Broadband and unidirectional plasmonic hyperlensing in drift-biased graphene
Broadband and unidirectional plasmonic hyperlensing in drift-biased graphene
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DOI：
10.1063/5.0042580
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发表时间：
2021-03
影响因子：
4
通讯作者：
N. K. Paul;J. S. Gómez-Díaz
中科院分区：
文献类型：
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作者：
N. K. Paul;J. S. Gómez-Díaz
我们建议并探讨了在两个正交漂移偏置的石墨烯层上实现宽带和单向等离子体超透镜的可能性。这个平台依赖于非定域性和非互易性之间的相互作用，以产生与有效偏置电流一致的方向上的超限制态。这些状态的存在形状，拉长，并显着的iscrystal轮廓的支持模式和强制的渠道化的表面等离子体沿着所施加的偏压所定义的两个方向。通过一个专门的各向异性绿色函数形式主义，考虑到石墨烯的固有非局域性，我们表明，这个平台解决了两个点源发射器的存在，分辨率大于λ 0 / 500在一个广泛的频率范围内（10 - 25 THz）使用现实的偏置方案。我们还讨论了如何利用自旋轨道相互作用来构造具有特定偏振分布的近场图像的单向超透镜。我们的研究结果可能会打开令人兴奋的应用在动态，亚衍射，平面传感和成像系统和表面等离子体激元的激发，路由和处理。
We suggest and explore the possibility to realize broadband and unidirectional plasmonic hyperlensing over a graphene layer biased with two orthogonal drift-biases. This platform relies on the interplay between nonlocality and nonreciprocity to generate ultraconfined states in the direction aligned with the effective biasing current. The presence of these states shapes, elongates, and significantly flattens the isofrequency contour of the supported modes and enforces the canalization of surface plasmons along the two directions defined by the applied biases. Through a dedicated anisotropic Green's function formalism that takes graphene's intrinsic nonlocality into account, we show that this platform resolves the presence of two point-source emitters with a resolution larger than λ 0 / 500 over a broad frequency range ( ∼ 10 − 25 THz) using realistic biasing schemes. We also discuss how spin–orbit interactions can be exploited to construct unidirectional hyperlenses for near-field images with specific polarization distribution. Our findings may open exciting applications in dynamic, subdiffractive, and planar sensing and imaging systems and in the exciting, routing, and processing of surface plasmons.