Toggling Near-Field Directionality via Polarization Control of Surface Waves

Yuhan Zhong, Xiao Lin, Jing Jiang, Yi Yang, Gui Geng Liu, Haoran Xue, Tony Low, Hongsheng Chen, Baile Zhang

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish (US)
JournalLaser and Photonics Reviews
DOIs
StateAccepted/In press - 2021

Bibliographical note

Funding Information:
Y.Z. and X.L. contributed equally to this work. The work was sponsored by NSF/EFRI‐1741660; the National Natural Science Foundation of China (NNSFC) under grants numbers 61625502, 11961141010, and 61975176; the Top‐Notch Young Talents Program of China; the Fundamental Research Funds for the Central Universities; and the Singapore Ministry of Education (grant nos. MOE2018‐T2‐1‐022 (S) and MOE2016‐T3‐1‐006).

Publisher Copyright:
© 2021 Wiley-VCH GmbH

Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.

Keywords

  • graphene
  • metasurface
  • plasmonics
  • spin–orbit interaction of light

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