Nanotechnology: Photons make light work

Journal name:
Nature
Volume:
466,
Page:
162
Date published:
DOI:
doi:10.1038/466162b
Published online

Cited research: Nature Nanotechnol. doi:10.1038/nnano.2010.128 (2010)

Light particles carry momentum but, individually, not enough to move a physical object. Now Xiang Zhang and his colleagues at the University of California, Berkeley, have found a way of putting light to work. The team designed a nanometre-scale gold 'motor' with a physical structure that maximizes the strength of its interaction with light at specific wavelengths.

The light acted like a person pushing a swing, making the motor spin. The torque generated was strong enough to visibly rotate a micrometre-sized square silica disc (pictured) attached to the motor. The researchers say that the motor could eventually be used as the basis for tiny wireless devices. G.B.

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