Drift-Induced Unidirectional Graphene Plasmons
Drift-Induced Unidirectional Graphene Plasmons
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DOI：
10.1021/acsphotonics.8b00987
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发表时间：
2017-11
期刊：
影响因子：
7
通讯作者：
Tiago A. Morgado;M. Silveirinha
中科院分区：
文献类型：
--
作者：
Tiago A. Morgado;M. Silveirinha
非互易光子器件实现了光的“单向”流动，是光学系统的重要组成部分。在这里，我们提出了一种新的范例，以打破互易，实现单向亚波长光传输完全兼容现代全光子高度集成系统。理论上证明了具有恒定漂移电流的石墨烯薄膜具有很强的非互易可调谐响应，特别是支持不受缺陷和障碍物后向散射的单向表面等离子体激元。值得注意的是，漂移电流偏置可以使石墨烯等离子体的传播长度提高100%以上。我们的发现开启了非互易光子学的新领域，并为利用单原子厚度的非互易器件控制光的流动提供了新的机会。
Nonreciprocal photonic devices enable "one-way" light flows and are essential building blocks of optical systems. Here, we suggest a novel paradigm to break reciprocity and achieve unidirectional subwavelength light propagation fully compatible with modern all-photonic highly-integrated systems. It is theoretically demonstrated that a graphene sheet biased with a constant drift electric current has a strong nonreciprocal tunable response and, in particular, supports one-way surface plasmon polaritons immune to backscattering from defects and obstacles. Remarkably, it is found that the drift-current biasing may boost the propagation length of the graphene plasmons by more than 100%. Our findings open new inroads in nonreciprocal photonics and offer a new opportunity to control the flow of light with one-atom thick nonreciprocal devices.