2021/01/22 by Yuhan Zhong, Xiao Lin, Zhong, Yuhan +15
Engineering · Materials Science · Physics and Astronomy · #Advanced Antenna and Metasurface Technologies #FOS: Physical sciences #Metamaterials and Metasurfaces Applications #Optics (physics.optics) #Orbital Angular Momentum in Optics #physics.optics
paper · pdf · doi:10.48550/arxiv.2101.09078
arxiv created 2021/01/22 · openalex publication_date 2021/01/22 · arxiv updated 2021/01/25 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 we find 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, we reveal 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 us to actively flip their near-field coupling and non-coupling faces.