Dual-frequency dielectric resonator for combined magnetic resonance of g∼2 paramagnetic species and diamond NV centers
Year: 2026
Type: article
Abstract: Nitrogen-vacancy (NV) centers in diamond are leading platforms for quantum sensing, yet efficient control of macroscopic ensembles remains challenging. While resonant structures offer high microwave-to-magnetic-field conversion factor (Cp), their narrow bandwidths typically preclude simultaneous addressing of NV transitions and co-located g~2 paramagnetic species, which are separated by ~2.87 GHz at X-band. By enabling concurrent pulsed control of NVs and bath electron spins, one can facilitate advanced applications such as spin-bath driving and NV-assisted dynamic nuclear polarization in ensemble samples. We present a compact dual-frequency dielectric resonator designed to resolve this limitation by co-exciting the TE01δ mode (~9 GHz) and the HEM12δ mode (~11.8 GHz) within a high-permittivity (ε' ~ 80) ceramic ring. This architecture concentrates magnetic fields in a shared sample volume while maintaining essential optical access and minimizing electric-field-induced heating. Experimental characterization demonstrates resonance frequencies of 8.78 GHz (Q ~237) and 11.41 GHz (Q ~ 64), with fine-tuning capabilities. Electron spin resonance (ESR) measurements on P1-rich diamond yielded B1 conversion factors of Cp ~ 2.35 and ~0.29 G /√𝑊 for the respective modes. Validation via optically detected magnetic resonance (ODMR) confirmed high-fidelity Rabi oscillations with π-pulse durations of ~ 24 ns, using a peak microwave power of 63 W.
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,790
Awards: G2057248667, G2808532880, G7227202625
OpenAlex ID: W7160707709