Tunable and Broadband Loop Gap Resonator for Nitrogen Vacancy Centers in Diamond
Massachusetts Institute of Technology Cambridge United States
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In this thesis, the loop gap resonator LGR is presented as a mechanism for the delivery of resonantly enhanced and uniform microwave fields to large volume samples of nitrogen vacancy NV centers in diamond. Specifically, an S-band tunable LGR and its constituent excitation circuitry are designed that allow directionally uniform, strong, homogeneous, and broadband microwave MW driving of an NV ensemble over an area larger than 32 mm exp 2. Two methods of coupling to the resonator are implemented and discussed. The LGR design, based on the anode block of a cavity magnetron, demonstrates an average field amplitude of 5 gauss at 42 dBm of input power, and achieves a peak-to-peak field uniformity of 89.5 over an area of 32.2 mm exp 2 and 97 over an area of 11 mm exp 2. The broad bandwidth of the LGR is capable of addressing all resonances of an NV ensemble for bias magnetic Fields up to 14 gauss. Furthermore, with cavity ring-down-times in the single nanoseconds, the resonator is compatible with the pulsed MW techniques necessary for a wide range of NV-diamond applications.
- Electricity and Magnetism
- Electrical and Electronic Equipment
- Solid State Physics