Integrated Diamond ODMR Sensor With Homogeneous Internal Bias Field
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Solution Overview
Problem
Existing magnetic field measurement devices using optical magnetic resonance (ODMR) are large in size and costly due to separate laser emitters and require external coils for bias magnetic fields, limiting their applications and increasing manufacturing costs.
Innovation Solution
A compact sensor device integrating a diamond with color centers, a laser emitter, and photodetectors within a circuit board, where current-carrying structures generate a homogeneous bias magnetic field internally, eliminating the need for external coils and using laser diodes and photodiodes for fluorescence excitation and detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate laser emitters and external coils are used for ODMR magnetic field measurement, then the device can achieve magnetic field measurement functionality, but the device size becomes large and manufacturing costs increase
Solution Approach 1:
The patent integrates the laser emitter, photodetector, and bias magnetic field generation into a single circuit board assembly with the diamond sensor. The current-carrying structures on the circuit board generate the bias magnetic field internally, eliminating the need for separate external coils. This merging of components achieves compact device size while maintaining ODMR measurement functionality through fluorescence excitation and detection of nitrogen defect centers in the diamond.
2Measurement precision
If separate laser emitters and external coils are used for ODMR magnetic field measurement, then the device can achieve magnetic field measurement functionality, but manufacturing costs increase
Solution Approach 1:
The patent integrates the laser emitter, photodetector, and bias magnetic field generation into a single circuit board assembly with the diamond sensor. The current-carrying structures on the circuit board generate the bias magnetic field internally, eliminating the need for separate external coils. This merging of components achieves compact device size while maintaining ODMR measurement functionality through fluorescence excitation and detection of nitrogen defect centers in the diamond.
3Volume of moving object
If current-carrying structures are integrated into the circuit board to generate bias magnetic field, then device size is reduced, but the magnetic field homogeneity within the diamond volume must be precisely controlled
Solution Approach 1:
The patent employs current-carrying structures on the circuit board that are specifically designed to generate a homogeneous bias magnetic field within the diamond volume. The structures are positioned and configured to ensure the magnetic field deviates by no more than 1% from the target value (100 μT to 10 mT) throughout the sensitive diamond volume, achieving local field uniformity despite the integrated compact design.
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
The integrated design reduces device size and manufacturing costs while maintaining sensitivity, enabling high-sensitivity magnetic field measurements with reduced space requirements.
Implementation Method 1
the laser emitter is designed for fluorescence excitation of the color centers in the diamond
Implementation Method 2
sensor device for magnetic field measurement by means of optical magnetic resonance measurement
Implementation Method 3
at least one of the layers has current-carrying structures which are designed to produce a homogeneous magnetic field which is oriented perpendicularly to the layers of the circuit board and which permeates the diamond
Implementation Method 4
Due to the Zeeman effect, the layer is linearly dependent on the magnetic field at the location of the nitrogen defect center
Data Source
AI summary
A sensor device for magnetic field measurement using optical magnetic resonance measurement (ODMR) includes a sensor device for magnetic field measurement using ODMR, including a diamond having a plurality of nitrogen defects, a laser emitter, a photodetector, and a circuit board. The laser emitter is designed for the fluorescence excitation of the nitrogen defects, and the photodetector is designed to receive fluorescence radiation of the nitrogen defects. The circuit board has a plurality of layers comprising at least one inner layer; the laser emitter is disposed on an upper face of the circuit board; the photodetector is disposed on a lower face of the circuit board; the diamond is disposed in the interior of the circuit board in the plane of extension of the at least one inner layer; and at least one of the layers has current-carrying structures designed to produce a homogeneous magnetic field which is oriented perpendicularly to the layers of the circuit board and which permeates the diamond.