Transfer of atomic mass with a photon solves the momentum paradox of light

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Transfer of atomic mass with a photon solves the momentum paradox of light

Post by Cr6 on Sun Aug 19, 2018 3:34 am

Transfer of atomic mass with a photon solves the momentum paradox of light
June 30, 2017, Aalto University

Transfer of atomic mass with a photon solves the momentum paradox of light

The optical force on atoms forms a mass density wave that propagates with light through the crystal. Credit: Jyrki Hokkanen, CSC

In a recent publication, Aalto University researchers show that in a transparent medium each photon is accompanied by an atomic mass density wave. The optical force of the photon sets the medium atoms in motion and makes them carry 92% of the total momentum of light, in the case of silicon.

The novel discovery solves the centennial momentum paradox of light. In the literature, there has existed two different values for the momentum of light in the transparent medium. Typically, these values differ by a factor of ten and this discrepancy is known as the momentum paradox of light. The difference between the momentum values is caused by neglecting the momentum of atoms moving with the light pulse.

To solve the momentum paradox the authors prove that the special theory of relativity requires an extra atomic density to travel with the photon. In related classical computer simulations, they use optical force field and Newton´s second law to show that a wave of increased atomic mass density is propagating through the medium with the light pulse.

The mass transfer leads to splitting of the total momentum of light into two components. The fields' share of momentum is equal to the Abraham momentum while the total momentum, which includes also the momentum of atoms driven forward by the optical force, is equal to the Minkowski momentum.

(more a link:  https://phys.org/news/2017-06-atomic-mass-photon-momentum-paradox.html  )
https://phys.org/news/2017-10-optical-chaos-momentum.html

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Public Release: 19-Oct-2017
Using optical chaos to control the momentum of light

Researchers demonstrate new method to control light in a photonic circuit

Harvard John A. Paulson School of Engineering and Applied Sciences

Integrated photonic circuits, which rely on light rather than electrons to move information, promise to revolutionize communications, sensing and data processing. But controlling and moving light poses serious challenges. One major hurdle is that light travels at different speeds and in different phases in different components of an integrated circuit. For light to couple between optical components, it needs to be moving at the same momentum.

Now, a team of researchers at the Harvard John A. Paulson School of Engineering and Applied Sciences, in collaboration with Peking University in Beijing, has demonstrated a new way to control the momentum of broadband light in a widely-used optical component known as a whispering gallery microcavity (WGM).

The paper, whose co-authors also include researchers from Washington University in Saint Louis, the California Institute of Technology, and the University of Magdeburg, is published in Science.

"The broadband optical chaos in microcavity is creating a universal tool to access many optical states," said Linbo Shao, a graduate student in the lab of Marko Loncar, the Tiantsai Lin Professor of Electrical Engineering, at SEAS and co-first author of the paper. "Previously, researchers need multiple special optical elements to couple light in and out WGMs at different wavelengths, but by this work we can couple all color lights with a single optical coupler."

A WGM is a type of optical microresonator used in a wide variety of applications, from long-range transmission in optical fibers to quantum computing. WGMs are named for the whispering galleries of St. Paul's Cathedral in London, where an acoustic wave (a whisper) circulates inside a cavity (the dome) from a speaker on one side to a listener on the other. The similar phenomena occurs in the Echo Wall in the Temple of Heaven in China and in the whispering arch in Grand Central Station in New York City.

Optical whispering galleries work much the same way. Light waves trapped in a highly-confined, circular space -- smaller than a strand of hair -- orbit around the inside of the cavity. Like the whispering wall, the cavity traps and carries the wave.

However, it is difficult to couple the optical fields from waveguides to the optical fields in whispering galleries in photonic circuits because the waves are traveling at different speeds.

Think of a WGM as a highway roundabout and optical fields as UPS trucks. Now, imagine trying to transfer a package between two trucks while both are moving at different speeds. Impossible, right?

In order to solve for this difference of momentum -- without breaking Newton's law of the conservation of momentum -- the research team created a little chaos. By deforming the shape of the optical microresonator, the researchers were able to create and harness so-called chaotic channels, in which the angular momentum of light is not conserved and can change over time. By alternating the shape of the resonator, the momentum can be tuned; the resonator can be designed to match momentum between waveguides and WGMs. Importantly, the coupling is broadband and occurs between optical states that would otherwise not couple.

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Re: Transfer of atomic mass with a photon solves the momentum paradox of light

Post by LongtimeAirman on Sun Aug 19, 2018 9:45 pm

.
Thanks Cr6, optical developments usually contain plenty of charge field miss-observations.

In the first, researchers study the propagation of a light pulses through a crystal. The pulses of visual light frequencies cause the propagation by mass density waves. Sure, that sounds reasonable enough, according to my understanding of the charge field; over time – even a very small one, a visual frequency charge source will quickly resonate or quantize the atoms and molecules of a media (which could be crystal, air or ionic), to a corresponding higher, visual energy level. The original equilibrium would just as quickly be restored when the visual light is removed. I doubt the researchers are looking at individual photons; I believe they are looking at quantization/energy changes between the medium in the two resonant states.

But then they throw in something new.
To solve the momentum paradox the authors prove that the special theory of relativity requires an extra atomic density to travel with the photon.
We know that the photon is traveling with a great deal of additional energy – due to its spin.

And the second article. Whispering gallery microcavities (OWGs) are said to be widely used optical devices in which trapped light waves are comparable to UPS trucks exchanging packages in highway roundabouts. This is accomplished by creating resonant chaos channels.

At one time I used to study this stuff, now it’s become painful, embarrassing and/or difficult. If only they knew about the charge field.
.

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Re: Transfer of atomic mass with a photon solves the momentum paradox of light

Post by Cr6 on Mon Aug 20, 2018 1:50 am

LTAM wrote:We know that the photon is traveling with a great deal of additional energy – due to its spin.

And the second article. Whispering gallery microcavities (OWGs) are said to be widely used optical devices in which trapped light waves are comparable to UPS trucks exchanging packages in highway roundabouts. This is accomplished by creating resonant chaos channels.

Thanks LTAM. That's what I had in mind too when reading this. There is energy (as you mention spin) in a photon's travel not fully accounted for.

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Re: Transfer of atomic mass with a photon solves the momentum paradox of light

Post by Jared Magneson on Sat Aug 25, 2018 8:18 pm

It's crazy but all these new articles are just further proof of the charge field - granted, I have a great deal of bias. But it explains them much quicker, cleaner, and more readily than these silly "scientists" fumbling around in the dark minus the other most important field in the universe! It is embarrassing.

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