Magnetometry via spin-mechanical coupling in levitated optomechanics
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2017-08-04 |
| Journal | Optics Express |
| Authors | Pardeep Kumar, M. Bhattacharya |
| Citations | 24 |
Abstract
Section titled āAbstractāWe analyze magnetometry using an optically levitated nanodiamond. We consider a configuration where a magnetic field gradient couples the mechanical oscillation of the diamond with its spin degree of freedom provided by a nitrogen vacancy center. First, we investigate the measurement of the position spectrum of the mechanical oscillator. We find that conditions of ultrahigh vacuum and feedback cooling allow a magnetic field gradient sensitivity of 1Ī¼Tm<sup>-1</sup>/Hz. At high pressure and room temperature, this sensitivity degrades and can attain a value of the order of 100mTm<sup>-1</sup>/Hz. Subsequently, we characterize the magnetic field gradient sensitivity obtainable by maneuvering the spin degrees of freedom using Ramsey interferometry. We find that this technique can offer photon-shot noise and spin-projection noise limited magnetic field gradient sensitivity of 100Ī¼Tm<sup>-1</sup>/Hz. We conclude that this hybrid levitated nanomechanical magnetometer provides a favorable and versatile platform for sensing applications.