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We developed a novel metasurface for atomic co-magnetometers, enabling miniaturized, high-sensitivity magnetic field sensing. This polarization-multiplexed device integrates beam splitting and polarization manipulation for advanced navigation and physics applications.

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Area of Science:

  • Photonics and Nanotechnology
  • Atomic Physics and Sensing
  • Optical Metrology

Background:

  • Atomic co-magnetometers are crucial for high-precision magnetic field sensing in navigation and fundamental physics.
  • Conventional optical detection modules limit miniaturization due to bulky components.
  • Existing metasurfaces often introduce noise and loss through homogeneous polarization beam splitting.

Purpose of the Study:

  • To propose and demonstrate a polarization-multiplexed metasurface for miniaturized optical detection in atomic co-magnetometers.
  • To overcome limitations of homogeneous polarization beam splitting by enabling differential detection.
  • To advance the integration of nanophotonics with atomic sensing technologies.

Main Methods:

  • Fabrication of phase-encoded amorphous silicon meta-atoms on fused silica.
  • Design of a metasurface with dual functional zones: polarization-retaining deflector (PRD) and polarization-converting deflector (PCD).
  • Implementation of a linear-to-circular polarization differential detection scheme.

Main Results:

  • The metasurface achieved over 80% transmittance at 795 nm.
  • PRD and PCD zones exhibited deflection angles with <1.5% deviation from theoretical values.
  • Demonstrated optical rotation sensitivity of 5.9184 × 10-6 rad at 70 kHz with micron-scale thickness.

Conclusions:

  • The developed polarization-multiplexed metasurface enables chip-scale atomic co-magnetometers.
  • This approach significantly enhances integration capability and reduces optical noise.
  • Establishes a novel paradigm for advanced atomic sensing technologies.