Optical tweezers

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Dielectric objects are attracted to the center of the beam, slightly above the beam waist, as described in the text. The force applied on the object depends linearly on its displacement from the trap center just as with a simple spring system.

Optical tweezers (originally called "single-beam gradient force trap") are scientific instruments that use a highly focused laser beam to provide an attractive or repulsive force (typically on the order of piconewtons), depending on the refractive index mismatch to physically hold and move microscopic dielectric objects. Optical tweezers have been particularly successful in studying a variety of biological systems in recent years.

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• Related: Tweezers

Optical Tweezers, An Introduction Optical Tweezers, An Introduction www.stanford.edu/.../Optical%20Tweezers%20Introduction.htm - Web

Interactive simulation of OT Interactive simulation of OT phet.colorado.edu/.../sims.php?sim=Optical_Tweezers_and_Applications - Web

Videos Videos www.rowland.harvard.edu/labs/bacteria/index_movies.html - Web

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Videos Videos 129.215.156.68/tweezermovies/tweezermovies.htm - Web

Video Video www.youtube.com/watch?v=v97MesU3Zkw - Web

Video Video www.youtube.com/watch?v=jCdnBmQZ6_s - Web

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