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Longitudinal field controls vector vortex beams in anisotropic epsilon-near-zero metamaterials

Author

Listed:
  • Vittorio Aita

    (King’s College London)

  • Diane J. Roth

    (King’s College London)

  • Anastasiia Zaleska

    (King’s College London)

  • Alexey V. Krasavin

    (King’s College London)

  • Luke H. Nicholls

    (King’s College London)

  • Mykyta Shevchenko

    (King’s College London
    National Physical Laboratory (NPL))

  • Francisco J. Rodríguez-Fortuño

    (King’s College London)

  • Anatoly V. Zayats

    (King’s College London)

Abstract

Structured light plays an important role in metrology, optical trapping and manipulation, communications, quantum technologies and nonlinear optics. Here, we demonstrate an alternative approach for the manipulation of vector beams carrying longitudinal field components using metamaterials with extreme anisotropy. Implementing vectorial spectroscopy, we show that the propagation of complex beams with inhomogeneous polarization is strongly affected by the interplay of the metamaterial anisotropy with the transverse and longitudinal field structure of the beam. This phenomenon is especially pronounced in the epsilon-near-zero regime, exclusively realised for light polarized along the metamaterial optical axis, strongly influencing the interaction of longitudinal fields with the metamaterial. The requirements on the balance between the transverse and longitudinal fields to maintain a polarization singularity at the beam axis allow control of the beam modal content, filtering diffraction effects and tailoring spatial polarization distributions. The understanding of the interaction of vector beams with metamaterials opens new opportunities for applications in microscopy, information encoding, biochemical sensing and quantum technologies.

Suggested Citation

  • Vittorio Aita & Diane J. Roth & Anastasiia Zaleska & Alexey V. Krasavin & Luke H. Nicholls & Mykyta Shevchenko & Francisco J. Rodríguez-Fortuño & Anatoly V. Zayats, 2025. "Longitudinal field controls vector vortex beams in anisotropic epsilon-near-zero metamaterials," Nature Communications, Nature, vol. 16(1), pages 1-11, December.
  • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-58088-8
    DOI: 10.1038/s41467-025-58088-8
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    References listed on IDEAS

    as
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