NV-Diamond Super-Resolution B-Field Imaging via Acoustic Modulation
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Solution Overview
Problem
Existing magnetic-field imaging techniques using NV-diamond chips are limited by the optical diffraction limit, resulting in resolutions worse than 1 μm, and methods to achieve super-resolution are either slow or complex.
Innovation Solution
The proposed solution involves modulating the sensitivity of NV-centers in diamond chips using acoustic standing waves, magnetic fields, or electric fields to achieve spatial magnetic field information with resolutions better than 1 μm, leveraging advanced microfabrication techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If optical diffraction limit is accepted for simplicity, then imaging speed and setup convenience are improved, but imaging resolution deteriorates to ≥1 μm
Solution Approach 1:
The patent segments the NV-diamond chip into multiple regions with different stress states using acoustic standing waves. By dividing the chip into zones with alternating compressive and tensile stress, the system creates spatially varying sensitivity patterns that enable super-resolution imaging without mechanical scanning, thus maintaining fast imaging speed while achieving sub-diffraction resolution.
Solution Approach 2:
The patent introduces a new dimension of control by applying acoustic standing waves along orthogonal directions (x and y axes) to the NV-diamond chip. This creates a two-dimensional grid of sensitivity modulation that allows simultaneous encoding of spatial information from multiple NV-centers, achieving super-resolution in both dimensions without sequential scanning.
2Measurement precision
If mechanical scanning of nano-NV-diamond probe is used to achieve super-resolution, then imaging resolution is improved, but imaging time increases significantly
Solution Approach 1:
The patent replaces the mechanical scanning system with an acoustic field-based modulation system. Instead of physically moving the NV-diamond chip or probe, acoustic standing waves are used to modulate the sensitivity of NV-centers in fixed positions. This substitution eliminates mechanical inertia and scanning time while achieving comparable or better spatial resolution through field-based encoding.
Solution Approach 2:
The patent employs periodic acoustic standing waves that oscillate at specific frequencies to modulate NV-center sensitivity. By applying periodic stress patterns along orthogonal directions, the system encodes spatial information from multiple NV-centers simultaneously in the frequency domain, allowing parallel acquisition of spatial data without sequential scanning.
3Measurement precision
If acoustic standing waves are applied to modulate NV-center sensitivity, then super-resolution imaging is achieved, but device complexity increases
Solution Approach 1:
The patent makes the NV-diamond chip multi-functional by enabling it to serve as both the substrate and the sensing element. The chip's acoustic modes are excited to create standing waves that modulate NV-center sensitivity, while the same NV-centers detect magnetic fields. This universality eliminates the need for separate actuation and sensing components, reducing overall system complexity despite the sophisticated physics involved.
Solution Approach 2:
The NV-diamond chip performs self-modulation of NV-center sensitivity through its own acoustic resonances. The chip structure itself supports standing wave modes that automatically create the required stress patterns when excited, without requiring external mechanical actuators or complex control mechanisms. The system uses the chip's inherent acoustic properties to achieve the modulation needed for super-resolution imaging.
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 enables fast and efficient magnetic-field imaging with super-resolution, improving photon collection efficiency and signal-to-noise ratio, potentially achieving resolutions as high as 50 nm.
Implementation Method 1
a diamond chip including a plurality of color centers (the plurality of color centers fluorescing in response to the pumping light beam and a magnetic field thereby creating fluorescence light)
Implementation Method 2
utilizing the modulation of the stress and/or shearing on the diamond chip
Implementation Method 3
The means for modulating includes two or more acoustic modulators (each acoustic modulator generating a corresponding acoustic standing wave in the diamond chip)
Implementation Method 4
Microwaves, at a frequency of approximately 2.87 GHz, are applied to the NV-diamond chip to excite the B-field sensitive resonances, which change the fluorescence strength depending on the B-field strength
Data Source
AI summary
The present invention is directed to devices and systems for rapidly producing high resolution images of magnetic fields in a sample. The devices and systems employ diamond chips with color centers that fluoresce in the presence of magnetic fields. The high resolution is due to the use of one of three excitation methods. The first method employs modulation of an acoustic surface wave, which increases/decreases the sensitivity of the color centers to magnetic fields. The second and third methods employ arrays of magnetic field coils and electrode pairs, respectively, which again increase/decrease the sensitivity of the color centers to magnetic fields. The color centers are preferably nitrogen vacancies in the diamond chips.