Modified Split Ring Resonators for Efficient and Homogeneous Microwave Control of Large Volume Spin Ensembles

Yachel Ben-Shalom, Amir Hen, Nir Bar-Gill

Research output: Contribution to journalArticlepeer-review


Quantum sensing using local defects in solid-state systems has gained significant attention over the past several years, with impressive results demonstrated both in Academia and in Industry. Specifically, employing large volume and high density ensembles for beyond state-of-the-art sensitives is of clear interest. A major obstacle for achieving such record sensitivities is associated with the need to realize strong, homogeneous driving of the sensor defects. Here we focus on high-frequency microwave sensing using nitrogen-vacancy centers in diamond, and develop a modified split-ring resonator design to address this issue. We demonstrate enhanced drive strengths and homogeneities over large volumes compared to previous results, with prospects for enabling the desired sensitivities. We reach Rabi frequencies of up to 18 [MHz] with an efficiency ratio of 2 [Gauss/ √Watt], along with an inhomogeneity of < 0.7% in a volume of 0.1 mm3. This structure also has a narrow form factor that allows for efficient optical coupling and fluorescence collection.

Original languageAmerican English
Pages (from-to)1
Number of pages1
JournalIEEE Sensors Journal
StateAccepted/In press - 2024

Bibliographical note

Publisher Copyright:


  • Diamonds
  • homogeneous control
  • Magnetic field measurement
  • Magnetic fields
  • Magnetic sensors
  • microwave
  • NV center
  • Optical sensors
  • resonator
  • Sensitivity
  • Sensors

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