Ultra-Sensitive Two-Dimensional Integrated Quantum Thermometer Module Based on the Optical Detection of Magnetic Resonance Using Nitrogen-Vacancy Centers

In this paper, we propose a two-dimensional thermometer module based on the Nitrogen-Vacancy (NV) centers in diamonds. The thermometer integrates four modules on one Printed Circuit Board (PCB) including a laser module and a corresponding voltage regulator circuit, a microwave module, a focusing module, and an acquisition module, and it has a constructed area of 6.4
${\textit {cm}}^{{2}}$
. In the process of integrating equipment, we made a signal amplifier module to improve the signal-to-noise ratio (SNR). Through the amplifier module, we realize a
$\sim 25$
-fold increase in the fluorescence, and it successfully improved the SNR by
$\sim 8.9$
-fold. Fixed Frequency Optical Detection of Magnetic Resonance (FF-ODMR) measures the relationship between temperature (T) and photoluminescence (PL) by scanning the temperature field at 2.84GHz. Which is the most direct display of the thermometer. We developed an algorithm for analyzing the thermometer sensitivity based on PL the SNR analysis. The thermometer temperature-field sensitivity of approximately
${19}\textit {nk}/{\textit {Hz}}^{{1}/{2}}$
.