Optical tweezers: a light touch
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Updated: May 19, 2026

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Stretching Short Sequences of DNA with Constant Force Axial Optical Tweezers
Published on: October 13, 2011
Michael P Lee1, Miles J Padgett
1School of Physics and Astronomy, SUPA, University of Glasgow, United Kingdom.
Journal of Microscopy
|August 18, 2012
Abstract:
Optical tweezers use focused laser light to manipulate microscopic particles. We discuss the underlying physics of the technique in terms of a gradient force exerted by the light on the particles. The versatility of optical tweezers is highlighted, in particular, we explain how spatial light modulators and various imaging methods have greatly enhanced their range of applications.

