Diamond Resonator Magnetometry for Earth-Field Vector Sensing
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Solution Overview
Problem
Current magnetic field measurement technologies, such as SQUID devices and atomic based magnetometry, face challenges including high size and power consumption, inability to operate in earth fields, and require multiple sensors for vector information, limiting their applicability in navigation and other applications.
Innovation Solution
A magnetometer system utilizing a diamond-based nonlinear waveguide with nitrogen vacancy centers in an optical resonator, where the absorbent material adjusts the threshold power level for nonlinear photon generation, allowing for sensitive magnetic field detection with reduced size, weight, and power consumption, and the ability to operate in earth fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SQUID devices are used for magnetic field measurement, then high sensitivity is achieved, but size and power consumption increase due to cryogenic refrigeration requirements
Solution Approach 1:
The patent replaces the mechanical cryogenic refrigeration system of SQUID devices with an optical-based detection system using a diamond resonator. The diamond resonator utilizes optical pumping and nonlinear optical effects to achieve magnetic field sensing without requiring cryogenic temperatures, thereby eliminating the bulky refrigeration machinery while maintaining high sensitivity through optical resonance detection.
Solution Approach 2:
The patent changes the operating temperature parameter from cryogenic (SQUID) to room temperature (diamond resonator). By utilizing the unique optical properties of diamond at room temperature, including its high quality factor resonances and nonlinear optical susceptibility, the system achieves sensitivity comparable to cryogenic systems without the weight penalty of refrigeration equipment.
2Measurement precision
If atomic based magnetometers are used, then high sensitivity is achieved, but the ability to operate in earth fields is lost
Solution Approach 1:
The patent changes the operating conditions of the magnetometer to enable earth field compatibility. The diamond resonator system is designed to operate in the presence of static earth magnetic fields by using optical pumping schemes that are insensitive to DC field offsets. The system detects AC magnetic field variations superimposed on the earth field through changes in resonance frequency and quality factor, enabling both high sensitivity and earth field operation.
3Loss of information
If three sensors are used to provide vector information, then complete vector measurement is achieved, but device complexity increases
Solution Approach 1:
The patent makes a single diamond resonator sensor perform the function of multiple sensors by utilizing the vector nature of optical pumping. By applying pump beams from different orientations and analyzing the resulting resonance shifts, a single diamond resonator can extract all three components of the magnetic field vector, eliminating the need for three separate sensors while maintaining complete vector measurement 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 high-sensitivity magnetic field detection with low size, weight, and power consumption, capable of operating in earth fields and providing vector information without the need for multiple sensors, enhancing navigation and other magnetic-based applications.
Implementation Method 1
a first optical resonator having nonlinear photon generation properties coupled to the at least one optical pathway. The first optical resonator is configured to increase an intensity of light having a first frequency
Implementation Method 2
When the intensity of the light having the first frequency exceeds a first threshold power level, the first optical resonator undergoes a nonlinear photon generation process to generate photons at a second frequency different from the first frequency
Implementation Method 3
The absorbent material is configured, in response to being excited by light having a third frequency that corresponds to an excitation frequency of the absorbent material, to absorb the light having the first frequency
Data Source
AI summary
A photonics device for threshold magnetometry includes an absorbent material with nonlinear optical susceptibility, such as a diamond material with nitrogen vacancy defects, that is disposed in an optical resonator. The optical resonator receives light from an input source and includes nonlinear optical properties that enable the resonator to undergo a nonlinear photon generation process at a certain threshold power level to generate photons at distinct frequencies from the input light. The absorbent material absorbs photons entering the resonator when excited, which causes the threshold power level to shift as a function of the absorption. This may cause the optical resonator to stop generating photons via the nonlinear photon generation process and output a change in power. The change in power can be used to determine the characteristics of a present magnetic field.