Hyperbolic Metamaterial Devices for Wavefront Manipulation
Hyperbolic Metamaterial Devices for Wavefront Manipulation
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用于波前操纵的双曲超材料器件
DOI：
10.1002/lpor.201800081
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发表时间：
2019
影响因子：
11
通讯作者：
Chen Lin
中科院分区：
文献类型：
--
作者：
Yin Xiang;Zhu Hua;Guo Huijie;Deng Ming;Xu Tao;Gong Zhijie;Li Xun;Hang Zhi Hong;Wu Chao;Li Hongqiang;Chen Shuqi;Zhou Lei;Chen Lin
超表面已经显示出重塑电磁（EM）波的波前的巨大潜力，但是透射式Meta器件面临低效率和/或制造复杂性的挑战。在这里，提出了一种实现高效率传输模式Meta器件以控制EM波前的替代方法，该方法基于在其侧壁上支持定制欺骗表面等离子体激元（SSP）的双曲超材料（HMM）波导。通过调整HMM几何参数来操纵SSP的色散，可以控制穿过这种波导的EM波的相位，这使得能够设计具有用于特定波操纵应用的期望传输相位分布的Meta器件。通过微波实验验证了基于该机制的两种波控效应，即光束偏转和聚焦，并对反常折射光束实现了42.9%的最大转换效率。通过按比例缩小HMM Meta设备，本文的提议适用于光频率，并且原则上承诺显著提高转换效率。本文的方案可以在不使用高折射率介电材料的情况下提供更高的有效折射率和更可调谐的色散，并且因此可以用作制造具有多样化功能的高效透射Meta器件的有效且稳健的方法。
Metasurfaces have shown great potential to reshape the wavefront of electromagnetic (EM) waves, but transmissive meta‐devices face challenges of low‐efficiency and/or fabrication complexities. Here, an alternative approach to realize high‐efficiency transmission‐mode meta‐devices to control EM wavefronts, based on hyperbolic metamaterial (HMM) waveguides supporting tailored spoof surface plasmons (SSPs) on their side walls, is proposed. By manipulating the dispersions of SSPs through adjusting the HMM geometrical parameters, the phases of EM waves passing through such waveguides, which enables the design of meta‐devices with desired transmission‐phase profiles for particular wave‐manipulation applications, can be controlled. Microwave experiments are implemented to demonstrate two wave‐control effects based on the mechanism, that is, beam‐deflection and focusing, and a maximum conversion efficiency of 42.9% is achieved for the anomalous refracted beam. By scaling down the HMM meta‐devices, the proposal herein is applicable to optical frequencies and in principle promises significantly raised conversion efficiencies. The scheme herein can offer a higher effective refractive index and more tunable dispersion without using high‐index dielectric materials, and thus can serve as an effective and robust approach to make high‐efficiency transmissive meta‐devices with diversified functionalities.