First Black Hole For Light Created On Earth 244
An anonymous reader writes "An electromagnetic 'black hole' that sucks in surrounding light has been built for the first time. The device, which works at microwave frequencies, may soon be extended to trap visible light, leading to an entirely new way of harvesting solar energy to generate electricity. A theoretical design for a table-top black hole to trap light was proposed in a paper published earlier this year by Evgenii Narimanov and Alexander Kildishev of Purdue University in West Lafayette, Indiana. Their idea was to mimic the properties of a cosmological black hole, whose intense gravity bends the surrounding space-time, causing any nearby matter or radiation to follow the warped space-time and spiral inwards."
It's an interesting development.... (Score:5, Interesting)
But I have definite issues with the last paragraph of the article
The article gives no indication that light passing near the device will get sucked into it, but only that all light hitting the device gets sucked into the center. So instead of requiring those huge parabolic mirrors, you'll instead require these huge cylindrical structures. Would still have a nice advantage in that no tracking or steering devices would be required since light hitting it from any side gets "sucked in", but it would still require a considerable amount of real estate to deploy assuming that they can both scale it down (to handle visible light) and scale it up (to make the amount of light absorbed represent a non-trivial amount of power).
plants (Score:1, Interesting)
The interesting thing to me is that the molecule plants use for photosynthesis has some spiral-like structures. Those could be guiding visible light in the same way.
Not that that helps solar power's number one problem, which is energy storage.
I am curious (Score:2, Interesting)
Re:uhhh... how much energy does it take? (Score:3, Interesting)
I doubt it would be cheaper to make, but a mirror reflects light from one direction and if you have concave shape focuses that light at a certain point, but for that to work the light has to be entering from the right direction relative to the focus point (normal straight in the front but doesn't necessarily have to be
This system would work regardless of which direction the light enters from, which means it works under very difuse light source. It also means you don't need a tracking system to keep the mirror at the right angle relative to the sun which would make installation and maintenance costs lower than a tracking mirror system.
Re:First priority. (Score:3, Interesting)
Simply call it "Electromagnetic Sponge"
Re:First priority. (Score:3, Interesting)
First priority: Install one above every street light so we can get our lovely speckled black skies back. :)
Military Application? (Score:3, Interesting)
Are we looking at the next generation of stealth technology?
Re:wrong canon (Score:3, Interesting)
I believe elrous0 was referring to the timeline of The Hitchhiker's Guide to the Galaxy, wherein all the dolphins leave Earth just before the Vogons destroy it.
Re:It's an interesting development.... (Score:1, Interesting)