Article Title

Electron spin resonance of nitrogen-vacancy centers in optically trapped nanodiamonds

Type of Work

Article

Date

8-21-2012

Journal Title

Proceedings of the National Academy of Sciences

Journal Title - Alternate

PNAS

Journal ISSN

1091-6490

Journal Volume

109

Journal Issue

34

First Page

13493

Last Page

13497

DOI

10.1073/pnas.1211311109

Abstract

Using an optical tweezers apparatus, we demonstrate three-dimensional control of nanodiamonds in solution with simultaneous readout of ground-state electron-spin resonance (ESR) transitions in an ensemble of diamond nitrogen-vacancy (NV) color centers. Despite the motion and random orientation of NV 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 d.c. magnetometry in solution. We estimate the d.c. magnetic field sensitivity based on variations in ESR line shapes to be ~50 microTesla/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.

Hamilton Areas of Study

Physics

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