Absorption-Based Diamond Spin Microscopy on a PlasmonicnQuantum Metasurface
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2021-11-04 |
| Journal | OPAL (Open@LaTrobe) (La Trobe University) |
| Authors | Laura Kim, Hyeongrak Choi, Matthew E. Trusheim, Dirk Englund |
| Institutions | Cambridge Electronics (United States) |
Abstract
Section titled āAbstractāNitrogen\nvacancy (NV) centers in diamond have emerged as a leading\nquantum sensor platform, combining exceptional sensitivity with nanoscale\nspatial resolution by optically detected magnetic resonance (ODMR).\nBecause fluorescence-based ODMR techniques are limited by low photon\ncollection efficiency and modulation contrast, there has been growing\ninterest in infrared (IR)-absorption-based readout of the NV singlet\nstate transition. IR readout can improve contrast and collection efficiency,\nbut it has thus far been limited to long-path length geometries in\nbulk samples due to the small absorption cross section of the NV singlet\nstate. Here, we propose to amplify the IR absorption by introducing\na resonant diamond metallodielectric metasurface that concentrates\nthe optical field near the diamond surface. This āplasmonic\nquantum sensing metasurfaceā (PQSM) supports plasmonic surface\nlattice resonances and achieves desired balance between field localization\nand sensing volume to optimize spin readout sensitivity. From combined\nelectromagnetic and rate-equation modeling, we estimate a near-spin-projection-noise-limited\nsensitivity below 1 nT Hz<sup>-1/2</sup> per Ī¼m<sup>2</sup> of sensing area using numbers for present-day NV diamond samples\nand fabrication techniques. The proposed PQSM enables a new form of\nmicroscopic ODMR sensing with infrared readout near the spin-projection-noise-limited\nsensitivity, making it appealing for the most demanding applications\nsuch as imaging through scattering tissues and spatially resolved\nchemical NMR detection.