Unidirectional surface plasmons in nonreciprocal graphene
Unidirectional surface plasmons in nonreciprocal graphene
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DOI：
10.1088/1367-2630/15/11/113003
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发表时间：
2013-11
影响因子：
3.3
通讯作者：
Xiao Lin;Yang Xu;Baile Zhang;R. Hao;Hongsheng Chen;Erping Li
中科院分区：
文献类型：
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作者：
Xiao Lin;Yang Xu;Baile Zhang;R. Hao;Hongsheng Chen;Erping Li
我们从理论上证明了单向表面等离子体激元的存在，在非互易石墨烯基的回旋接口。我们表明，一个单向的频率范围内提出了一个静态的外部磁场下，只有一个传播方向是允许的表面等离子体模式。通过有效控制石墨烯的化学势，单向工作频率可以从太赫兹到近红外甚至可见光连续可调。特别地，在相同的磁场下，单向频率带宽可以比金属大1- 2个数量级，这源于石墨烯中极小的有效电子质量的优势。在理论分析的基础上，提出了两种基于石墨烯的可调谐定向器件，展示了非互易石墨烯在非互易光学器件设计中的吸引人的特性。
We demonstrate theoretically the existence of unidirectional surface plasmons in the nonreciprocal graphene-based gyrotropic interfaces. We show that a unidirectional frequency range is raised under a static external magnetic field where only one propagating direction is allowed for the surface plasmons mode. By efficiently controlling the chemical potential of graphene, the unidirectional working frequency can be continuously tunable from THz to near-infrared and even visible. Particularly, the unidirectional frequency bandwidth can be 1– 2 orders of magnitude larger than that in metal under the same magnetic field, which arises from the superiority of extremely small effective electron mass in graphene. Based on our theoretical analysis, two tunable graphene-based directional devices are proposed, showing the appealing properties of nonreciprocal graphene in the nonreciprocal optical devices design.