Diamond NV Center Magnetic Field Sensor Orientation
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Solution Overview
Problem
The diamond nitrogen vacancy center (NV Center) has limited sensitivity for detecting magnetic fields depending on the orientation difference between the measurement target field and the NV Center, leading to suboptimal detection sensitivity.
Innovation Solution
A magnetic field measurement apparatus and method utilizing a diamond crystal with NV Centers arranged in multiple axes to maximize sensitivity, where the magnetic resonance member is oriented for the largest sensitivity, and a high-frequency magnetic field is applied using a microwave generator and detected using fluorescence intensity changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single NV Center orientation is used, then the device structure is simple, but the detection sensitivity varies depending on the direction of the measurement target magnetic field
Solution Approach 1:
The invention divides the NV Center ensemble into multiple orientation groups, with each group having NV Centers aligned along different crystallographic axes (<100>, <010>, <001>, <110>). This segmentation allows the system to maintain high detection sensitivity across various magnetic field directions by selecting the appropriate orientation group for the measurement conditions.
Solution Approach 2:
The invention creates a universal magnetic field detection system that can effectively measure magnetic fields regardless of their direction. By incorporating NV Centers with multiple orientation arrangements, the system achieves multi-functionality in detecting magnetic fields along different axes, eliminating the limitation of single-orientation sensors.
2Measurement precision
If NV Centers are arranged in multiple axes, then the detection sensitivity is improved for various field directions, but the manufacturing complexity increases
Solution Approach 1:
The invention utilizes the inherent crystallographic structure of diamond, which naturally possesses four <100> axes and three <111> axes. By leveraging this fixed geometric parameter of the diamond lattice, the system achieves multi-orientation NV Center arrangements without requiring complex manufacturing processes. The parameter change approach involves selecting specific crystallographic directions that are intrinsically available in the diamond structure.
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
This approach enhances the detection sensitivity of the measurement target magnetic field by aligning the NV Centers with optimal axes, resulting in improved magnetic field measurement accuracy.
Implementation Method 1
A magnetic resonance member that includes a diamond crystal including plural diamond nitrogen vacancy center... a high-frequency magnetic field generator that applies a magnetic field as a microwave to the magnetic resonance member... a detecting device that detects a physical phenomenon corresponding to a measurement target magnetic field
Implementation Method 2
ODMR (Optically Detected Magnetic Resonance) that uses electron spin resonance... a population change or the like due to magnetic resonance between the sublevels is detected as an optical signal with high sensitivity... after an electron is irradiated with a high-frequency magnetic field... and thereby the electron is initialized on the basis of photoexcitation, the electron moves from the lowest level... to an energy level higher than the lowest level... When the electron in such state is irradiated with green light, an emitting light intensity is decreased
Data Source
AI summary
A magnetic resonance member 1 includes a diamond crystal including plural diamond nitrogen vacancy center, and a high-frequency magnetic field generator 2 applies magnetic field of microwave to the magnetic resonance member 1. The aforementioned plural diamond nitrogen vacancy centers include diamond nitrogen vacancy centers arranged in directions of predetermined plural axes among four axes that indicates four connection directions of carbon atoms in the diamond crystal; and the aforementioned magnetic resonance member 1 is arranged in a direction that provides a substantially largest sensitivity of the measurement target magnetic field in the diamond nitrogen vacancy centers arranged in the predetermined plural axes.