宽带无反射元片：频率选择性传输和完全吸收
Broadband reflectionless metasheets: Frequency-selective transmission and perfect absorption
摘要：
传播的电磁波的能量可以在薄的损耗层中被完全吸收，但仅在窄频带中，如因果关系原理所示。另一方面，它似乎是没有基本的限制薄吸收层的宽带匹配。然而，已知的薄吸收器在谐振吸收带之外产生显著的反射。在本文中，我们探索的可能性，以实现一个薄的吸收层，不产生反射波在一个非常宽的频率范围内，而传输系数有一个狭窄的峰值的充分吸收。在这里，我们表明，理论和实验，宽带匹配的薄谐振吸收，不可见的反射，可以实现，如果一个相同的谐振模式的吸收阵列单元被用来创建电和磁响应。我们测试这个概念，使用手性粒子在每个单位细胞，安排在一个周期性的平面外消旋阵列，利用手性耦合在每个单位细胞，但补偿场耦合在宏观层面上。我们证明了这个概念和所提出的实现方法也可以用于创建非反射层，以完全控制透射场。我们的研究结果可以在整个电磁波谱上具有广泛的潜在应用，例如，包括完美的超紧凑滤波器和选择性多频传感器。
英文摘要：
Energy of propagating electromagnetic waves can be fully absorbed in a thin lossy layer, but only in a narrow frequency band, as follows from the causality principle. On the other hand, it appears that there are no fundamental limitations on broadband matching of thin absorbing layers. However, known thin absorbers produce significant reflections outside of the resonant absorption band. In this paper we explore possibilities to realize a thin absorbing layer which produces no reflected waves in a very wide frequency range, while the transmission coefficient has a narrow peak of full absorption. Here we show, both theoretically and experimentally, that a wide-band-matched thin resonant absorber, invisible in reflection, can be realized if one and the same resonant mode of the absorbing array unit cells is utilized to create both electric and magnetic responses. We test this concept using chiral particles in each unit cells, arranged in a periodic planar racemic array, utilizing chirality coupling in each unit cell but compensating the field coupling at the macroscopic level. We prove that the concept and the proposed realization approach also can be used to create non-reflecting layers for full control of transmitted fields. Our results can have a broad range of potential applications over the entire electromagnetic spectrum including, for example, perfect ultra-compact wave filters and selective multi-frequency sensors.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
