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Materials Science at Oregon State University

Holographic Optical Tweezers

Date: Thursday, May 5th
Presenter: Prof. David McIntyre, OSU Physics


A strongly focused laser beam exerts a force on a particle that attracts the particle toward the focus where the intensity is largest. This technique has been dubbed optical tweezers because it permits control over the position and orientation of the trapped particle. We have recently implemented holographic optical tweezers, which employs a liquid crystal spatial light modulator to imprint a hologram onto the laser beam that allows for more complex trapping geometries. I will describe three experiments utilizing the holographic optical tweezers to trap multiple particles and perform in situ multiplexed spectroscopy, to trap microbubbles, and to probe the micromechanics of collagen fiber networks.