公开(公告)号：US20220082639A1

公开(公告)日：2022-03-17

申请号：US17376234

申请日：2021-07-15

Applicant: Massachusetts Institute of Technology

Inventor： Laura KIM ,  Hyeongrak CHOI ,  Matthew Edwin TRUSHEIM ,  Dirk Robert ENGLUND

IPC: G01R33/032 ,  G01R29/08

Abstract: Nitrogen vacancy (NV) centers in diamond combine exceptional sensitivity with nanoscale spatial resolution by optically detected magnetic resonance (ODMR). Infrared (IR)-absorption-based readout of the NV singlet state transition can increase ODMR contrast and collection efficiency. Here, a resonant diamond metallodielectric metasurface amplifies IR absorption by concentrating the optical field near the diamond surface. This plasmonic quantum sensing metasurface (PQSM) supports plasmonic surface lattice resonances and balances field localization and sensing volume to optimize spin readout sensitivity. Combined electromagnetic and rate-equation modeling suggests a near-spin-projection-noise-limited sensitivity below 1 nT Hz−1/2 per m2 of sensing area using numbers for contemporary NV diamond samples and fabrication techniques. The PQSM enables microscopic ODMR sensing with IR readout near the spin-projection-noise-limited sensitivity, making it appealing for imaging through scattering tissues and spatially resolved chemical NMR detection.

公开(公告)号：US20230208628A1

公开(公告)日：2023-06-29

申请号：US18146085

申请日：2022-12-23

Applicant: Massachusetts Institute of Technology

Inventor： Stefan Ivanov Krastanov ,  Hamza Raniwala ,  Hanfeng WANG ,  Matthew Edwin TRUSHEIM ,  Laura KIM ,  Dirk Robert ENGLUND

IPC: H04L9/08 ,  H04B10/70

CPC classification number: H04L9/0855 ,  H04B10/70

Abstract: A 1D diamond nanobeam can act as a coherent mechanical interface between spin defect centers in diamond and telecom optical modes. The nanobeam includes embedded mechanical and electric field concentrators with mechanical and optical mode volumes of Vmech/Λp3 ˜10−5 and Vopt/λ3 ˜10−3, respectively. With a Group IV vacancy in the concentrator, the nanobeam can operate at spin-mechanical coupling rates approaching 40 MHz with high acousto-optical couplings. This nanobeam, used in an entanglement heralding scheme, can provide high-fidelity Bell pairs between quantum repeaters. Using the mechanical interface as an intermediary between the optical and spin subsystems enables addressing the spin defect center with telecom optics, bypassing the native wavelength of the spin. As the spin is never optically excited or addressed, the device can operate at temperatures up to 40 K with no appreciable spectral diffusion, limited by thermal losses. Optomechanical devices with high spin-mechanical coupling can be useful for quantum repeaters.