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Page from Glasgow university with basic info on optical tweezers, including details of the iPad app the team developed. Also has some videos of particles being manipulated by optical tweezers.
A handy guide to optical tweezers, explaining how they work and some good examples of their applications.
Did you ever imagine that you can use light to move a microscopic plastic bead? Use the optical tweezers to manipulate a single strand of DNA and explore the physics of tiny molecular motors.
A fairly detailed explanation of optical tweezers and how they work.
An explanation of how optical tweezers work, and how to set up and calibrate your own. A quite detailed but clear introduction to this use of lasers.