Robust 1-μm-Resolution Magnetic Probe Enabled by Optical Trapping of Nanodiamonds on a Tapered Fiber.
basic_science · Level V
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- Record sourced from PubMed, PMID 40526886.
- Also identified by DOI 10.1021/acs.nanolett.5c02307.
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Abstract
High-resolution magnetic field scanning is critical for investigating nanoscale spin systems and characterizing defects in microelectronic devices. We present a fabrication-free approach to create robust magnetic probes with 1-μm spatial resolution by synergizing the quantum magnetic sensitivity of nitrogen-vacancy (NV) centers in nanodiamonds with the enhanced photon efficiency of tapered fibers. Through gradient-force optical trapping, nanodiamonds are precisely positioned at the fiber tip, where van der Waals forces immobilize them without requiring micro-nanoprocessing. In addition to possessing high spatial resolution, the probe exhibits a magnetic sensitivity reaching <math xmlns="http://www.w3.org/1998/Math/MathML"><mn>80</mn><mo></mo><mi>μ</mi><mi>T</mi><mo>/</mo><msqrt><mrow><mi>Hz</mi></mrow></msqrt></math>. By demonstrating a magnetic field scan of crossed microwires, this method can be extended to measure tiny magnetic structures or microcircuits, leveraging the integrated photonic enhancement of tapered fibers for robust high signal-to-noise sensing.