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Device creates negative mass—and a novel way to generate lasers
engineering
Persuade, Change, Influence
User ID: kaput
01-14-2018 05:31 AM

Posts: 1,524



Post: #1
Device creates negative mass—and a novel way to generate lasers
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Device creates negative mass—and a novel way to generate lasers

Most objects react in predictable ways when force is applied to them—unless they have "negative mass." And then they react exactly opposite from what you would expect.

Now University of Rochester researchers have succeeded in creating particles with negative mass in an atomically thin semiconductor, by causing it to interact with confined light in an optical microcavity.

This alone is "interesting and exciting from a physics perspective," says Nick Vamivakas, an associate professor of quantum optics and quantum physics at Rochester's Institute of Optics. "But it also turns out the device we've created presents a way to generate laser light with an incrementally small amount of power."

The device, described in Nature Physics, consists of two mirrors that create an optical microcavity, which confines light at different colors of the spectrum depending on how the mirrors are spaced.

Researchers in Vamivakas' lab, including co-lead authors Sajal Dhara (now with the Indian Institute of Technology) and Ph.D. student Chitraleema Chakraborty, embedded an atomically thin molybdenum diselenide semiconductor in the microcavity.

The semiconductor was placed in such a way that its interaction with the confined light resulted in small particles from the semiconductor—called excitons—combining with photons from the confined light to form polaritons.

"By causing an exciton to give up some of its identity to a photon to create a polariton, we end up with an object that has a negative mass associated with it," Vamivakas explains. "That's kind of a mind-bending thing to think about, because if you try to push or pull it, it will go in the opposite direction from what your intuition would tell you."

Other research groups have been experimenting with similar devices, Vamivakas says, but this is the first device to produce particles with negative mass.

Though applications are "still down the road," Vamivakas adds, his lab will continue to explore:

*How the device might serve as a substrate for producing lasers. "With the polaritons we've created with this device, the prescription for getting a laser to operate is completely different," Vamivakas says. "The system starts lasing at a much lower energy input" than traditional lasers now in use.

*The physical implications of creating negative mass in the device. "We're dreaming up ways to apply pushes and pulls—maybe by applying an electrical field across the device—and then studying how these polaritons move around in the device under application of external force."

Read more at: https://phys.org/news/2018-01-device-neg...s.html#jCp
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freepatriot
Registered User
User ID: 1337
01-14-2018 06:39 AM

Posts: 92



Post: #2
RE: Device creates negative mass—and a novel way to generate lasers
Would be great in military lasers.
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LoP Guest
lop guest
User ID: 1337
01-14-2018 06:52 AM

 



Post: #3
RE: Device creates negative mass—and a novel way to generate lasers
Negative mass is such a drag. I mean, cheer up already! And stop blowing sh*t up.
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Dr. Woo

User ID: 53145
01-14-2018 07:21 AM

Posts: 522



Post: #4
RE: Device creates negative mass—and a novel way to generate lasers
This will be classified in the interest of state security and disappear into the defense black budget hole
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LoP Guest
lop guest
User ID: 1337
01-14-2018 07:26 AM

 



Post: #5
RE: Device creates negative mass—and a novel way to generate lasers
negative mass, chuckle

like black whole.
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LoP Guest
lop guest
User ID: 1337
01-14-2018 07:30 AM

 



Post: #6
RE: Device creates negative mass—and a novel way to generate lasers
engineering  Wrote: (01-14-2018 05:31 AM)
Device creates negative mass—and a novel way to generate lasers

Most objects react in predictable ways when force is applied to them—unless they have "negative mass." And then they react exactly opposite from what you would expect.

Now University of Rochester researchers have succeeded in creating particles with negative mass in an atomically thin semiconductor, by causing it to interact with confined light in an optical microcavity.

This alone is "interesting and exciting from a physics perspective," says Nick Vamivakas, an associate professor of quantum optics and quantum physics at Rochester's Institute of Optics. "But it also turns out the device we've created presents a way to generate laser light with an incrementally small amount of power."

The device, described in Nature Physics, consists of two mirrors that create an optical microcavity, which confines light at different colors of the spectrum depending on how the mirrors are spaced.

Researchers in Vamivakas' lab, including co-lead authors Sajal Dhara (now with the Indian Institute of Technology) and Ph.D. student Chitraleema Chakraborty, embedded an atomically thin molybdenum diselenide semiconductor in the microcavity.

The semiconductor was placed in such a way that its interaction with the confined light resulted in small particles from the semiconductor—called excitons—combining with photons from the confined light to form polaritons.

"By causing an exciton to give up some of its identity to a photon to create a polariton, we end up with an object that has a negative mass associated with it," Vamivakas explains. "That's kind of a mind-bending thing to think about, because if you try to push or pull it, it will go in the opposite direction from what your intuition would tell you."

Other research groups have been experimenting with similar devices, Vamivakas says, but this is the first device to produce particles with negative mass.

Though applications are "still down the road," Vamivakas adds, his lab will continue to explore:

*How the device might serve as a substrate for producing lasers. "With the polaritons we've created with this device, the prescription for getting a laser to operate is completely different," Vamivakas says. "The system starts lasing at a much lower energy input" than traditional lasers now in use.

*The physical implications of creating negative mass in the device. "We're dreaming up ways to apply pushes and pulls—maybe by applying an electrical field across the device—and then studying how these polaritons move around in the device under application of external force."

Read more at: https://phys.org/news/2018-01-device-neg...s.html#jCp

So people are starting to understand the opposite of opposite equals.

Will they call it newtons 3.5 and give him the nobel death prize posthumously?

The law of the 3 is a bit*h, chuckle
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LoP Guest
lop guest
User ID: 1337
01-14-2018 07:31 AM

 



Post: #7
RE: Device creates negative mass—and a novel way to generate lasers
sell your Jenny Craig stock
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LoP Guest
lop guest
User ID: 1337
01-14-2018 07:34 AM

 



Post: #8
RE: Device creates negative mass—and a novel way to generate lasers
more than likely the concept of negative mass is bullshit.
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