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Simultaneous thermometry and magnetometry using a fiber-coupled quantum diamond sensor

At a Glance

Section titled ā€œAt a Glanceā€
MetadataDetails
Publication Date2021-01-18
JournalApplied Physics Letters
AuthorsYuji Hatano, Jae-Won Shin, Daisuke Nishitani, Haruki Iwatsuka, Y. MASUYAMA
InstitutionsYazaki (Japan), Tokyo Institute of Technology
Citations52

Abstract

Section titled ā€œAbstractā€

Energy conservation and battery life extension are key challenges for the next-generation hybrid electric vehicles. In particular, the temperature and electric currents in a storage battery need to be monitored simultaneously with āˆ¼1 kHz signal bandwidth for optimum battery usage. Here we introduce a centimeter-scale portable quantum sensor head, consisting of a diamond substrate hosting an ensemble of nitrogen-vacancy (NV) color centers with a density of āˆ¼3 Ɨ 1017 cmāˆ’3. One diamond surface is attached to a multi-mode fiber for simultaneous optical excitation and readout of the NV centers, while the other diamond surface is attached to a coplanar microwave guide for NV spin ground-state mixing. Signal bandwidth of 1 kHz was realized through time-domain multiplexing of the two-tone microwave frequency modulation at 20 kHz. Two microwave frequencies were locked to the two resonance points that were determined from the optically detected magnetic resonance spectrum. From the mean and the difference of the deviation from the two locked frequencies, the temperature and magnetic field were obtained simultaneously and independently, with sensitivities of 3.5 nT/Hz1/2 and 1.3 mK/Hz1/2, respectively. We also showed that our sensor reached a minimum detectable magnetic field of 5 pT by accumulating signals for over 10 000 s.

Tech Support

Section titled ā€œTech Supportā€

Original Source

Section titled ā€œOriginal Sourceā€

References

Section titled ā€œReferencesā€
  1. 2008 - High-sensitivity diamond magnetometer with nanoscale resolution [Crossref]
  2. 2008 - Nanoscale imaging magnetometry with diamond spins under ambient conditions [Crossref]
  3. 2008 - Nanoscale magnetic sensing with an individual electronic spin in diamond [Crossref]
  4. 2013 - Timekeeping with electron spin states in diamond [Crossref]
  5. 2013 - Nanometre-scale thermometry in a living cell [Crossref]
  6. 2013 - Fluorescence thermometry enhanced by the quantum coherence of single spins in diamond [Crossref]
  7. 2016 - Optical magnetic detection of single-neuron action potentials using quantum defects in diamond [Crossref]
  8. 2019 - Nanotesla sensitivity magnetic field sensing using a compact diamond nitrogen-vacancy magnetometer [Crossref]
  9. 2019 - Compact integrated magnetometer based on nitrogen-vacancy centres in diamond [Crossref]
  10. 2020 - A hand-held magnetometer based on an ensemble of nitrogen-vacancy centers in diamond [Crossref]

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