VCSEL Threshold Magnetometer With Diamond NV Sensing Layer
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Solution Overview
Problem
Conventional threshold magnetometers are bulky, expensive, and prone to external biases due to environmental factors, making them unsuitable for navigation applications.
Innovation Solution
A vertical cavity surface-emitting laser (VCSEL) based threshold magnetometer with a diamond layer containing nitrogen vacancy centers is used, which absorbs or intensifies light within an optical resonator, allowing for higher sensitivity measurements by modifying the absorption rate based on transmission frequency, reducing size, weight, and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional free space optics are used in threshold magnetometers, then the measurement function is achieved, but the device becomes bulky and expensive
Solution Approach 1:
The patent replaces conventional free space optical systems with an integrated VCSEL-based system where the optical resonator and detection functions are combined in a single compact device. The vertical cavity surface-emitting laser integrates the light source, resonator, and detection capabilities in one structure, eliminating the need for separate optical components and reducing overall device size while maintaining measurement precision.
Solution Approach 2:
The patent merges multiple functions into the VCSEL structure: the probe light source, optical resonator with reflecting elements, and detection capabilities are all integrated into a single vertical cavity device. This consolidation reduces the number of separate components needed in conventional magnetometers, thereby reducing device complexity and size while preserving the magnetic field detection function.
2Measurement precision
If conventional threshold magnetometers are used, then magnetic field measurement is possible, but they are prone to external biases from environmental factors
Solution Approach 1:
The patent utilizes the nonlinear optical response of the VCSEL resonator near threshold conditions. By operating the resonator close to its threshold and measuring the nonlinear response to pump light modulation, the system achieves high sensitivity to magnetic field changes while the confined optical mode within the VCSEL cavity reduces sensitivity to external environmental biases compared to free space systems.
3Measurement precision
If conventional magnetometer designs are used, then the detection function is provided, but size, weight, and power consumption are high
Solution Approach 1:
The patent replaces bulky mechanical and optical components with a compact VCSEL-based photonic system. The vertical cavity surface-emitting laser uses semiconductor laser diodes and integrated optical resonators that are significantly lighter than conventional free space optical systems, reducing overall device weight while maintaining magnetic field detection capability.
4Measurement precision
If conventional magnetometer designs are used, then the detection function is provided, but power consumption is high
Solution Approach 1:
The patent operates the VCSEL resonator near threshold conditions and uses nonlinear optical response to enhance detection sensitivity. This approach allows for reduced pump power requirements compared to conventional systems, as the nonlinear response near threshold provides amplification of the measurement signal, thereby reducing overall power consumption while maintaining detection 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
The VCSEL magnetometer provides high sensitivity and robustness for magnetic field detection, enabling navigation applications with reduced size, weight, and power consumption.
Implementation Method 1
The first material, in response to optical contact from pump light at an excitation frequency of the first material, absorbs or intensifies light propagating in the optical resonator
Implementation Method 2
The VCSEL comprises a first layer comprising at least one first reflecting or scattering element configured to receive the probe light. The VCSEL comprises a third layer comprising at least one second reflecting or scattering element configured to reflect or scatter the probe light
Data Source
AI summary
A threshold magnetometer includes a vertical cavity surface-emitting laser with a first material that is disposed in one of the layers. The first material is configured as an absorbent material or emission material to light propagating in the optical resonator. As an absorbent material, the first material absorbs light when exposed to radio frequency (RF) radiation at one or more resonant frequencies. As an emission material, the first material intensifies light when exposed to RF radiation at one or more resonant frequencies. The resultant intensity change can be detected and used to determine characteristics of an external magnetic field.