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

TL;DR

This paper demonstrates a low power, high-resolution nanoscopy technique using near-infrared light to enhance charge state conversion in nitrogen vacancy centers in diamond, enabling improved quantum sensing.

Contribution

The study introduces a novel low power charge state depletion nanoscopy method utilizing NIR light, achieving 14 nm resolution with significantly reduced laser power.

Findings

Achieved 14 nm spatial resolution.

Reduced laser power by three orders of magnitude.

Enhanced charge state conversion with NIR laser.

Abstract

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