Dielectric Resonator Spin Sensor Without Lasers or Photodetectors
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Solution Overview
Problem
Conventional solid-state spin sensors for measuring physical parameters like magnetic fields require lasers, external microwave sources, and photodetectors, which complicates their operation and reduces their portability and ruggedness.
Innovation Solution
A self-sustaining oscillator system using a dielectric resonator with paramagnetic defects that encodes physical parameters in its oscillation frequency, eliminating the need for external microwave sources and photodetectors, and utilizing a sustaining amplifier and digitizer to process the microwave signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional ODMR measurement systems are used, then measurement sensitivity is achieved, but device complexity increases due to requirements for lasers, external microwave sources, and photodetectors
Solution Approach 1:
The patent combines the functions of the dielectric resonator, microwave source, and detector into a single integrated system. The resonator both generates and detects microwave signals, eliminating the need for separate external microwave sources and photodetectors while maintaining measurement sensitivity through the spin-defect-resonator coupling mechanism.
Solution Approach 2:
The dielectric resonator serves multiple functions simultaneously: it acts as the microwave cavity, the sensing element through spin-defect interaction, and the detection mechanism through quality factor changes. This multi-functionality reduces overall device complexity while preserving measurement capabilities.
2Measurement precision
If conventional ODMR measurement systems are used, then physical parameter measurement capability is achieved, but portability and ruggedness are reduced
Solution Approach 1:
By integrating all measurement functions into a single resonator-based system, the patent eliminates multiple external components that would require careful alignment and protection. The unified structure is inherently more portable and rugged while maintaining full measurement capability.
3Measurement precision
If conventional ODMR measurement systems are used, then fluorescence-based measurement is achieved, but power consumption increases
Solution Approach 1:
The patent replaces the optical detection mechanism (lasers and photodetectors requiring high power) with a microwave-based quality factor detection method. The resonator's quality factor changes provide the same measurement information with significantly lower power consumption, as microwave resonators can operate with minimal energy input.
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 highly sensitive measurements of magnetic fields and other physical parameters without the need for lasers or photodetectors, resulting in a more compact, rugged, and simpler sensor design with lower power consumption.
Implementation Method 1
The paramagnetic defects have energy levels that change in response to changes in a physical parameter. The resonance frequency of the dielectric resonance can be tuned near the zero field splitting of the paramagnetic defects
Implementation Method 2
the solid-state host is connected to a sustaining amplifier in a feedback loop to form a self-sustaining oscillator whose oscillation frequency depends on the physical parameter(s) measured by the sensor
Implementation Method 3
The sensor uses transmission of microwave probe radiation through a dielectric resonator, at least part of which is magnetically sensitive, as an element of the self-sustaining oscillator
Data Source
AI summary
We have developed a high-performance, low-volume, low-weight, and low-power sensor based on a self-sustaining oscillator. The techniques described here may be used for sensing various fields; we demonstrate magnetic sensing. The oscillator is based on a dielectric resonator that contains paramagnetic defects and is connected to a sustaining amplifier in a feedback loop. The resonance frequency of the dielectric resonator shifts in response to changes in the magnetic field, resulting in a shift in the frequency of the self-sustaining oscillator. The value of the magnetic field is thereby encoded in the shift or modulation output of the self-sustaining oscillator. The sensor as demonstrated uses no optics, no input microwaves, and, not including digitization electronics, consumes less than 300 mW of power and exhibits a sensitivity at or below tens of pT/â{square root over (Hz)}. In some implementations, the sensor is less than 1 mL in volume.