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Compact integration of NV-based diamond quantum sensors using a small-size photodiode and on-board transimpedance amplifier
Acharya, Bikram
Acharya, Bikram
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t25037_Acharya_B.pdf
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2025-07
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This thesis presents the development and characterization of a miniature NV-based diamond magnetometer for room-temperature magnetic field sensing, which combines an on-board transimpedance amplifier (TIA) and a high-responsivity photodiode. Using optically detected magnetic resonance (ODMR) in nitrogen-vacancy (NV) centres, Photoluminescence from NV is converted into voltage signals for magnetic field analysis.
Using a PDB-C171SM photodiode with a quantum efficiency of 0.65 and a responsivity of 0.25 A/W, a photocurrent of roughly 0.74 μA was generated at an optical power of 4.50 nW. The TIA achieved a gain of 59.2 MΩ and a -3 dB bandwidth of approximately 18 Hz when it was set up with a 50 MΩ feedback resistor and a 560 pF capacitor. ODMR detected the zero-field resonance at 2868.76 MHz $(R^2 = 0.988)$, and Zeeman splitting in an external magnetic field produced a frequency shift of 213.65 MHz, corresponding to a field strength of approximately 38.15 G.
Based on shot-noise-limited performance, the estimated magnetic field sensitivity was 26.53 nT/$\sqrt[]{Hz}$ with the photon detection rate of 1.44 × 10¹⁰ photons/s. These results validate the sensor’s capability for miniaturized, high-resolution, and low-power absolute magnetic field detection using NV centers.
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Thesis (M.S.)-- Wichita State University, College of Liberal Arts and Sciences, Dept. of Mathematics, Statistics, and Physics
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Wichita State University
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