Temperature selective thermometry with sub-microsecond time resolution using dressed-spin states in diamond

TL;DR

This paper introduces a microwave-dressed spin state scheme in diamond quantum sensors enabling sub-microsecond temperature measurements with high sensitivity and magnetic field insensitivity, advancing nanoscale thermometry.

Contribution

It presents a novel dressed-spin state approach for optically detected nanoscale temperature sensing with high temporal resolution and magnetic field robustness.

Findings

Achieved 3.7 K/Hz^{1/2} thermal sensitivity.

Demonstrated sub-microsecond temporal resolution.

Sensor insensitive to 2 G magnetic field variations.

Abstract

Versatile nanoscale sensors that are susceptible to changes in a variety of physical quantities often exhibit limited selectivity. This paper reports a novel scheme based on microwave-dressed spin states for optically probed nanoscale temperature detection using diamond quantum sensors, which provides selective sensitivity to temperature changes. By combining this scheme with a continuous pump-probe scheme using ensemble nitrogen-vacancy centers in nanodiamonds, a sub-microsecond temporal resolution with thermal sensitivity of 3.7 K$\cdot$Hz$^{-1/2}$ that is insensitive to variations in external magnetic fields on the order of 2 G is demonstrated. The presented results are favorable for the practical application of time-resolved nanoscale quantum sensing, where temperature imaging is required under fluctuating magnetic fields.