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The recently discovered spin defects in hexagonal boron nitride (hBN), alayered van der Waals material, have great potential in quantum sensing.However, the photoluminescence and the contrast of the optically detectedmagnetic resonance (ODMR) of hBN spin defects are relatively low so far, whichlimits their sensitivity. Here we report a record-high ODMR contrast of 46$\%$at room temperature, and simultaneous enhancement of the photoluminescence ofhBN spin defects by up to 17-fold by the surface plasmon of a gold-filmmicrowave waveguide. Our results are obtained with shallow boron vacancy spindefects in hBN nanosheets created by low-energy He$^+$ ion implantation, and agold-film microwave waveguide fabricated by photolithography. We also explorethe effects of microwave and laser powers on the ODMR, and improve thesensitivity of hBN spin defects for magnetic field detection. Our resultssupport the promising potential of hBN spin defects for nanoscale quantumsensing.

High-contrast plasmonic-enhanced shallow spin defects in hexagonal boron nitride for quantum sensing