Josephson Junction Sensor Array for High-Resolution Magnetic Imaging
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Solution Overview
Problem
Magnetic microscopes typically operate at low frequencies due to the need for a scanning probe, limiting their ability to detect magnetic fields effectively across a broad frequency range and with high spatial resolution.
Innovation Solution
A sensor array with Josephson junctions that passively detects magnetic fields without scanning, using superconducting loops to generate electrical signals responsive to magnetic flux, enabling high spatial resolution imaging with submicron sensitivity across a broad frequency band from DC to GHz.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single sensing tip is scanned over the probed area to detect magnetic field, then the local magnetic field can be detected, but the operation frequency is limited to low frequencies and the imaging process is time-consuming
Solution Approach 1:
The patent divides the single sensing tip into a sensor array comprising multiple sensor pixels, where each pixel contains one or more Josephson junctions. This segmentation allows simultaneous detection of magnetic fields across multiple locations, transforming the sequential scanning process into parallel measurement, thereby dramatically improving imaging speed while maintaining detection precision.
Solution Approach 2:
The patent replaces the mechanical scanning system with a stationary sensor array. Instead of physically moving a single probe across the sample, the system uses an array of Josephson junctions that can simultaneously detect magnetic fields at multiple positions. This substitution eliminates mechanical limitations and enables high-frequency operation up to GHz ranges.
2Device complexity
If a single sensing tip is used for magnetic field detection, then the device structure is simple, but the spatial resolution and frequency response are limited
Solution Approach 1:
The sensor is segmented into multiple pixels, each containing Josephson junctions that can be independently addressed. This segmentation enables high spatial resolution by allowing precise localization of magnetic field measurements across the array, while the modular pixel structure maintains relative simplicity in fabrication.
Solution Approach 2:
The patent changes the fundamental operating parameters by using Josephson junctions based on quantum tunneling effects rather than classical magnetic sensing mechanisms. This parameter change enables submicron spatial resolution and GHz frequency response, dramatically improving performance while the junctions can be fabricated using standard thin-film techniques.
3Force
If magnetic pixels with active magnetized material are used to generate local magnetic field, then the magnetic field interaction with probed surface is enhanced, but the device complexity increases due to separate detectors required for each maxel
Solution Approach 1:
Instead of using magnetized materials to generate magnetic fields and then detecting them, the patent inverts the approach by using Josephson junctions that directly sense magnetic flux through quantum effects. This inversion eliminates the need for separate active magnetized materials and their associated detectors, simplifying the overall device structure while maintaining or enhancing magnetic field interaction capability.
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
Enables the capture of magnetic images with high spatial resolution and sensitivity, detecting minute changes in magnetic fields without scanning, applicable in various fields such as medicine, mineralogy, and magnetometry.
Implementation Method 1
each include at least one Josephson junction for generating an electrical signal responsive to a magnetic flux of the magnetic field through the sensor pixel
Data Source
AI summary
An imager of a magnetic field includes a sensor array and a display. The sensor array includes sensor pixels, which each include at least one Josephson junction for generating an electrical signal responsive to a magnetic flux of the magnetic field through the sensor pixel. The display is coupled to the sensor array for displaying, for each of the sensor pixels, a respective strength from the electrical signal of the magnetic flux through the sensor pixel.