All-passive nonreciprocal metastructure.
All-passive nonreciprocal metastructure.
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DOI：
10.1038/ncomms9359
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发表时间：
2015-09-28
影响因子：
16.6
通讯作者：
Engheta N
中科院分区：
文献类型：
--
作者：
Mahmoud AM;Davoyan AR;Engheta N
光的单向传播，类似于电子在存在电势差的情况下的定向流动，一直是波与物质相互作用的一个重要目标。打破光子流中的时间反转对称性面临着与电子流不同的挑战。近年来，已经提出了多种途径和方法来实现这一目标。在这里，我们研究了另一种系统方法来设计全无源相对高吞吐量的元结构，该元结构表现出不可逆特性并实现波流隔离。此外，我们在这些发现的基础上提出了一种准二维元结构的范例，该范例在不使用任何磁或电偏置的情况下模拟法拉第旋转的非互易性质。我们设想所提出的方法可以作为全无源时间反转对称性破坏的构建块，并具有未来不可逆系统和设备的潜在应用。全无源不可逆元结构的设计是一项具有挑战性的任务，因为在不可逆传输比和插入损耗之间需要权衡。在这里，马哈茂德等人。提出了一种全无源、高通量元结构的概念，该元结构表现出不可逆特性和波流隔离。
One-way propagation of light, analogous to the directional flow of electrons in the presence of electric potential difference, has been an important goal in the wave–matter interaction. Breaking time-reversal symmetry in photonic flows is faced with challenges different from those for electron flows. In recent years several approaches and methods have been offered towards achieving this goal. Here we investigate another systematic approach to design all-passive relatively high-throughput metastructures that exhibit nonreciprocal properties and achieve wave-flow isolation. Moreover, we build on those findings and propose a paradigm for a quasi-two-dimensional metastructure that mimics the nonreciprocal property of Faraday rotation without using any magnetic or electric biasing. We envision that the proposed approaches may serve as a building block for all-passive time-reversal symmetry breaking with potential applications for future nonreciprocal systems and devices The design of all-passive nonreciprocal metastructures is a challenging task as there are trade-offs between the nonreciprocal transmission ratio and insertion loss. Here, Mahmoud et al. propose a concept for all-passive, high-throughput metastructures that exhibit nonreciprocal properties and wave-flow isolation.