Optical Matching Material for NV Diamond Sensor Signal Transmission
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Solution Overview
Problem
Current NV diamond magnetic sensing systems face limitations in sensitivity and efficiency due to optical mismatching between the NV diamond sensor and optical fiber, leading to reduced fluorescence signal transmission and measurement accuracy.
Innovation Solution
The use of an optical matching material between the NV diamond sensor and the optical fiber, which matches the refractive index of the fiber core, enhances signal transmission by minimizing reflection and scattering, and the implementation of a high-resolution spectrometer to distinguish between photons emitted from different spin states, allowing for more precise magnetic field measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If direct coupling between optical fiber and NV diamond sensor is used, then device complexity is reduced, but optical mismatching causes signal loss and measurement precision deteriorates
Solution Approach 1:
An optical matching material is introduced as an intermediary between the optical fiber and NV diamond sensor. This material has a refractive index that is optically matched to both the optical fiber core and the NV diamond sensor, serving as a refractive index transition medium. The matching material minimizes reflection and scattering at the interfaces, thereby reducing signal loss while maintaining a relatively simple overall system structure.
2Device complexity
If conventional optical detection is used, then device complexity is low, but sensitivity and signal transmission efficiency are insufficient
Solution Approach 1:
The patent employs a high-resolution spectrometer to detect fluorescence signals from the NV diamond sensor. The spectrometer operates by dispersing the fluorescence spectrum and detecting it with high resolution, enabling precise differentiation between photons emitted from different spin states. This parameter-based detection approach significantly improves signal transmission efficiency and measurement reliability compared to conventional optical detection methods.
3Device complexity
If fluorescence signal is transmitted directly without optimization, then system simplicity is maintained, but signal loss due to reflection and scattering occurs
Solution Approach 1:
The optical matching material acts as a mediator between the optical fiber and NV diamond sensor, creating a refractive index gradient that reduces optical mismatching. By having the matching material's refractive index fall between that of the optical fiber core and the NV diamond sensor, the system minimizes Fresnel reflections and scattering losses at the interfaces, thereby preserving fluorescence signal intensity without adding complex optical coupling structures.
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 improves the sensitivity and accuracy of magnetic field measurements by increasing the efficiency of signal transmission and enabling the differentiation of photons from different spin states, resulting in a higher contrast and more reliable data collection.
Implementation Method 1
an optical matching material between the NV diamond sensor and the optical fiber, which matches the refractive index of the fiber core, enhances signal transmission by minimizing reflection and scattering
Implementation Method 2
systems that utilize NV diamond centers to measure the magnetic field of a sample based on changes in the fluorescence produced by the NV diamond center
Data Source
AI summary
In an approach to measuring a magnetic field of a sample, a system includes an optical fiber comprising a first end and a second end, the optical fiber having a core; and a nitrogen vacancy (NV) diamond sensor; where the first end of the optical fiber is configured to receive excitation light from an optical excitation source; and the NV diamond sensor is coupled to the second end of the optical fiber with an optical matching material, the optical matching material configured to optically match the NV diamond sensor to the core of the optical fiber.