Laura Kim1,Hyeongrak Choi1,Matthew Trusheim1,2,Dirk Englund1
Massachusetts Institute of Technology1,U.S. Army Research Laboratory2
Laura Kim1,Hyeongrak Choi1,Matthew Trusheim1,2,Dirk Englund1
Massachusetts Institute of Technology1,U.S. Army Research Laboratory2
Nitrogen vacancy (NV) centers in diamond have emerged as a leading platform for solid-state quantum sensors with coherent times exceeding one second even at room temperature. The ability to optically measure quantities such as electric field, magnetic field, and temperature makes the NV system appealing for a wide range of applications ranging from biomedical devices to geology and navigation devices. A particular area of focus has been on quantum microscopy for wide-field imaging applications, which take advantage of the atomic length scale of the diamond color center. The central challenge remains in maximizing optical signal from the near-surface color centers and optimizing sensitivity per area. We report a quantum sensing metasurface consisting of periodic arrays of plasmonic nanostructures that support plasmonic surface lattice resonances. The metasurface is optimized to readily couple with external radiation and concentrate the optical field within a micron-scale NV layer mediating efficient spin-photon interactions. This plasmonic quantum sensing metasurface (PQSM) achieves shot-noise-limited sensing with a standard camera, eliminating the need of single-photon detectors, and boosts sensitivity via several ways: probing the infrared singlet transition with absorption rather than fluorescence for efficient collection, using homodyne measurements to achieve unity contrast, and scaling to large imaging surfaces. By combining these aspects, our theoretical calculations predict sub-nT Hz<sup>-1/2</sup> sensitivity per 1-μm<sup>2</sup> sensing area [1]. In this presentation, our recent progress on an experimental demonstration of resonant quantum sensing metasurfaces will be discussed. The projected performance makes the studied PQSM appealing for the most demanding applications such as imaging through scattering tissues and spatially resolved chemical NMR detection.<br/><br/>Reference:<br/>[1] L. Kim, H. Choi, M. E. Trusheim, and D. R. Englund, “Diamond Spin Microscopy on a Plasmonic Quantum Metasurface,” To appear in <i>ACS Photonics</i> (2021).