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Trek-like tractor beam is possible

Trek-like tractor beam is possible

作者:西门煦奖  时间:2019-03-07 11:19:00  人气:

IN SCIENCE fiction it’s common for spacecraft to reel in objects using a glowing tractor beam. Now there’s a way to do this in real life – at least for very small particles. When light falls on an opaque object, the surface reflects most of the photons back in the direction they came from. What’s less obvious is that these bouncing photons push back on the object, causing it to move away from the light source. Now Jun Chen of Fudan University in Shanghai, China,