Scientists discover new form of light.
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Researchers recently discovered a beam of light with photons traveling with an angular momentum never before measured.
Researchers in Ireland have discovered a new form of light. Their discovery is expected to reshape scientists' understanding of light's basic nature.
Angular momentum describes the rotation of a light beam around its axis. Until now, researchers believed the angular momentum was always a multiple of Planck's constant -- a constant ratio that describes the relationship between photon energy and frequency, and also sets the scale for quantum mechanics.
The newly discovered form of light, however, features photons with an angular momentum of just half the value of Planck's constant. The difference sounds small, but researchers say the significance of the discovery is great.
"For a beam of light, although traveling in a straight line it can also be rotating around its own axis," John Donegan, a professor at Trinity College Dublin's School of Physics, explained in a news release. "So when light from the mirror hits your eye in the morning, every photon twists your eye a little, one way or another."
"Our discovery will have real impacts for the study of light waves in areas such as secure optical communications," Donegan added.
Researchers made their discovery after passing light through special crystals to create a light beam with a hollow, screw-like structure. Using quantum mechanics, the physicists theorized that the beam's twisting photons were being slowed to a half-integer of Planck's constant.
The team of researchers then designed a device to measure the beam's angular momentum as it passed through the crystal. As they had predicted, they registered a shift in the flow of photons caused by quantum effects.
The researchers described their discovery in a paper published this week in the journal Science Advances.
"What I think is so exciting about this result is that even this fundamental property of light, that physicists have always thought was fixed, can be changed," concluded Paul Eastham, assistant professor of physics at Trinity.
http://www.upi.com/Science_News/2016/05/17/Scientists-discover-new-form-of-light/9061463490086/
After solid light they just keep coming upt with weird new stuff!!
On a late summer afternoon it can seem like sunlight has turned to honey, but could liquid—or even solid—light be more than a piece of poetry? Princeton University electrical engineers say not only is it possible, they've already made it happen.
In Physical Review X, the researchers reveal that they have locked individual photons together so that they become like a solid object.
"It's something that we have never seen before," says Dr. Andrew Houck, an associate professor of electrical engineering and one of the researchers. "This is a new behavior for light."
http://www.iflscience.com/physics/crystallized-light-reveals-potential
One wonders will it ever stop. There seems to be new discoveries being made in Physics, now with Cern and other modern technologies , & before we know it.. there is a whole set of new things that we have to then consider..
Something to ponder on with ref to what you have indicated in your comment...
QuoteAfter solid light they just keep coming upt with weird new stuff!!
On a late summer afternoon it can seem like sunlight has turned to honey, but could liquid—or even solid—light be more than a piece of poetry? Princeton University electrical engineers say not only is it possible, they've already made it happen.