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Laser
tweezers go nano
Lasers have been used to trap and move microscopic objects including individual cells for years. The new channel technique -- sub-wavelengths slot waveguides -- extends laser tweezers to the nanoscale.
Researchers used a prototype to manipulate individual unadulterated DNA molecules in a biochip.
The technique could be used to study biological molecules and eventually build nanomachines.
Research paper:
Optical Manipulation of Nanoparticles and Biomolecules in Sub-wavelength Slot Waveguides
Nature, January 1, 2009
Researchers' homepages:
Allen H. J. Yang
Michal Lipson
David Erickson
Related stories and briefs:
Laser tweezer traps nanotubes -- related research
Back to TRN January 5/12, 2009
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