Diamond NV Center Magnetometer for Nanoscale Magnetic Field Sensing

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Solution Overview

Problem

Current magnetic sensors face challenges in detecting weak magnetic fields with high precision and spatial resolution, especially in small regions and under ambient environmental conditions.

Innovation Solution

A solid-state magnetometer system utilizing electronic spins, such as Nitrogen vacancy centers in diamond, which aligns with magnetic fields through optical radiation and undergoes a Zeeman shift in response to RF fields, allowing for high sensitivity detection using optical and RF probing techniques.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional magnetic sensors (SQUIDs, atomic vapor-based magnetometers) are used, then magnetic field detection capability is achieved, but spatial resolution and detection precision in small regions deteriorate

Engineering Contradiction:

Improvemagnetic field detection precisionVSAvoidspatial resolution

Core Design Contradiction:

Measurement precisionVSArea of stationary object

Solution Approach 1:

The patent changes the physical state parameter of the sensing medium from gaseous (atomic vapor) or macroscopic (SQUID) to solid-state (diamond NV centers), enabling simultaneous achievement of high spatial resolution and magnetic field detection precision through the solid-state lattice structure

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces conventional magnetic sensing mechanisms (superconducting interference in SQUIDs, atomic vapor resonance) with solid-state electronic spin resonance in diamond NV centers, enabling nanometer-scale spatial resolution while maintaining high magnetic field detection sensitivity

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If conventional magnetic sensors are used, then magnetic field detection is achieved, but detection sensitivity for weak fields in small regions deteriorates

Engineering Contradiction:

Improvedetection sensitivityVSAvoidsensing volume

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

The patent changes the sensing mechanism from macroscopic or gaseous systems to solid-state quantum spin systems, enabling high detection sensitivity for weak magnetic fields within nanometer-scale volumes through the localized nature of NV centers in the diamond lattice

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent extracts the magnetic sensing function to the atomic-scale NV center defect in diamond, isolating the sensing element from environmental noise and enabling high sensitivity detection in small volumes by removing unwanted interactions with the surrounding lattice

Inventive Principle:

Principle #2Taking out (Extraction)

3Area of stationary object

If solid state electronic spin system is used, then spatial resolution is improved to nanometer scale, but interaction with solid state lattice may cause decoherence

Engineering Contradiction:

Improvespatial resolutionVSAvoidspin coherence

Core Design Contradiction:

Area of stationary objectVSReliability

Solution Approach 1:

The patent uses optical radiation as an intermediary to probe and control the electronic spin state of NV centers, enabling spatial resolution at the nanometer scale while the optical interface allows for coherent manipulation without direct mechanical interaction that would cause decoherence

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent exploits the chemically inert and structurally rigid diamond lattice as an environment that protects the NV center electronic spins from decoherence, creating a stable quantum system that maintains spin coherence while enabling nanometer-scale spatial resolution

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

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 nanometer-scale spatial resolution and high magnetic field sensitivity, improving detection capabilities beyond existing technologies like SQUIDs and atomic vapor-based magnetometers.

Implementation Method 1

The electronic spin or spins may be configured to align with the magnetic field in response to optical radiation applied thereto

Methodology Applied

Scientific EffectOptical pumping:

Implementation Method 2

The electronic spin or spins may be further configured to undergo a Zeeman shift in energy level that is proportional to the magnetic field to be sensed

Methodology Applied

Scientific EffectZeeman effect: Zeeman Effect

Data Source

PatentUS8947080B2High sensitivity solid state magnetometer

Publication Date: 2015.02.03 PRESIDENT & FELLOWS OF HARVARD COLLEGE

AI summary

A magnetometer for sensing a magnetic field may include a solid state electronic spin system, and a detector. The solid state electronic spin system may contain one or more electronic spins that are disposed within a solid state lattice, for example NV centers in diamond. The electronic spins may be configured to receive optical excitation radiation and to align with the magnetic field in response thereto. The electronic spins may be further induced to precess about the magnetic field to be sensed, in response to an external control such as an RF field, the frequency of the spin precession being linearly related to the magnetic field by the Zeeman shift of the electronic spin energy levels. The detector may be configured to detect output optical radiation from the electronic spin, so as to determine the Zeeman shift and thus the magnetic field.