1 / 1

Enhanced Electron Spin Resonance of Nitrogen-Vacancy Centers in Optically Trapped Nanodiamonds

This study presents the use of optical tweezers to achieve three-dimensional manipulation of nanodiamonds while measuring ground-state electron-spin resonance (ESR) transitions in nitrogen-vacancy centers. Despite the movement and random orientation of these centers in the optical trap, distinct ESR peaks are observed, similar to bulk measurements. The research also models these spectra in an external magnetic field, estimating a dc magnetic field sensitivity of approximately 50 µT/(Hz)½. This method may enable new spin-based sensing techniques in fluidic environments and biophysical systems.

rehan
Télécharger la présentation

Enhanced Electron Spin Resonance of Nitrogen-Vacancy Centers in Optically Trapped Nanodiamonds

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Electron Spin Resonance Of Nitrogen-vacancy Centers In Optically Trapped NanodiamondsDaniel C. Ralph, Cornell University, ECCS 0335765 Using an optical tweezers apparatus, we demonstrate threedimensional control of nanodiamondsin solution with simultaneous readout of ground-state electron-spin resonance (ESR) transitions in an ensemble of diamond nitrogen vacancy color centers. Despite the motion and random orientation of nitrogen-vacancy centers suspended in the optical trap, we observe distinct peaks in the measured ESR spectra qualitatively similar to the same measurement in bulk. Accounting for the random dynamics, we model the ESR spectra observed in an externally applied magnetic field to enable dc magnetometry in solution. We estimate the dc magnetic field sensitivity based on variations in ESR line shapes to be approximately 50 μT∕ (Hz)1/2 . This technique may provide a pathway for spin-based magnetic, electric, and thermal sensing in fluidic environments and biophysical systems inaccessible to existing scanning probe techniques. (A) Schematic of experimental setup. (B) Energy level diagram of the diamond NV center. (C) Micrograph of the 50-Ω-impedance-matched antenna that drives coherent transitions between spin states. Measured IPL and contrast ΔIPL before and after turning on the trapping beam. As the trapping beam remains on, fluorescent nanodiamonds stochastically enter the trap and cause IPL to increase in discrete steps, with coincident rises in ΔIPL indicating the presence of NV centers. V. Horowitz, et.al. Awschalom Group, UCSB Work partially performed at UCSB Nanofabrication Facility Proc. Natl. Acad. Sci. USA, 109, 13493 (2012)

More Related