Pisano Giampaolo, Ade Peter A R, Tucker Carole
Appl Opt. 2016 Jun 20;55(18):4814-9. doi: 10.1364/AO.55.004814.
Our work relates to the use of metamaterials engineered to realize a metasurface approaching the exotic properties of an ideal object not observed in nature, a "magnetic mirror." Previous realizations were based on resonant structures that implied narrow bandwidths and large losses. The working principle of our device is ideally frequency-independent, it does not involve resonances and it does not rely on a specific technology. The performance of our prototype, working at millimeter wavelengths, has never been achieved before and it is superior to any other device reported in the literature, both in the microwave and optical regions. The device inherently has large bandwidth (144%), low losses (<1%), and is almost independent of incidence angle and polarization state, and thus approaches the behavior of an ideal magnetic mirror. Applications of magnetic mirrors range from low-profile antennas, absorbers to optoelectronic devices. Our device can be realized using different technologies to operate in other spectral regions.
我们的工作涉及超材料的应用，这种超材料经过精心设计，以实现一种超表面，使其接近自然界中未观察到的理想物体的奇异特性，即“磁镜”。以前的实现方式基于共振结构，这意味着带宽窄且损耗大。我们装置的工作原理在理想情况下与频率无关，不涉及共振，也不依赖于特定技术。我们的原型在毫米波波长下工作，其性能前所未及，在微波和光学领域均优于文献中报道的任何其他装置。该装置固有地具有大带宽（144%）、低损耗（<1%），并且几乎与入射角和偏振态无关，因此接近理想磁镜的行为。磁镜的应用范围从低剖面天线、吸收器到光电器件。我们的装置可以使用不同技术来实现，以便在其他光谱区域工作。
