Near‐Field Inductive Coupling Induced Polarization Control in Metasurfaces

Arbitrary manipulation of polarization of light has been an important research area that has applications in holography, vector beam generation, beam splitting, and design of wave plates. In this work, we investigate the near-field inductive coupling induced cross-polarized radiation in metasurfaces and its dominant role in polarization control. The inductive coupling in the chosen meta-molecular design depends on the mutual orientation of the meta-atoms that could tailor the coupling channel and thus the cross-polarized radiation is passively switched between “on” and “off” states leading to an effective control of the output polarization state of light. The non-intuitive tuning behavior of the inductively excited mode is interpreted through a circuit model where the exact location of the effective inductor in the meta-molecule dominates the coupling behavior. The switch on/off state of the coupling channel provides a new perspective of near-field coupling based passive and active control of polarization devices in applications such as holograms and encoded metamaterials.

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