Invisible devices with natural materials designed by evolutionary optimization.
Invisible devices with natural materials designed by evolutionary optimization.
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DOI：
10.1103/physreve.106.055312
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发表时间：
2022-11
期刊：
影响因子：
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通讯作者：
Bei Wu;Shuwen Xue;Zhibin Zhang;Huanyang Chen
中科院分区：
文献类型：
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作者：
Bei Wu;Shuwen Xue;Zhibin Zhang;Huanyang Chen
披上斗篷，逃离视线，这是一个由来已久的梦想。变换光学(TO)和人造超材料使这种情况成为现实，但对非均匀和各向异性材料的要求使其在实际实现中几乎不可能实现。此外，在以前的研究中，隐形只能在较窄的频率范围内构建，并且严重依赖于不可避免的材料损失。在此，作者提出了利用微波材料和范德华(VDW)材料等现实材料制作的多频各向同性隐形器件和自然双曲线隐形器件。在优化过程中考虑了固有的材料损失，使不可见性的概念更接近现实条件。为了验证该方法的稳定性，进行了全波数值模拟和解析计算，均获得了良好的隐身效果。由于简单的双层核壳结构和天然材料的结合，我们的工作为以低成本制造隐形器件提供了一个有前途的平台，并为超越TO限制的智能光子学的新实现铺平了道路。
It is a longstanding dream to put on a cloak and escape from sight. Transformation optics (TO) and artificial metamaterials turn this circumstance into reality, but the requirements for inhomogeneous and anisotropic materials make it almost impossible in practical realization. Furthermore, invisibility can only be constructed at a narrow frequency regime in previous studies and depends critically on the inescapable material losses. Here, the authors propose the multifrequency isotropic invisible devices and natural hyperbolic invisible devices using realistic materials, such as microwave materials and van der Waals (vdW) materials. The inherent material losses are taken into account in the optimization process, bringing the concept of invisibility closer to realistic conditions. To verify the stability of the proposed method, full-wave numerical simulations and analytical calculations are performed, and both obtained excellent invisibility performance. Due to the combined advantages of the simple two-layer core-shell configuration and natural materials, our work provides a promising platform for fabricating invisible devices at low cost and paves the way for new implementations of intelligent photonics beyond the limitations of TO.