Paper NS-WeM2
Time- Resolved Luminescence Nanothermometry with Nitrogen-Vacancy Centers in Nanodiamonds

Wednesday, October 21, 2015, 8:20 am, Room 212B

We have developed FNDs into a nanoscale luminescence thermometer for both temporally and spatially resolved temperature sensing with hosted NV^– centers, time-resolved luminescence nanothermometry was demonstrated with 100-nm FNDs spin-coated on a glass substrate and submerged in gold nanorod solution heated by a near-infrared laser, a pump-probe-type experiment that enables the study of nanoscale heat transfer with a temporal resolution of better than 10 μs. Moreover, we present a three-point sampling method that allows real-time monitoring of the temperature changes over ±100 K, an advantage of this three-point method is that it possesses a built-in ability for self-correction of signal fluctuation. To verify the validity of these measurements and to understand the heat transfer in the nanometer and microsecond scales, we carried out heat transfer numerical simulations. The simulated time constants for single exponential decays are τ = 20 μs at r = 1.0 μm and τ = 25 μs at r = 1.5 μm, compared with our experimental observations of 12 and 18 μs, respectively. Finally, the present study represents the first demonstration of thermometric investigation at the nanometric length scale with microsecond time resolution. It adds an important new dimension to the use of NV^– centers in diamond for quantum sensing applications.

Reference:

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