Optical Tweezers
نویسندگان
چکیده
An optical tweezers apparatus uses a tightly focused laser to generate a trapping force that can capture and move small particles under a microscope. Because it can precisely and non-destructively manipulate objects such as individual cells and their internal components, the optical tweezers is extremely useful in biological physics research. In this experiment the student will use optical tweezers to trap small silica spheres immersed in water. By analyzing the dynamics of particles held in the trap, including the frequency spectrum of their Brownian motion and their response to hydrodynamic drag, the student will characterize the physical parameters of the optical trap with high precision. The apparatus can then be used to measure a microscopic biological force, such as the force that propels a swimming bacterium or the force generated by a transport motor operating inside a plant cell.
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