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Submission + - MIT's mini tractor beam

An anonymous reader writes: MIT scientists have developed a way to use light to grab and move minuscule particles on a microchip. The research could lead to fine-grained biological sensors and other precisely built nanoscale devices. Optical tweezers have been used on transparent media — like a microscope slide — that let the light shine through and hold objects in a tractor beam-like embrace. (This is possible because light's individual photons transfer minuscule amounts of force to particles they hit.) What's new in the optical tweezer from MIT's Matt Lang and David Appleyard is the use of infrared light. Unlike visible light, the infrared does not bounce off the silicon used as the basis for microchips. That means that MIT's optical tweezer can be used not just for study but to build structures on the surface of chips. Lang and Appleyard proved their technique by getting 16 live E. coli cells to spell out "MIT" on a chip.

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