The future’s here, someone tell Starfleet. Scientists from Fudan University in Shanghai have developed a plan to make a tractor beam that is capable of moving molecules using only light. The device hasn’t been produced, but an NYU scientist is convinced that it can work. The physicist, David Grier, built the first ever working tractor beam last year, based on a similar design.
According to this article on ScienceNews, the theoretical machine developed by the Chinese scientists would focus a beam of light on an object, creating electromagnetic fields on it. The light scattered by these fields would push the object towards the beam, instead of away from it like in a traditional laser. Physicist Jun Chen at Fudan University said that this type of beam would work as a way to draw in particles using only light.
Grier’s beam, demonstrated in a paper published about a year ago, showed how light could be used to pull objects instead of push them in a lab. He wasn’t exactly using it to rearrange his furniture though; the device moved a 1.5 micrometer sphere about 8 micrometers. With that in mind, Grier said a similar type of beam could be used to pull a person, but it would have to carry about a terrawatt of power. Definitely not a safe amount of energy, as he was quoted saying “it would be a short trip.” Yikes.
Just knowing that something like this exist brings us that much closer to feeling like we’re living in a sci-fi movie. We may not have flying cars, but tractor beams? No problem.
[via ScienceNews]