Journal
LASER & PHOTONICS REVIEWS
Volume 15, Issue 4, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/lpor.202000388
Keywords
graphene; metasurface; plasmonics; spin– orbit interaction of light
Categories
Funding
- National Natural Science Foundation of China (NNSFC) [61625502, 11961141010, 61975176]
- Top-Notch Young Talents Program of China
- Fundamental Research Funds for the Central Universities
- Singapore Ministry of Education [MOE2018-T2-1-022 (S), MOE2016-T3-1-006]
- [NSF/EFRI-1741660]
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The research found that the near-field directionality of a dipolar source can be efficiently toggled by tailoring the polarization of surface waves, providing a feasible scheme for active control. Interestingly, this scheme can transform a circular electric/magnetic dipole into a Huygens dipole in the near-field coupling, and also enable actively flipping the near-field coupling and non-coupling faces of Janus dipoles.
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.
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