Optical Tweezers

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Entry by Haifei Zhang, AP 225, Fall 2009

What is optical tweezers

Optical Tweezers use light to manipulate microscopic objects as small as a single atom. The radiation pressure from a focused laser beam is able to trap small particles. In the biological sciences, these instruments have been used to apply forces in the pN-range and to measure displacements in the nm range of objects ranging in size from 10 nm to over 100 mm.

The physics of optical tweezers

Optical-tweezer-fig1.jpg