In this paper, we present a design principle for achieving an electrically tunable, multi-wavelength device with multiple functionalities over a single metasurface platform with minimized footprint. This concept is realized based on the integration of four metal-insulator-metal (MIM) inclusions inside a unit cell, which is configured to support four independently controllable operating channels lying in near-infrared (NIR) regime. Incorporation of newly emerged, electrically tunable indium tin oxide (ITO) into such metasurface leads to a dynamical phase modulation over the reflected light. As a result, the phase tunability of almost 285°, 230°, 300°, and 280° are captured at T, O, C, and U optical communications bands, under applying external bias voltages. A digital coding strategy, consisting of "0" and "1" binary bits, is employed to represent the applied biasing configuration to the sub-units. Independently controlled, decoupled gap plasmon resonators, with the ability of eliminating the interference between channels, are enabled thanks to the geometry optimization and careful selection of materials. A meta-array configuration is implemented, in which electrically addressing the groups of MIM sub-units opens a pathway to the tunable applications, namely Airy beam generation, beam splitting, steering, and focusing.

中文翻译：

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基于氧化铟锡的多波长电压编码超表面：独立且动态可控的近红外多通道。

在本文中，我们提出了一种设计原理，用于在单个超表面平台上以最小的占位面积实现具有多种功能的电可调多波长设备。该概念是基于单元格内四个金属-绝缘体-金属（MIM）夹杂物的集成而实现的，该单元格配置为支持位于近红外（NIR）区域的四个独立可控操作通道。将新出现的，可电调谐的铟锡氧化物（ITO）掺入此类超表面会导致对反射光进行动态相位调制。结果，在施加外部偏置电压的情况下，在T，O，C和U光通信频段捕获了大约285°，230°，300°和280°的相位可调性。一种数字编码策略，由“ 0”和“ 1”二进制位组成，用来表示施加到子单元的偏压配置。得益于几何结构的优化和材料的精心选择，能够实现独立控制的，解耦的间隙等离子体激元谐振器，并具有消除通道之间干扰的能力。实现了一种元阵列配置，其中，对MIM子单元组进行电寻址可打开通向可调应用程序的途径，即艾里光束产生，光束分离，操纵和聚焦。