鲁棒大尺寸太赫兹隐身
Robust large dimension terahertz cloaking
摘要：
隐形衣不仅吸引了人类的想象力，而且在光学和光子学方面也有着迷人的应用前景。通过用超材料操纵电磁波，研究人员已经能够实现微波、太赫兹和光学领域的电磁隐身。然而，基于超材料的隐身衣复杂的设计和制造工艺、窄的带宽和高的固有损耗对其实际应用施加了难以克服的限制。目前正在寻求新的办法来克服这些已知的不利因素。在这里，通过使用均匀的蓝宝石晶体，我们展示了第一个均匀的隐形斗篷在太赫兹频率下工作。太赫兹隐身器件具有隐蔽体积大、损耗低、带宽宽等特点。特别地，它能够隐藏尺寸比其光刻对应物大近一个数量级的物体，但不涉及复杂且耗时的洁净室处理。这种同质隐形斗篷可能会导致新的太赫兹光子器件可能用于医学，雷达和通信。
英文摘要：
Invisibility cloaking not only catches the human imagination, but also promises fascinating applications in optics and photonics. By manipulating electromagnetic waves with metamaterials, researchers have been able to realize electromagnetic cloaking in the microwave, terahertz and optical regimes. Nevertheless, the complex design and fabrication process, narrow bandwidth, and high intrinsic losses in the metamaterial-based cloaks have imposed intractable limitations on their realistic applications. Seeking new approaches to overcome these perceived disadvantages is in progress. Here by using uniform sapphire crystal, we demonstrate the first homogenous invisibility cloak functioning at terahertz frequencies. The terahertz invisibility device features a large concealed volume, low loss, and broad bandwidth. In particular, it is capable of hiding objects with a dimension nearly an order of magnitude larger than that of its lithographic counterpart, but without involving complex and time-consuming cleanroom processing. Such homogenous invisibility cloaks may lead to novel terahertz photonic devices potentially used in medicine, radars, and communications.
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