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Toggling Near‐Field Directionality via Polarization Control of Surface Waves
Laser & Photonics Reviews ( IF 11.0 ) Pub Date : 2021-02-24 , DOI: 10.1002/lpor.202000388
Yuhan Zhong 1, 2 , Xiao Lin 1, 2 , Jing Jiang 3 , Yi Yang 4 , Gui‐Geng Liu 5 , Haoran Xue 5 , Tony Low 6 , Hongsheng Chen 1, 2 , Baile Zhang 5, 7
Affiliation  

Directional excitation of guidance modes is central to many applications ranging from light harvesting, optical information processing to quantum optical technology. Of paramount interest, especially, the active control of near‐field directionality provides a new paradigm for the real‐time on‐chip manipulation of light. Here, it is found that for a given dipolar source, its near‐field directionality can be toggled efficiently via tailoring the polarization of surface waves that are excited, for example, via tuning the chemical potential of graphene in a graphene‐metasurface waveguide. This finding enables a feasible scheme for the active near‐field directionality. Counterintuitively, it is revealed that this scheme can transform a circular electric/magnetic dipole into a Huygens dipole in the near‐field coupling. Moreover, for Janus dipoles, this scheme enables actively flipping their near‐field coupling and non‐coupling faces.

中文翻译:

通过表面波的极化控制切换近场方向性

引导模式的定向激励对于从光收集,光学信息处理到量子光学技术的许多应用都是至关重要的。特别重要的是,近场方向性的主动控制为光的实时芯片操纵提供了新的范例。在这里,我们发现,对于给定的偶极子源,可以通过调整被激发的表面波的极化来有效地切换其近场方向性,例如,通过调节石墨烯-亚表面波导中石墨烯的化学势。这一发现为主动近场定向性提供了可行的方案。与直觉相反,发现该方案可以在近场耦合中将圆形的电磁偶极子转换成惠更斯偶极子。此外,对于Janus偶极子,
更新日期:2021-04-11
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