Impedance-Tuned Microwave Loop for Fast, Homogeneous Rabi Oscillations of a Dense Ensemble of NV-Diamond Electronic Spins.
basic_science · Level V
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- Record sourced from PubMed, PMID 41099541.
- Also identified by DOI 10.1021/acs.nanolett.5c03811.
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Abstract
Obtaining a high Rabi oscillation frequency homogeneously across a spatially extended population of nitrogen-vacancy (NV) center electronic spins in diamond is useful for efficient spin-state manipulation of the NV ensemble and in using NVs to detect ensembles of other spin species. Here, we achieve a high, homogeneous Rabi frequency for a dense NV ensemble by enhancing the microwave magnetic fields in the center region of a diamond-coupled planar metallic loop via systematic engineering that increases the microwave current driving of the loop, while avoiding off-center proximity to the loop that gives strong but inhomogeneous microwave fields. With such enhanced microwave fields at 2.55 GHz, we achieve a 136.3 MHz NV Rabi frequency with 1.5% inhomogeneity over a 40 μm × 40 μm diamond area, and we use the NV ensemble to detect a ∼30-MHz magnetic signal, similar to a nuclear magnetic resonance (NMR) signal at a tesla-scale bias magnetic field, with Hz-scale spectral resolution.