About the cover

March 2013 Volume 8 No 3

Nitrogen-vacancy (NV) centres in diamond have the potential to act as qubits for quantum information as well as ultrasensitive probes of both magnetic and electric fields. To fully exploit the capabilities of NV centres, techniques to manipulate them with nanometere accuracy are required. The Letter by Geiselmann et al. describes how optical tweezers are used to achieve both translational and angular control of single NV centres in solution. The cover image is an artist’s view of one of the experiments that was performed in which a single NV was trapped at the focus of a near-infrared laser beam and was raster scanned to map the distribution of the optical modes around an ensemble of gold nanoislands. Because the technique may be used in a biological environment, it could open new possibilities for the use of colour centres for spin-based cell interrogation.

Letter p175

IMAGE: MATHIEU L. JUAN AND ROMAIN QUIDANT

COVER DESIGN: ALEX WING