Extraordinary Light

Beyond the boundaries of established science an avalanche of exotic ideas compete for our attention. Experts tell us that these ideas should not be permitted to take up the time of working scientists, and for the most part they are surely correct. But what about the gems in the rubble pile? By what ground-rules might we bring extraordinary new possibilities to light?

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seasmith
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Re: Extraordinary Light

Unread post by seasmith » Thu Oct 25, 2012 3:26 pm

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Optical Vortex Beams Emit


Image
Light in optical vortex beams does not propagate in straight rays. Rather, its energy travels spirally in a hollow conical beam shape, appearing much like a vortex or cyclone, with light rays “twisting” either left- or right-handedly. Theoretically, no limit exists to how twisted the light rays can be.
Light becomes current ?


Image


http://www.bristol.ac.uk/

kiwi
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Re: Extraordinary Light

Unread post by kiwi » Thu Oct 25, 2012 6:51 pm

Hi Seasmith ... seen this? :arrow:

http://www.youtube.com/watch?feature=pl ... _9vd4HWlVA#!
Published on Jul 26, 2012 by TEDtalksDirector
http://www.ted.com Ramesh Raskar presents femto-photography, a new type of imaging so fast it visualizes the world one trillion frames per second, so detailed it shows light itself in motion. This technology may someday be used to build cameras that can look "around" corners or see inside the body without X-rays.

seasmith
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Re: Extraordinary Light

Unread post by seasmith » Thu Oct 25, 2012 7:38 pm

kiwi,

Yeah thanks, similar. That pulse-echo laser probe is more like light becomes sound, lidar to sonar
The technology today to transmit and receive highly tuned and polished pulsations on near subatomic nano-scale is fascinating and full of promise.

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webolife
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Re: Extraordinary Light

Unread post by webolife » Sat Oct 27, 2012 3:57 pm

Despite the apparent motion provided by the processing of the data bits, at any one frame the light appears in the camera, not in the space depicted by the coke bottle. It's a great trick, and the super fast exposure processing is fabulous, but even at these allegedly "faster than light" speeds, the camera is exposing a light beam that it senses only when the light pulse is in contact with the camera, and not before. The pulse appears to travel at the c-"speed of light", yet the camera "instantaneously" records the pulse at some distance away.
Truth extends beyond the border of self-limiting science. Free discourse among opposing viewpoints draws the open-minded away from the darkness of inevitable bias and nearer to the light of universal reality.

seasmith
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Re: Extraordinary Light

Unread post by seasmith » Thu Nov 01, 2012 1:26 pm

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Light in Knots
In the system that we describe, knotting of vortices occurs spontaneously as a rotating, anisotropic soliton38, 39 propagates in a nonlinear medium. We show that as a radially perturbed soliton propagates, vortex loops40 occur in the form of rings perpendicular to the propagation direction. This spontaneous vortex nucleation is a consequence of the nonlinear phase accumulation between the soliton's peak and its tail: phase singularities nucleate if this phase difference reaches the value of π during evolution along the optical axis z, the analogue of time for a two-dimensional pancake BEC39. If the soliton is elliptic and spinning, these loops are twisted in three-dimensional space, and when the twisting parameter is large enough, the vortices reconnect41, 42 to form knots and links at the edge of the self-trapped region of the light beam. Such spontaneous knotting is absent from linear light beam propagation36, 37, and in our system, arises from the soliton's angular momentum43 and nonlinearity44.
http://www.nature.com/srep/2012/121025/ ... 00771.html

While it has been shown previously that light can be induced to tie itself in knots, for the first time researchers have caused the phenomenon to happen spontaneously, forming little cores of darkness in bright laser beams. Courtesy of Australian National University.
Attachments
optical knot
optical knot

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webolife
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Re: Extraordinary Light

Unread post by webolife » Sat Nov 03, 2012 5:25 pm

The vortical pattern, as well as the laser "beading", as I see it, is a moire pattern, not unlike the pattern of differential light intensity/exposure seen in microwave ovens, spotlight beams, and the like -- produced by the cancellation of oppositely pointing light vectors.
Truth extends beyond the border of self-limiting science. Free discourse among opposing viewpoints draws the open-minded away from the darkness of inevitable bias and nearer to the light of universal reality.

seasmith
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Re: Extraordinary Light

Unread post by seasmith » Sun Nov 04, 2012 8:02 am

and the like -- produced by the cancellation of oppositely pointing light vectors.
-webolife


I agree that the optical effects described above are similar to interference dynamics ( like Moire´), but don't think that simple 'vector' analysis reflects all that is going on in a ~light beam~.

The Faraday effect causes left and right circularly polarized waves to propagate at slightly different speeds, a property known as circular birefringence. Since a linear polarization can be decomposed into the superposition of two equal-amplitude circularly polarized components of opposite handedness and different phase, the effect of a relative phase shift, induced by the Faraday effect, is to rotate the orientation of a wave's linear polarization.
http://en.wikipedia.org/wiki/Faraday_effect

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webolife
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Re: Extraordinary Light

Unread post by webolife » Sun Nov 04, 2012 11:04 am

My brief post was definitely an oversimplification, intended to point to the geometry of the optical system being described. As in the femtophotography video, the beady laser, as well as moving "pulses" being depicted does not explain how the detector is simultaneously recording the image. In my view, as often mentioned, the direction of the laser vector is toward the laser, not an emission away from it.

Also, lest there be any further confusion, I don't regard Young-style interference [which is allegedly a moire pattern] to be the correct explanation for the spectral pattern seen through a slit or double slit apparatus.
Truth extends beyond the border of self-limiting science. Free discourse among opposing viewpoints draws the open-minded away from the darkness of inevitable bias and nearer to the light of universal reality.

seasmith
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Re: Extraordinary Light

Unread post by seasmith » Mon Nov 05, 2012 11:32 am

`
A bit more on "Vortex Beams", with pics:


http://www.tuwien.ac.at/en/news/news_de ... icle/7826/

seasmith
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Re: Extraordinary Light

Unread post by seasmith » Thu Nov 15, 2012 9:08 pm

Isn't this clever?

"...optical signal via mechanical oscillator

Using tiny radiation pressure forces -- generated each time light is reflected off a surface -- University of Oregon physicists converted an optical field, or signal, from one color to another. Aided by a "dark mode," the conversion occurs through the coupling between light and a mechanical oscillator, without interruption by thermal mechanical vibrations.
so the coupling is oscillating
...achieving the dark mode, the color-conversion process is immune to thermal noise,
.. In the dark mode approach, we push and pull on the swings in a special way that generates a very particular pattern of swinging.
"As the child on the left hand side moves forward," Kuzyk continued, "the child on the right hand side moves backward, such that the middle child never moves.
essental vorticity

seasmith
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Re: Extraordinary Light

Unread post by seasmith » Fri Nov 16, 2012 8:44 pm

oops, left off the link for above post:

Nov 15th, 2012
Physicists skirt thermal vibration, transfer optical signal via mechanical oscillator

http://www.nanowerk.com/news2/newsid=27478.php?

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webolife
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Re: Extraordinary Light

Unread post by webolife » Sat Nov 17, 2012 3:04 pm

Yep... I might coin and start using the term "piezophotonic"...
Truth extends beyond the border of self-limiting science. Free discourse among opposing viewpoints draws the open-minded away from the darkness of inevitable bias and nearer to the light of universal reality.

seasmith
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Re: Extraordinary Light

Unread post by seasmith » Sat Nov 17, 2012 5:57 pm

webolife » Sat Nov 17, 2012 5:04 pm

Yep... I might coin and start using the term "piezophotonic"...

Meaning you can make sparks with a hammer ?
;)

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webolife
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Re: Extraordinary Light

Unread post by webolife » Sun Nov 18, 2012 6:55 pm

Yes, or with sticky tape, or gravitational compression, or...
But what I was thinking was that a measurable amount of pressure is detectable at any surface to which light is applied, but also that light is the result of field compression, collapse, or a potential drop, etc...
Truth extends beyond the border of self-limiting science. Free discourse among opposing viewpoints draws the open-minded away from the darkness of inevitable bias and nearer to the light of universal reality.

seasmith
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Re: Extraordinary Light

Unread post by seasmith » Sun Nov 25, 2012 4:32 am

light as charge dispersion

But what I was thinking was that a measurable amount of pressure is detectable at any surface to which light is applied, but also that light is the result of field compression, collapse, or a potential drop,…” -web
No argument there.
One might consider some “compression, collapse or …drop” as the longitudinal vectors of a light ‘beam’,
which seem always to manifest along with a transverse component as well.
These composite radiations are observed to relay spin and (angular/orbital) momentum onto intersecting bits of matter and so are lasers routinely used to squeeze, relax, deflect or otherwise manipulate, on a nano scale.
A cross-sectional image of a piezo~photonic impulse (hammerhead) would be the two at top of this page.
http://www.photonics.com/images2/Websit ... tices3.jpg
Or, imagining it with some depth, as a cymatic evolution over a duration.

In this particular instance, the pulse conveys spin which, depending on rate of precession about its longitudinal axis, expresses frequency. [There may be no such thing as light free of spin/polarization, unless it’s the mythical clear light, who knows?]

Upon encounter with plasma or some dielectric at electron scale, an excitation or ‘phonon’ is generated (perhaps at the electron’s magneto-sheath where double-layer interface ‘zones’ electrically pinch), and is imparted its own quantum of momentum, that then may be ejected to propagate as a plasmon/photon [nano-quasar scale].
All ammo for the piezo-photonic physicist.

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