Optical Science and Engineering ETDs

Publication Date

Fall 7-29-2025

Abstract

Two methods for improving the sensitivity of nitrogen vacancy quantum sensors in diamond are explored. First, by passively concentrating the magnetic flux, three orthogonally oriented ferrite truncated cone pairs amplify the field isotropically by 19 times, allowing measurement of Earth's field without a bias field and increasing sensitivity. Through thorough analysis, modeling and tuning a novel 3-dimensional flux concentrator system, we achieve a fractional standard deviation of less than 1% anisotropy and quantify minimal deadzones and ambient temperature-limited variations below 40 nT/hour. Second, we characterize, model and calculate phase noise in NV experiments, which in NV sensors is effectively indistinguishable from magnetic field noise. We then discuss and implement experimental methods to mitigate phase noise by a factor of 10-12.

Degree Name

Optical Science and Engineering

Level of Degree

Doctoral

Department Name

Optical Science and Engineering

First Committee Member (Chair)

Dr. Victor Acosta

Second Committee Member

Dr. Keith Lidke

Third Committee Member

Dr. Tara Drake

Fourth Committee Member

Dr. Terefe Habteyes

Keywords

nitrogen vacancy, quantum sensing, magnetic resonance, phase noise, flux concentrator, magnetometer

Document Type

Dissertation

Language

English

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