Hyperbolic Metamaterials for Collimation and Subwavelength Focusing

Mina Ren, Yanhong Liu, L. Dong, Lixiang Liu, F. Deng, Yun-long Shi
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Abstract

Collimation and focusing are generally more common in optics field. We demonstrate hyperbolic metamaterials (HMMs) with very flat isofrequency surfaces in wavevector space for tunneling of electromagnetic (EM) energy, which lead to collimation and subwavelength focusing at microwave frequencies. The HMM as a transmission device has been realized by employing two-dimensional metamaterial transmission lines. In HMM operates in canalization regime, the EM waves with different incident angles were refracted in a direction. The HMMs can couple evanescent waves with high wave vectors into propagating modes, and as a result, they provide subwavelength focusing. Focusing of with the narrowest full width half maximum (FWHMs) of about 1/32 of the wavelength at 0.95GHz is confirmed. The numerical simulation and the experimental measurement show good agreement.
准直和亚波长聚焦的双曲型超材料
准直和聚焦是光学领域中较为常见的技术。我们展示了在波向量空间中具有非常平坦的等频表面的双曲超材料(hmm),用于电磁(EM)能量的隧穿,从而导致微波频率下的准直和亚波长聚焦。利用二维超材料传输线实现了隐马尔HMM作为传输器件。隐马尔模型在渠化模式下工作时,不同入射角的电磁波在一个方向上发生折射。hmm可以将具有高波矢量的倏逝波耦合到传播模式中,从而提供亚波长聚焦。在0.95GHz处,以约为波长1/32的最窄全宽半最大值(FWHMs)进行聚焦。数值模拟结果与实验结果吻合较好。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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