Measurement and Simulation of Thermal Distributions Across a Quantum Diamond Sensor With Nitrogen-Vacancy CentersPublic
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A Quantum Diamond Microscope (QDM) is a device that is used to image magnetic fields and temperature distributions with nitrogen-vacancy (NV) centers in a diamond chip. Because the QDM uses a laser to excite the NV centers, there can be significant heating of the diamond chip along with the samples that are being measured. As a result, some samples of interest may become damaged; thus, it is important to characterize the temperature distribution across the NV diamond sensor. Through the use of Optically Detected Magnetic Resonance (ODMR) spectroscopy, thermal distributions across the diamond chip are measured, and the thermal effects of different imaging conditions are characterized. For typical operating conditions of 2.4 W of laser power and a 2.10 mm diameter Gaussian laser beam, the maximum temperature across the diamond sensor is 132 °C and the minimum temperature is 129 °C, and it takes about 4 minutes to reach thermal equilibrium. Thermal simulations are also conducted and experimentally verified in order to predict expected temperature distributions of the QDM. This work can serve as a starting point for developing methods to improve heat dissipation to be able to safely image samples that are sensitive to heat.
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