Optical NV Center Magnetometry Without Microwave Excitation
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Solution Overview
Problem
Existing sensor systems utilizing NV centers require microwave frequencies, which can be cumbersome and may limit their applicability and efficiency.
Innovation Solution
A sensor system utilizing a plurality of NV centers, particularly in nanodiamonds with different crystal orientations, operates without the need for microwave frequencies, leveraging optical properties at room temperature to measure magnetic flux density and other parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If microwave frequency is used in NV center sensor systems, then magnetic flux density can be measured, but the system becomes cumbersome and less versatile
Solution Approach 1:
The patent replaces the microwave-based magnetic resonance technique with an optical measurement approach. Instead of using microwave frequencies to excite NV centers, the system uses optical excitation and measures the resulting photoluminescence characteristics to determine magnetic flux density, thereby eliminating the need for complex microwave generation and detection equipment.
Solution Approach 2:
The patent changes the operating parameters from microwave frequency domain to optical frequency domain. By measuring the shift in photoluminescence wavelength or intensity changes of NV centers under optical excitation instead of microwave excitation, the system achieves magnetic field measurement without requiring microwave frequencies, thus simplifying the device architecture.
2Adaptability or versatility
If a single NV center is used, then the system is simple, but measurement versatility and reliability are limited
Solution Approach 1:
The patent combines multiple NV centers into a single sensor element, where the collective signal from multiple NV centers provides both enhanced measurement reliability and versatility. The combined signal allows for more robust detection and enables the system to handle various measurement scenarios, including noisy environments and different magnetic field strengths.
Solution Approach 2:
The patent designs the sensor element with multiple NV centers to achieve multi-functionality, enabling the same device to perform various measurement tasks across different applications. The array of NV centers provides universal capability for measuring magnetic flux density under diverse conditions, from weak to strong fields, and in various environmental settings.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient and versatile measurement of magnetic flux density and other parameters without the limitations of microwave-based systems, enhancing operational flexibility and performance.
Implementation Method 1
A sensor system utilizing a plurality of NV centers, particularly in nanodiamonds with different crystal orientations, operates without the need for microwave frequencies, leveraging optical properties at room temperature to measure magnetic flux density and other parameters
Data Source
AI summary
A sensor system includes a quantum dot including one or more paramagnetic centers. It comprises a control and evaluation device including a pump radiation source, a radiation receiver and which irradiates the quantum dot depending on a transmission signal. The quantum dot emits fluorescence radiation upon irradiation with the pump radiation, which depends on the magnetic flux density and/or on another physical parameter. The control and evaluation device generates an output signal including a measured value as a function of the fluorescence radiation. The control and evaluation device compensatingly readjusts the sensitivity of the quantum dot for the magnetic flux density and/or the other physical parameter by means of one or more compensation coils.