2024/10/28 by Ali Tayefeh Younesi, Muhib Omar, Younesi, Ali Tayefeh +7 · 5 citations
Earth and Planetary Sciences · Materials Science · Physics and Astronomy · #Applied Physics (physics.app-ph) #Atomic and Subatomic Physics Research #Diamond and Carbon-based Materials Research #FOS: Physical sciences #High-pressure geophysics and materials #Quantum Physics (quant-ph)
paper · pdf · doi:10.48550/arxiv.2410.20876
openalex publication_date 2024/10/28 · openalex created_date 2024/11/14 · openalex updated_date 2026/07/28
The negatively-charged nitrogen vacancy (NV-) center in diamond is widely used for quantum sensing since the sensitivity of the spin triplet in the electronic ground state to external perturbations such as strain and electromagnetic fields make it an excellent probe for changes in these perturbations. The spin state can be measured through optically detected magnetic resonance (ODMR), which is most commonly achieved by detecting the photoluminescence (PL) after exciting the spin-triplet transition. Recently, methods have been proposed and demonstrated that use the absorption of the infrared singlet transition at 1042 nm instead. These methods however require cryogenic temperatures or external cavities to enhance the absorption signal. Here, we report on our optimization efforts of the magnetometer sensitivity at room temperature and without cavities. We reach sensitivities of 18 pT/√(Hz), surpassing previously reported values. We also report on a defect that is native to CVD-grown diamond and thus absent in HPHT diamond, the excitation of which impacts the measured singlet absorption signal.