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A Scalable Method for Cavity-Enhanced Solid-State Quantum Sensors.

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  • 1School of Science, RMIT University, Melbourne, Australia.

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|December 19, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a low-cost method to embed quantum sensors like fluorescent nanodiamonds (FNDs) and hexagonal boron nitride (hBN) nanoparticles into thin-film optical cavities. This cavity enhancement boosts sensor performance and sensitivity for advanced quantum technologies.

Keywords:
emission enhancementfluorescent nanodiamondhexagonal boron nitridemicrocavityquantum sensing

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Area of Science:

  • Quantum sensing technologies
  • Nanoscale solid-state quantum emitters
  • Optoelectronics

Background:

  • Photoluminescent color centers in diamond and hexagonal boron nitride (hBN) are crucial for quantum technologies.
  • Integrating these nanoscale sensors into macroscopic structures is vital for enhancing sensitivity and enabling large-scale deployment.

Purpose of the Study:

  • To demonstrate cavity-enhanced photoluminescence (PL) of fluorescent nanodiamonds (FNDs) and hBN nanoparticles (NPs) within polymer-based thin-film optical cavities.
  • To investigate the impact of these cavities on sensor performance, including spectral modulation, decay rates, and magnetic field sensitivity.

Main Methods:

  • Embedding FNDs and hBN NPs into centimeter-scale, polymer-based thin-film optical cavities.
  • Utilizing cavity resonances to modulate the spectral PL peak position of nitrogen-vacancy (NV) centers in FNDs.
  • Measuring the Purcell enhancement of PL decay rates for both NV centers and hBN NPs.

Main Results:

  • Cavity resonances modulated the spectral PL peak position of NV centers and achieved up to 2.9-fold Purcell enhancement of the NV PL decay rate.
  • hBN NP brightness increased up to threefold, with PL decay rates enhanced up to 13-fold within the cavities.
  • A 4.8-fold improvement in magnetic field sensitivity was observed for FNDs in thin-film cavities.

Conclusions:

  • Demonstrates a scalable and low-cost method for fabricating quantum sensor-doped thin-film cavities.
  • Cavity enhancement significantly improves the performance of diamond and hBN-based quantum sensors.
  • This work is a key step towards developing advanced quantum sensing technologies.