functionalities: From Perfect Transparency to Perfect Absorption,Advanced Optical Materials

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A Tunable Metasurface with Switchable Functionalities: From Perfect Transparency to Perfect Absorption
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2020-01-15 , DOI: 10.1002/adom.201901548
Yue Li ₁ , Jing Lin ₂ , Huijie Guo ₂ , Wujiong Sun ₂ , Shiyi Xiao ₁ , Lei Zhou ₂

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A thin screen exhibiting dynamically switchable transmission/absorption functionalities is highly desired in practice. However, a trilayer transmissive metasurface with active elements controlled in a uniform manner cannot exhibit independently controlled transmission and absorption properties due to intriguing interplays between the scattering and absorbing properties in systems exhibiting inversion symmetries. This motivates to employ the coupled‐mode theory to establish a generic phase diagram for such transmissive metasurfaces with active elements loaded in different layers tuned independently and to guide researchers design tunable metadevices with completely decoupled transmission/absorption responses. Based on such a phase diagram, a microwave metasurface is designed/fabricated with PIN diodes incorporated, and it is experimentally demonstrated that its functionality can switch from perfect transparency to perfect absorption, controlled by external voltages applied across the diodes. In addition to finding immediate applications in practice (e.g., smart radomes), the results of this study also provide a new type of tunable meta‐atom for building metasurfaces with flexible wave‐front control abilities.

中文翻译：

具有可切换功能的可调超颖表面：从完美的透明度到完美的吸收

在实践中非常需要具有动态可切换的传输/吸收功能的薄屏幕。但是，由于在表现出反对称性的系统中，散射和吸收特性之间的相互吸引作用，具有以均匀方式控制的活性元素的三层透射超表面不能显示出独立控制的透射和吸收特性。这激发了使用耦合模式理论来为此类透射形超表面建立通用相图的作用，其中有源元件分别加载在不同的层中，并且可以指导研究人员设计具有完全解耦的传输/吸收响应的可调形元器件。根据这样的相图，设计/制造了带有PIN二极管的微波超表面，实验证明，其功能可以通过二极管两端施加的外部电压控制，从完美的透明性转变为完美的吸收性。除了在实践中发现直接应用（例如，智能天线罩）外，这项研究的结果还提供了一种新型的可调谐超原子，用于构建具有灵活的波前控制能力的超颖表面。

更新日期：2020-03-20

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