Broadband loop gap resonator for nitrogen vacancy centers in diamond
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2018-09-01 |
| Journal | Review of Scientific Instruments |
| Authors | E. R. Eisenach, J F Barry, L. M. Pham, R.G. Rojas, D. R. Englund |
| Institutions | MIT Lincoln Laboratory, Massachusetts Institute of Technology |
| Citations | 36 |
Abstract
Section titled āAbstractāWe present an S-band tunable loop gap resonator (LGR), which provides strong, homogeneous, and directionally uniform broadband microwave (MW) drive for nitrogen-vacancy (NV) ensembles. With 42 dBm of input power, the composite device provides drive field amplitudes approaching 5 G over a circular area ā³50 mm2 or cylindrical volume ā³250 mm3. The wide 80 MHz device bandwidth allows driving all NV Zeeman resonances for bias magnetic fields below 20 G. The device realizes percent-scale MW drive inhomogeneity; we measure a fractional root-mean-square inhomogeneity Ļrms = 1.6% and a peak-to-peak variation Ļpp = 3% over a circular area of 11 mm2 and Ļrms = 3.2% and Ļpp = 10.5% over a larger 32 mm2 circular area. We demonstrate incident MW power coupling to the LGR using two methodologies: a printed circuit board-fabricated exciter antenna for deployed compact bulk sensors and an inductive coupling coil suitable for microscope-style imaging. The inductive coupling coil allows for approximately 2Ļ steradian combined optical access above and below the device, ideal for envisioned and existing NV imaging and bulk sensing applications.