On-Chip Excitation and Readout for Magnetic Sensing Arrays
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Solution Overview
Problem
Current defect-based sensors face inefficiencies in signal-to-noise ratios due to internal reflection losses in optical readout mechanisms and require large, aligned optical equipment, limiting their effectiveness in measuring electromagnetic fields and mechanical forces at the nanoscale.
Innovation Solution
A high-density array of atomic defect sensors utilizing atomic defects as magnetometers, with integrated optical waveguides and customized electronic doping profiles for electrical readout, enabling sub-micron spatial resolution and portable operation by generating photocurrents in response to magnetic, electric, or temperature fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical detection of fluorescence is used for readout, then sensing capability is achieved, but signal-to-noise ratio is limited due to internal reflection losses
Solution Approach 1:
The patent replaces the optical detection mechanism with an electrical readout mechanism. Instead of detecting fluorescence photons through optical paths suffering from internal reflection losses, the invention uses electrical contacts to directly measure the spin state of defect centers through conductivity changes or charge detection, eliminating the optical loss pathway entirely
Solution Approach 2:
The patent introduces an intermediary mechanism (electrical field or charge carriers) to mediate the readout process. Rather than directly detecting optical signals, the spin state information is transduced into electrical signals through an intermediate physical process, allowing indirect but more efficient measurement that avoids optical losses
2Ease of operation
If conventional defect-based sensors are used, then sensing function is achieved, but large table-top optical equipment is required with complex alignment
Solution Approach 1:
The patent replaces the complex optical system (lenses, mirrors, alignment mechanisms) with a compact electrical measurement system. Electrical contacts and readout circuits are much smaller and do not require precise mechanical alignment, dramatically simplifying the system while maintaining sensing capability
Solution Approach 2:
The patent transitions from an optical dimension (photon detection requiring line-of-sight and alignment) to an electrical dimension (charge or conductivity measurement). This dimensional change allows for planar integration and eliminates the need for three-dimensional optical alignment, reducing system complexity
3Ease of operation
If optical readout is used, then sensing is possible, but portability is limited due to bulky equipment requirements
Solution Approach 1:
The patent substitutes heavy optical components with lightweight electrical measurement circuits. Electrical readout electronics can be miniaturized and integrated onto chips, whereas optical systems require bulky lenses, light sources, and detectors that are difficult to miniaturize
Solution Approach 2:
The patent merges the sensing element (defect center) and readout mechanism (electrical contacts) into a single integrated structure. This integration eliminates the need for separate optical components and their supporting infrastructure, enabling portable applications
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 solution achieves a significant improvement in signal-to-noise ratios, up to 100 times larger than conventional technologies, and allows for precise, portable measurement of physical parameters with high spatial resolution and sensitivity, eliminating the need for bulky optical equipment.
Implementation Method 1
an atomic defect site configured to be excited by light of a first frequency
Implementation Method 2
generating a photocurrent corresponding to a magnitude of a physical parameter
Data Source
AI summary
A sensing array includes a plurality of pixels, one pixel of which includes: a sensor, the sensor including a first electrode, a second electrode, and an atomic defect site configured to be excited by light of a first frequency; a light source below the sensor and configured to emit light of the first frequency toward the defect site; and a radio frequency (RF) source below the sensor and configured to provide a first voltage to the first electrode, a second voltage to the second electrode, and an RF signal to the sensor, wherein the sensor is configured to sense a magnitude of a physical parameter by generating a photocurrent corresponding to a magnitude of a physical parameter and a differential between the first and second voltages, when excited by the light of the first frequency and affected by the RF signal.