Continuous-Wave Magnetic Field Sensing with Nitrogen-Vacancy Centers in Diamond

Sepehr Ahmadi

Research output: Book/ReportPh.D. thesisResearch

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Abstract

The nitrogen-vacancy center, a point defect in diamond, is a promising quantum sensor for magnetic field sensing with high sensitivity and high spatial resolution under ambient conditions. Such a magnetometer has potential applications in various fields, including neuroscience, microelectronics, and
nanoscale magnetic resonance microscopy.
This thesis presents cavity-enhanced magnetic field sensing using ensembles of nitrogen-vacancy centers in diamond. We apply a phase-sensitive detection method in our experiments and discuss our efforts regarding exploring the ideal modulation conditions. We demonstrate a ∼ 400 pT/√Hz magnetic noise density spanning a bandwidth up to 125 Hz, by measuring the changes in the fluorescence level. Using a five-level model for nitrogen-vacancy centers, a physical model is developed that shows excellent agreement with the measured optically detected magnetic resonance spectra.
Furthermore, we introduce an alternative technique for measuring the electron spin-states of nitrogen-vacancy centers based on recording the absorption of the pump light. This method is employed for magnetic field sensing, and a magnetic noise floor of ∼ 100 nT/√Hz is measured spanning a bandwidth up to 125 Hz. We modified the five-level model to describe the absorption detected magnetic resonance of a diamond placed inside an optical cavity. The model agrees very well with experiments.
Original languageEnglish
Place of PublicationLyngby, Denmark
PublisherTechnical University of Denmark
Number of pages100
Publication statusPublished - 2018

Cite this

Ahmadi, S. (2018). Continuous-Wave Magnetic Field Sensing with Nitrogen-Vacancy Centers in Diamond. Lyngby, Denmark: Technical University of Denmark.
Ahmadi, Sepehr. / Continuous-Wave Magnetic Field Sensing with Nitrogen-Vacancy Centers in Diamond. Lyngby, Denmark : Technical University of Denmark, 2018. 100 p.
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title = "Continuous-Wave Magnetic Field Sensing with Nitrogen-Vacancy Centers in Diamond",
abstract = "The nitrogen-vacancy center, a point defect in diamond, is a promising quantum sensor for magnetic field sensing with high sensitivity and high spatial resolution under ambient conditions. Such a magnetometer has potential applications in various fields, including neuroscience, microelectronics, andnanoscale magnetic resonance microscopy. This thesis presents cavity-enhanced magnetic field sensing using ensembles of nitrogen-vacancy centers in diamond. We apply a phase-sensitive detection method in our experiments and discuss our efforts regarding exploring the ideal modulation conditions. We demonstrate a ∼ 400 pT/√Hz magnetic noise density spanning a bandwidth up to 125 Hz, by measuring the changes in the fluorescence level. Using a five-level model for nitrogen-vacancy centers, a physical model is developed that shows excellent agreement with the measured optically detected magnetic resonance spectra. Furthermore, we introduce an alternative technique for measuring the electron spin-states of nitrogen-vacancy centers based on recording the absorption of the pump light. This method is employed for magnetic field sensing, and a magnetic noise floor of ∼ 100 nT/√Hz is measured spanning a bandwidth up to 125 Hz. We modified the five-level model to describe the absorption detected magnetic resonance of a diamond placed inside an optical cavity. The model agrees very well with experiments.",
author = "Sepehr Ahmadi",
year = "2018",
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publisher = "Technical University of Denmark",

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Ahmadi, S 2018, Continuous-Wave Magnetic Field Sensing with Nitrogen-Vacancy Centers in Diamond. Technical University of Denmark, Lyngby, Denmark.

Continuous-Wave Magnetic Field Sensing with Nitrogen-Vacancy Centers in Diamond. / Ahmadi, Sepehr.

Lyngby, Denmark : Technical University of Denmark, 2018. 100 p.

Research output: Book/ReportPh.D. thesisResearch

TY - BOOK

T1 - Continuous-Wave Magnetic Field Sensing with Nitrogen-Vacancy Centers in Diamond

AU - Ahmadi, Sepehr

PY - 2018

Y1 - 2018

N2 - The nitrogen-vacancy center, a point defect in diamond, is a promising quantum sensor for magnetic field sensing with high sensitivity and high spatial resolution under ambient conditions. Such a magnetometer has potential applications in various fields, including neuroscience, microelectronics, andnanoscale magnetic resonance microscopy. This thesis presents cavity-enhanced magnetic field sensing using ensembles of nitrogen-vacancy centers in diamond. We apply a phase-sensitive detection method in our experiments and discuss our efforts regarding exploring the ideal modulation conditions. We demonstrate a ∼ 400 pT/√Hz magnetic noise density spanning a bandwidth up to 125 Hz, by measuring the changes in the fluorescence level. Using a five-level model for nitrogen-vacancy centers, a physical model is developed that shows excellent agreement with the measured optically detected magnetic resonance spectra. Furthermore, we introduce an alternative technique for measuring the electron spin-states of nitrogen-vacancy centers based on recording the absorption of the pump light. This method is employed for magnetic field sensing, and a magnetic noise floor of ∼ 100 nT/√Hz is measured spanning a bandwidth up to 125 Hz. We modified the five-level model to describe the absorption detected magnetic resonance of a diamond placed inside an optical cavity. The model agrees very well with experiments.

AB - The nitrogen-vacancy center, a point defect in diamond, is a promising quantum sensor for magnetic field sensing with high sensitivity and high spatial resolution under ambient conditions. Such a magnetometer has potential applications in various fields, including neuroscience, microelectronics, andnanoscale magnetic resonance microscopy. This thesis presents cavity-enhanced magnetic field sensing using ensembles of nitrogen-vacancy centers in diamond. We apply a phase-sensitive detection method in our experiments and discuss our efforts regarding exploring the ideal modulation conditions. We demonstrate a ∼ 400 pT/√Hz magnetic noise density spanning a bandwidth up to 125 Hz, by measuring the changes in the fluorescence level. Using a five-level model for nitrogen-vacancy centers, a physical model is developed that shows excellent agreement with the measured optically detected magnetic resonance spectra. Furthermore, we introduce an alternative technique for measuring the electron spin-states of nitrogen-vacancy centers based on recording the absorption of the pump light. This method is employed for magnetic field sensing, and a magnetic noise floor of ∼ 100 nT/√Hz is measured spanning a bandwidth up to 125 Hz. We modified the five-level model to describe the absorption detected magnetic resonance of a diamond placed inside an optical cavity. The model agrees very well with experiments.

M3 - Ph.D. thesis

BT - Continuous-Wave Magnetic Field Sensing with Nitrogen-Vacancy Centers in Diamond

PB - Technical University of Denmark

CY - Lyngby, Denmark

ER -

Ahmadi S. Continuous-Wave Magnetic Field Sensing with Nitrogen-Vacancy Centers in Diamond. Lyngby, Denmark: Technical University of Denmark, 2018. 100 p.