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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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Magnetic-field-assisted optical fiber quantum temperature sensor with enhanced sensitivity
Optics Letters
|March 15, 2024
Summary
Researchers enhanced diamond nitrogen-vacancy (NV) center temperature sensing by using magnetic fields to regulate energy levels. This fiber-optic integrated sensor achieved a 4.2-fold improvement in temperature responsivity and a 2.1-fold enhancement in sensitivity.
Area of Science:
- Quantum sensing
- Materials science
- Optics
Background:
- Nitrogen-vacancy (NV) centers in diamond are promising for temperature sensing.
- Current limitations in sensitivity are due to intrinsic temperature responsivity (-74 kHz/K).
Purpose of the Study:
- To enhance temperature sensitivity of diamond NV center sensors.
- To overcome the limitations of intrinsic temperature responsivity.
Main Methods:
- Integrated a micron-sized diamond with an optical fiber.
- Utilized a magnet positioned near the diamond, with distance controlled by temperature.
- Leveraged magnetic field regulation of NV energy levels to enhance temperature sensitivity.
Main Results:
- Achieved a 4.2-fold improvement in temperature responsivity.
- Demonstrated a 2.1-fold enhancement in overall temperature sensitivity.
- Developed a portable fiber-optic integrated diamond sensor.
Conclusions:
- Magnetic field regulation effectively enhances diamond NV center-based temperature sensing.
- The proposed fiber-optic integrated sensor offers improved sensitivity and portability.
