Integrated NV-Center Optics for Compact Magnetic Field Detection
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Solution Overview
Problem
Traditional devices based on ensemble nitrogen-vacancy centers occupy large spaces, restricting their use in narrow environments and increasing costs due to the need for a substantial magnetic cavity, which is difficult to miniaturize.
Innovation Solution
A compact and integrated device design incorporating a right-angle prism, dichroic parabolic condensing lens, layered diamond, Lenz lens, and microwave coil, which collectively function as a miniaturized nuclear magnetic resonance spectrometer, allowing for high-sensitivity magnetic field detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a traditional structure with objective lens, dichroic mirror, focus lens, and filter is used to collect fluorescence signals from nitrogen-vacancy centers, then the detection sensitivity is maintained, but the device occupies a large space and is difficult to miniaturize
Solution Approach 1:
The patent combines the objective lens, dichroic mirror, focus lens, and filter into a single integrated objective lens assembly. This merging of multiple optical components into one unit significantly reduces the device volume while maintaining the fluorescence collection capability and detection sensitivity required for nitrogen-vacancy center measurements
Solution Approach 2:
The integrated objective lens is designed to perform multiple functions simultaneously: collecting fluorescence signals, focusing excitation light, and filtering wavelengths. This multi-functionality eliminates the need for separate optical components, enabling device miniaturization without compromising detection performance
2Weight of stationary object
If a substantial magnetic cavity is used to generate uniformly strong magnetic field, then the magnetic field uniformity is improved, but the device weight and cost increase rapidly
Solution Approach 1:
The patent changes the magnetic field generation approach by using a micro-scale magnetic cavity with optimized geometric parameters rather than a large traditional cavity. By adjusting the cavity size, shape, and material properties, the system achieves sufficient magnetic field uniformity for nitrogen-vacancy center operation while dramatically reducing magnet weight and cost
3Area of stationary object
If the diamond is fixed on structural support with lens collection portion, then the optical alignment is stabilized, but the actual detection region occupies relatively large space
Solution Approach 1:
The patent nests the diamond sample directly within the integrated objective lens assembly, eliminating the need for separate structural supports and lens mounting mechanisms. This nested configuration stabilizes optical alignment through direct integration while minimizing the detection region area to fit within narrow environments
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 miniaturization and integration, reducing volume and weight while maintaining high sensitivity and robustness, enabling operation in confined spaces with reduced costs.
Implementation Method 1
An electronic spin of the ensemble nitrogen-vacancy centers may be adjusted by microwaves and be initialized and read out through optical means
Implementation Method 2
the ensemble nitrogen-vacancy centers in diamond to realize high sensitivity broadband vector detection of external magnetic fields
Implementation Method 3
The fluorescence then passes a dichroic mirror, a focus lens, and a filter
Implementation Method 4
a Lenz lens attached to the second face and configured to converge a microwave magnetic field
Data Source
AI summary
Provided is a device based on ensemble nitrogen-vacancy centers, including: a right-angle prism; a dichroic parabolic condensing lens, a bottom opening oblique plane of the dichroic parabolic condensing lens is fixed on an oblique plane of the right-angle prism, and the dichroic parabolic condensing lens is configured to polarize the ensemble nitrogen-vacancy centers by an incident laser and collect a fluorescence signal at the ensemble nitrogen-vacancy center; a diamond, the diamond is a layered diamond, including a first face and a second face opposite to the first face, the first face is fixed at a top of a paraboloid of the dichroic parabolic condensing lens, and the second face includes the ensemble nitrogen-vacancy centers; a Lenz lens attached to the second face and configured to converge microwave magnetic field; a microwave coil located above the Lenz lens and configured to apply microwave magnetic field to the ensemble nitrogen-vacancy centers.