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Compact multipass-laser-beam antenna for NV sensor sensitivity enhancement.

Yulei Chen, Tongtong Li, Dawei Wang

    Optics Express
    |October 20, 2023
    PubMed
    Summary

    A novel compact antenna enhances nitrogen-vacancy (NV) magnetometer sensitivity by increasing laser excitation path length. This design boosts magnetic field sensitivity to 2.8 nT/√Hz, enabling high-performance sensing.

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    Area of Science:

    • Quantum sensing
    • Optics and photonics
    • Materials science

    Background:

    • High sensitivity magnetometers are crucial for various scientific and technological applications.
    • Nitrogen-vacancy (NV) centers in diamond are promising quantum sensors due to their spin properties.
    • Efficient optical excitation and uniform microwave fields are essential for optimizing NV magnetometer performance.

    Purpose of the Study:

    • To develop a compact antenna for enhanced excitation of NV ensemble color centers.
    • To improve the sensitivity and performance of NV magnetometers.
    • To provide a method for designing integrated NV magnetometers.

    Main Methods:

    • Design and simulation of a compact multipass-laser-beam antenna using COMSOL multi-physics software.

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  • Optimization of antenna size and laser incidence angle.
  • Experimental validation of the antenna's performance in an NV magnetometer setup.

    • Main Results:

    • The designed antenna provides a tridimensional uniform magnetic field and efficient fluorescence excitation.
    • The multipass structure increased the excitation beam path length by three orders of magnitude compared to direct beam mode.
    • Achieved a magnetic field sensitivity of 2.8 nT/√Hz in the 10-100 Hz range, a 60-fold improvement.

    Conclusions:

    • The compact multipass-laser-beam antenna significantly enhances NV magnetometer sensitivity.
    • This approach offers a viable method for designing integrated and high-performance NV magnetometers.
    • The study demonstrates a pathway to improved quantum sensing capabilities using optimized optical and microwave field delivery.