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The near-infrared (NIR) optical pumped photophysics of nitrogen vacancy (NV)center in diamond was experimentally studied by considering both the chargestate conversion and stimulated emission. We found that the NIR laser can helpto highly enhance the charge state conversion rate, which can be applied toimprove the performance of charge state depletion nanoscopy. Using adoughnut-shaped visible laser beam and a Gaussian-shaped NIR laser beam forcharge state manipulation, we developed a low power charge state depletionnanoscopy for NV center. A spatial resolution of 14 nm was achieved with thedepletion laser intensity approximately three orders lower than that used forthe stimulated emission depletion nanoscopy with NV center. With high spatialresolution and low laser power, the nanoscopy can be used for nanoscale quantumsensing with NV center. And our study on the charge state conversion can helpto further optimize the NV center spin state initialization and detection.

Near-infrared-enhanced charge state conversion for low power optical nanoscopy with nitrogen vacancy center in diamond