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Photoluminescence: Applications01:14

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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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    We enhanced fluorescence collection for nitrogen-vacancy centers in diamond, improving quantum sensing. This design boosts optical readout sensitivity for magnetic fields, temperature, and more.

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    Area of Science:

    • Quantum Sensing
    • Optics
    • Materials Science

    Background:

    • Nitrogen-vacancy (NV) centers in diamond are crucial for quantum sensing applications.
    • Efficient collection of emitted fluorescence is key to improving sensor sensitivity.
    • Current designs face limitations in maximizing fluorescence collection.

    Purpose of the Study:

    • To present a novel design for enhanced fluorescence collection from NV centers in diamond.
    • To improve the sensitivity of optical readout-based quantum sensing measurements.
    • To validate the design through experimental measurements and simulations.

    Main Methods:

    • Development of a new optical design for NV-diamond quantum sensors.
    • Experimental measurement of collected fluorescence from oppositely faced emitting surfaces.
    • Ray-tracing simulations to model and verify the optical design performance.

    Main Results:

    • A significant improvement in collected fluorescence was measured, by a factor of 3.8(1).
    • The experimental results closely matched the predictions from ray-tracing simulations.
    • The design effectively enhances the optical collection efficiency.

    Conclusions:

    • The presented design substantially increases fluorescence collection from NV centers.
    • This improvement directly translates to enhanced shot-noise-limited sensitivity in quantum sensing.
    • The design is applicable to sensing magnetic fields, electric fields, pressure, temperature, and rotations.