Diamond NV Center Sensor Array for Room-Temperature Magnetic Sensing
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Solution Overview
Problem
Current technologies lack a solution for achieving high-sensitivity two-dimensional magnetic field measurements at room temperature, particularly in terms of the type of diamond to use and the structure of the sensor array for effective magnetic sensing.
Innovation Solution
A diamond crystal with an NV region containing nitrogen-vacancy centers, where the NV region has a donor concentration equal to or higher than the NV center concentration, and is formed on a {111} face or with an off-angle of ±10 degrees, is used in a diamond device with a periodic array and electrodes for enhanced magnetic sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional diamond structures are used for magnetic sensing, then the device can operate at room temperature, but the sensitivity and measurement precision are insufficient
Solution Approach 1:
The patent introduces a dual-region diamond structure where the first region contains NV centers for magnetic sensing and the second region has higher donor concentration for electron supply. This local differentiation of properties allows the NV centers to maintain stable negative charge states while preserving magnetic sensitivity, resolving the contradiction between measurement precision and reliability.
Solution Approach 2:
The patent changes the donor concentration parameter in the second region to be higher than in the first region, creating a gradient that facilitates electron diffusion to the NV centers. This parameter modification ensures stable NV- charge states without compromising the magnetic sensing capability, thereby improving both reliability and measurement precision.
2Measurement precision
If NV centers are introduced for high sensitivity magnetic detection, then measurement precision improves, but the complexity of maintaining NV- charge state increases
Solution Approach 1:
The patent creates a structured sensor array with periodically arranged first regions (containing NV centers) and second regions (providing electrons) in a diamond lattice. This local quality differentiation simplifies the overall device structure by integrating charge state maintenance directly into the crystal lattice, rather than requiring external complex control systems.
Solution Approach 2:
The second region with higher donor concentration automatically supplies electrons to the NV centers through diffusion, creating a self-maintaining NV- charge state. This self-service mechanism eliminates the need for external electron injection systems, reducing device complexity while maintaining high measurement precision.
3Reliability
If donor concentration is increased to maintain NV- charge state, then reliability improves, but the NV center concentration and magnetic sensitivity may be reduced
Solution Approach 1:
The patent spatially separates the functions of magnetic sensing and electron supply into different regions. The first region maintains low donor concentration to preserve high NV center concentration and magnetic sensitivity, while the second region has high donor concentration to ensure reliable electron supply and NV- charge state stability. This local quality differentiation resolves the contradiction between reliability and measurement precision.
Solution Approach 2:
The diamond crystal is segmented into functionally distinct first and second regions with different donor concentrations. This segmentation allows independent optimization of each region: the first region for maximum magnetic sensitivity and the second region for charge state stability, thereby resolving the contradiction between the two requirements.
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 configuration allows for almost 100% of the NV centers to remain negatively charged, aligning their spin states for sharp optically detected magnetic resonance signals, enabling high-sensitivity two-dimensional magnetic measurements at room temperature.
Implementation Method 1
When the NV− center in the ground state is irradiated with green light, the NV− center emits red fluoresce.
Implementation Method 2
when a sensor using the NV− center is irradiated with a microwave having a frequency of approximately 2.8 GHz, and the frequency of the microwave is swept, the sensor can detect the magnetic field strength as a brightness lowering point of the red fluorescence
Data Source
AI summary
A diamond crystal according to the present invention has an NV region containing a complex (NV center) of nitrogen substituted with a carbon atom and a vacancy located adjacent to the nitrogen, on a surface or in the vicinity of the surface, wherein the NV region has a donor concentration equal to or higher than the concentration of the NV centers, or a crystal of the NV region is a {111} face or a face having an off-angle that is ±10 degrees or less against the {111} face, and a principal axis of the NV center is a <111> axis that is perpendicular to the {111} face. Such a diamond crystal enables almost 100% of the NV center to be a state (NV−) of having a negative electric charge, and spin states of the NV− centers to be aligned in one direction.