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Updated: Feb 10, 2026

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Reflectionless Linear Polarization Rotators with Angular Robustness.

Hadi Ahmadi1, Sanchita Sarker1, Mohammad Parvinnezhad Hokmabadi1

  • 1Electrical and Computer Engineering Department, University of North Carolina at Charlotte, Charlotte, North Carolina 28223, United States.

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Summary

Researchers developed a compact terahertz metasurface for polarization optics. This novel chiral bilayer design achieves near-zero reflection and precise polarization rotation, enabling scalable fabrication for advanced optical systems.

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Area of Science:

  • Optics and Photonics
  • Metamaterials
  • Nanotechnology

Background:

  • Integrated polarization optics requires compact, alignment-free rotators with low reflection and constant thickness for scalable fabrication.
  • Existing solutions like natural optical rotators or complex metasurfaces have limitations in size, alignment, or fabrication compatibility.

Purpose of the Study:

  • To numerically design a novel terahertz chiral bilayer metasurface.
  • To achieve prescribed linear-polarization rotations with near-zero reflection over a wide range of incident angles.
  • To ensure the design is compatible with wafer-level fabrication.

Main Methods:

  • Numerical design of a terahertz chiral bilayer metasurface utilizing 4-fold rotational (C4) symmetry.
  • Exploiting C4 symmetry to eliminate cross-polarized reflection.
  • Implementing destructive interference to minimize copolarized reflectivity at a target resonance.

Main Results:

  • The designed metasurface achieves prescribed linear-polarization rotations with near-zero reflection.
  • Reflectionless response is maintained across diverse rotation angles at a constant device thickness.
  • The structure exhibits strong angular robustness, remaining reflectionless for incidence angles up to ~20°.

Conclusions:

  • The developed terahertz metasurface offers a compact, alignment-free solution for polarization rotation with low reflection.
  • This design overcomes limitations of natural optical rotators and existing metasurfaces, enabling scalable wafer-level fabrication.
  • Potential applications include secure optical communications, parallel photonic processing, and advanced imaging.