All-optical single-nanoparticle ratiometric thermometry with a noise floor of 0.3 K Hz^−1/2

Abstract

We demonstrate a temperature noise floor of 0.3 K Hz(-1/2) and a long-term stability better than 0.6 K (peak-to-peak value) using a single crystal of diamond smaller than 50 nm across and containing about 100 nitrogen-vacancy centres as a temperature sensor. We compare the achieved characteristics to other single-particle sensors and show that it is one of the best ratiometric all-optical nano-probes of temperature to date.

Measuring Nanoscale Thermostability of Cell Membranes with Single Gold–Diamond Nanohybrids

“…TheZ PL center (l 0 )can be extracted by fitting the spectrum over 610-660 nm to aL orentzian function, along with an exponential function to correct the baseline. [13] Signal averaging over 6s by curve-fitting of 60 independent spectra yielded l 0 = 638.519 AE 0.013 nm for a9 5% confidence interval (inset in Figure 1b and Figure S2), which suggests at emperature measurement sensitivity of AE 2 8 8C/Hz 1/2 .…”

“…TheZ PL center (l 0 )can be extracted by fitting the spectrum over 610-660 nm to aL orentzian function, along with an exponential function to correct the baseline. [13] Signal averaging over 6s…”

“…3 E)o ft he NV À centers. [8][9][10][11][12][13] An exciting and appealing application of this new technology is to probe the local heat tolerance of living cells for ab etter understanding of hyperthermia at the nanoscale. [14] TheN V-based temperature sensors consist of 100-nm FNDs containing % 900 NV À centers per particle.The centers exhibit ab road emission band peaking at % 685 nm when exposed to 594 nm light ( Figure 1a).…”

Control of Spin Defects in Wide-Bandgap Semiconductors for Quantum Technologies

“…In the case of NV À centers, 532-nm (2.33-eV) excitation is commonly used. However, exciting along the 575-nm (2.16-eV) ZPL of the neutrally charged nitrogen-vacancy center ðNV 0 Þ aids in the stability of the NV À center [49], while exciting at 590 nm (2.10 eV) may be used to avoid the excitation of the other charge state altogether [50]. The charge stability of the electrostatic environment stems from other defects that are optically excited within the laser spot size.…”

Accuracy in the measurement of magnetic fields using nitrogen-vacancy centers in nanodiamonds

“…The NV center can then relax to its ground state through radiative and nonradiative pathways. The radiative transitions produce broad photoluminescence spectra with a zero-phonon line at 637 nm, which can be used for accurate measurements of temperatures [26,27]. The nonradiative transition is due to intersystem crossing (ISC) to singlet states situated below the excited triplet state.…”