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Lasers To Create Tractor Beams?

Posted By Mike on March 5, 2011

BBC News reports on new possibilities for real-life tractor beams stemming from research conducted by scientists in China and Hong Kong...


"It is known that light can provide a "push", for example in solar sails that propel spacecraft on a "wind of light".

Now, in a paper on the Arxiv server, researchers from Hong Kong and China have calculated the conditions required to create a laser-based "pull".

Rather than a science fiction-style weapon, however, the approach would only work over small distances.

The effect is different from that employed in "optical tweezers" approaches, in which tiny objects can be trapped in the focus of a laser beam and moved around; this new force, the authors propose, would be one continuous pull toward the source.

And it relies on directly impinging on an object, making it distinct from an approach demonstrated in 2010 by Australian researchers whose trapping worked by heating air around a trapped particle.

The trick is not to use a standard laser beam, but rather one known as a Bessel beam, that has a precise pattern of peaks and troughs in its intensity."



Click here for the full read.

Thanks to our friend Som for the heads up!


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[Latest News - News Archives]
Rebelscum Breast Cancer Awareness Charity Patch
Posted By Philip on November 25, 2014:
Thanks to everybody that ordered patches. I sent a check for $1,600.00 to the National Breast Cancer Foundation on Monday. While it's not as much as I hoped for, it's still very much appreciated. They will remain for sale in the store for anybody that still wishes to purchase them. Details after the jump.



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