Frontiers in Physics (Feb 2022)

Broadband Achromatic and Polarization Insensitive Focused Optical Vortex Generator Based on Metasurface Consisting of Anisotropic Nanostructures

  • Naitao Song,
  • Naitao Song,
  • Nianxi Xu,
  • Jinsong Gao,
  • Jinsong Gao,
  • Xiaonan Jiang,
  • Dongzhi Shan,
  • Dongzhi Shan,
  • Yang Tang,
  • Qiao Sun,
  • Hai Liu,
  • Xin Chen

DOI
https://doi.org/10.3389/fphy.2022.846718
Journal volume & issue
Vol. 10

Abstract

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Optical vortex (OV) beams are ideal carriers for high-capacity optical communication, and long-wave infrared (LWIR) is the ideal wavelength band for long-range optical communication. Here, we propose a method for the achromatic generation of focused optical vortex (FOV) beams with arbitrary homogenous polarization states in the LWIR using a single all-germanium metasurface. The chromatic aberration and polarization sensitivity are eliminated by superimposing a polarization-insensitive geometric phase and a dispersion-engineered dynamic phase. The method is validated using two broadband FOV generators with the same diameter and focal length but different topological charges. The results indicate that the FOV generators are broadband achromatic and polarization insensitive. The proposed method may pave the way for chip-scale optical communication devices.

Keywords