Optically Detected Magnetic Resonance of Nitrogen Vacancies in a Diamond Anvil Cell Using Designer Diamond Anvils*

Optically detected magnetic resonance of nitrogen vacancy centers in diamond offers novel routes to both DC and AC magnetometry in diamond anvil cells under high pressures (>3GPa). However, a serious challenge to realizing experiments has been the insertion of microwave radiation into the sample space without screening by the gasket material. We utilize designer anvils with lithographically-deposited metallic microchannels on the diamond culet as a microwave antenna. We present optically-detected magnetic resonance (ODMR) data in a diamond anvil cell up to 8 GPa, using designer anvils to insert low power microwaves into the sample space. This work is the first use of designer anvils at microwave frequencies, and thus enables us to perform ODMR without the difficulties of inserting a conducting channel either into the sample space between the anvil and the gasket, or surrounding the anvil with a coil and using high power microwaves.