Active Control of Resonant Cloaking in a Terahertz MEMS Metamaterial,Advanced Optical Materials

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Active Control of Resonant Cloaking in a Terahertz MEMS Metamaterial
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2018-05-31 , DOI: 10.1002/adom.201800141
Manukumara Manjappa _{1,

2} , Prakash Pitchappa _{1,

2} , Nan Wang ₃ , Chengkuo Lee _{4,

5} , Ranjan Singh _{1,

2}

Affiliation

Metamaterials exhibiting exotic optical properties have played a significant role over the years in guiding the concept of invisibility cloaking from the realm of being fiction to reality. However, due to the difficulties in fabricating the 3D cloaking devices and lack of exotic plasmonic materials at terahertz (THz) frequencies, the experimental realization of cloaking phenomenon in the THz spectrum is challenging. In this work, a new mechanism for invisibility cloaking based on the resonant scattering cancellation technique in a 2D nonconcentric composite metamaterial device, consisting of a split ring resonator (SRR) and a microelectromechanical system (MEMS) reconfigurable closed ring resonator (CRR) at THz frequencies is reported. A strong magnetic interaction between the SRR and CRR eliminates the scattering effects from the SRR at its fundamental eigen mode frequency, thereby making it invisible to the incident THz wave. Further, by voltage actuation of MEMS‐reconfigurable CRR, an active switching between the visible and cloaked states of SRR structure is demonstrated. The proposed technique provides a simple design and technique for realizing invisibility cloaks by utilizing the resonant near‐field interactions in the subwavelength structures across microwave to optical frequencies, thereby circumventing the need for materials with complex geometry and exotic properties.

中文翻译：

太赫兹MEMS超材料中谐振隐身的主动控制

多年来，具有奇异光学特性的超材料在引导隐形隐身概念从虚构变为现实的过程中发挥了重要作用。但是，由于制造3D隐身装置的困难以及缺乏太赫兹（THz）频率的外来等离子体材料，在THz频谱中隐身现象的实验实现具有挑战性。在这项工作中，基于共振散射消除技术的二维非同心复合超材料装置中隐身隐形的新机制，由裂环谐振器（SRR）和微机电系统（MEMS）可重构闭环谐振器（THz）组成报告频率。SRR和CRR之间的强磁性相互作用消除了SRR在其基本本征模频率下的散射效应，从而使其对于入射的THz波不可见。此外，通过MEMS可重新配置的CRR的电压驱动，展示了SRR结构的可见状态和隐身状态之间的有效切换。所提出的技术提供了一种简单的设计和技术，它可以利用子波长结构在微波与光频率之间的共振近场相互作用来实现隐形斗篷，从而避免了对具有复杂几何形状和奇异特性的材料的需求。演示了SRR结构的可见状态和隐身状态之间的主动切换。所提出的技术提供了一种简单的设计和技术，它可以利用子波长结构中跨微波到光频率的共振近场相互作用来实现隐形斗篷，从而避免了对具有复杂几何形状和奇特性能的材料的需求。演示了SRR结构的可见状态和隐身状态之间的主动切换。所提出的技术提供了一种简单的设计和技术，它可以利用子波长结构中跨微波到光频率的共振近场相互作用来实现隐形斗篷，从而避免了对具有复杂几何形状和奇特性能的材料的需求。

更新日期：2018-05-31

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