Optically detected magnetic resonance of nitrogen-vacancy centers in diamond using two-photon excitation

TL;DR

This paper demonstrates two-photon excitation for ODMR of nitrogen-vacancy centers in diamond at room temperature, enabling 3D quantum sensing and imaging with improved spatial mapping.

Contribution

First demonstration of ODMR of NV centers using two-photon excitation, opening new avenues for quantum sensing and high-resolution imaging.

Findings

Successfully observed ODMR traces with two-photon excitation

Mapped NV center distribution in bulk and micro-diamonds

Showed potential for fast 3D quantum sensing and imaging

Abstract

We demonstrate the use of two-photon excitation for observing the ground state optically detected magnetic resonance (ODMR) of nitrogen-vacancy centers in diamonds at room temperature. An ultrafast femtosecond laser at 1040 nm was used for excitation, while fluorescence signal read out was achieved through a combination of a PMT and a lock-in amplifier. The imaging capability of two-photon excitation fluorescence (2PEF) was utilized to map the distribution of NV centers in a bulk diamond and micro-sized diamonds. For the first time, ODMR traces of the nitrogen-vacancy center are observed with two-photon excitation, providing a promising tool for fast 3D quantum sensing and imaging.