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6CCVD Research

Detection of sub-nanotesla magnetic fields by linewidth narrowing in high-density nitrogen vacancy magnetometry with pulsed ESR method

At a Glance

Section titled ā€œAt a Glanceā€
MetadataDetails
Publication Date2021-08-13
JournalJapanese Journal of Applied Physics
AuthorsYangang Zhang, Xiaocheng Wang, Junqi Wang, Doudou Zheng, Liumin Niu
InstitutionsNorth University of China, The University of Osaka
Citations4

Abstract

Section titled ā€œAbstractā€

Abstract Contrast and linewidth, which depend on the microwave (MW) and light powers, are critical for optimizing magnetometer sensitivity based on high-density nitrogen vacancy (NV) centers in diamond. Therefore, the tradeoff between laser and MW powers can be adjusted to optimize the contrast and linewidth extracted from the magnetic resonance. In this paper, we developed a pulsed electron spin resonance (ESR) measurement to enhance the magnetic field sensitivity of an NV magnetic sensor with high-density NV centers in diamond by narrowing the linewidth while keeping the contrast almost constant. Furthermore, for a wide range of experimental settings of MW and light powers in the continuous-wave (CW) method, the contrast and linewidth always increase with increasing MW power. However, by using a simple pulsed ESR sequence based on the repetitive excitation of NV centers, linewidth broadening under relatively high MW power is avoided. The magnetic field sensitivity reaches less than <mml:math xmlns:mml=ā€œhttp://www.w3.org/1998/Math/MathMLā€ overflow=ā€œscrollā€> <mml:mn mathvariant=ā€œnormalā€>250</mml:mn> <mml:mspace width=ā€œ.25emā€/> <mml:mi mathvariant=ā€œnormalā€>pT</mml:mi> <mml:mo>/</mml:mo> <mml:msqrt> <mml:mrow> <mml:mi mathvariant=ā€œnormalā€>Hz</mml:mi> </mml:mrow> </mml:msqrt> </mml:math> by eliminating the power broadening of the linewidth of ESR, which is one third of that achieved using CW measurements. Finally, the possibility of enhancing magnetic-field sensitivity utilizing the light-narrowing effect is discussed.

Tech Support

Section titled ā€œTech Supportā€

Original Source

Section titled ā€œOriginal Sourceā€

References

Section titled ā€œReferencesā€
  1. 2014 - Magnetometry with nitrogen-vacancy defects in diamond [Crossref]
  2. 2013 - Nanometre-scale thermometry in a living cell [Crossref]
  3. 2010 - Temperature dependence of the nitrogen-vacancy magnetic resonance in diamond [Crossref]
  4. 2014 - Dynamic strain-mediated coupling of a single diamond spin to a mechanical resonator [Crossref]
  5. 2011 - Electric-field sensing using single diamond spins [Crossref]
  6. 2012 - Measurable quantum geometric phase from a rotating single spin [Crossref]
  7. 2019 - Efficient microwave radiation using broaden bandwidth coplanar waveguide resonator on assembly of nitrogen-vacancy centers in diamond [Crossref]
  8. 2008 - Scanning magnetic field microscope with a diamond single-spin sensor [Crossref]
  9. 2008 - High-sensitivity diamond magnetometer with nanoscale resolution [Crossref]
  10. 2009 - Ultralong spin coherence time in isotopically engineered diamond [Crossref]

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