Diamond NV Center Magnetic Sensing With Isolated Readout Elements
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Solution Overview
Problem
Existing magnetic field sensing devices using Hall sensors and transistor switches made of semiconductive material suffer from interference and inaccuracies due to non-uniform electrical fields, leading to compromised measurement results.
Innovation Solution
A magnetic field sensing device utilizing a diamond NV center substrate with isolated magnetic sensing elements, controlled by a biasing element and illuminated by light and irradiated with microwaves to generate photocurrent, allowing for accurate measurement of magnetic fields through photocurrent analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Hall sensors and transistor switches made of semiconductive material are used to measure magnetic field distributions, then measurement capability is achieved, but measurement accuracy deteriorates due to non-uniform electrical fields causing interference between adjacent sensing elements
Solution Approach 1:
The device segments the sensing elements by providing electrical isolation between adjacent Hall sensors using individual field effect transistor switches. Each sensing element is electrically isolated from its neighbors, preventing the non-uniform electrical fields generated by one element from interfering with adjacent elements. This segmentation approach maintains measurement capability while eliminating the harmful interference that previously degraded accuracy.
2Ease of manufacture
If symmetrical electrode arrangement is used in integrated optical waveguide and electronic design, then manufacturing simplicity is improved, but measurement accuracy deteriorates due to non-uniform electrical fields at the ends
Solution Approach 1:
The device employs asymmetrical electrode arrangements where field effect transistor switches are positioned to provide electrical isolation between adjacent Hall sensors. This asymmetrical configuration creates uniform electrical fields across the sensing elements, eliminating the non-uniform fields at the ends that occur with symmetrical arrangements. The asymmetrical design maintains ease of manufacture through integrated construction while significantly improving measurement accuracy by preventing electrical field interference.
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 device achieves higher spatial resolution and improved measurement sensitivity, enabling faster and more accurate magnetic field detection with reduced interference from neighboring elements.
Implementation Method 1
Each second contact is electrically isolated from each first contact. The controller is configured to control a biasing element to apply a bias voltage to the first contacts of a selection of the plurality of sensing elements, thereby generating a local external electrical field in each of the selected sensing elements, while the selected sensing elements are illuminated by at least one light source, thereby inducing a photocurrent in each of the selected sensing elements
Implementation Method 2
irradiated by at least one microwave source, thereby influencing the photocurrent generated in each of the selected sensing elements
Data Source
AI summary
Magnetic field sensing device A magnetic field sensing device and a method are described for measuring magnetic field distributions, comprising a predetermined area of a diamond NV center substrate and a controller. The predetermined area has a plurality of magnetic sensing elements which can be selectively activated and read-out. To enable a magnetic sensing element to sense a magnetic field simultaneously a local electrical field is generated, the sensing element is exposed to light of a predetermined wavelength or wavelength range, the magnetic element is irradiated with microwaves of a predetermined frequency or frequency range, and the photocurrent generated is collected and measured allowing to extract sensed magnetic field values therefrom.