Posted on 06/01/2022 10:27:21 AM PDT by BenLurkin
"When light spreads in an inhomogeneous medium, it undergoes scattering. This effect quickly transforms a compact, directed beam into a diffuse glow, and is familiar to all of us from summer clouds and autumn fog alike," Professor Alexander Szameit of the Institute for Physics at the University of Rostock describes the starting point of his team's considerations. Notably, it is the microscopic density distribution of a material that dictates the specifics of scattering. Szameit continues, "The fundamental idea of induced transparency is to take advantage of a much lesser-known optical property to clear a path for the beam..."
This second property, known in the field of photonics under the arcane title of non-Hermiticity, describes the flow of energy, or, more precisely, the amplification and attenuation of light. Intuitively, the associated effects may seem undesirable—particularly the fading of a light beam due to absorption would seem highly counterproductive to the task of improving signal transmission. Nevertheless, non-Hermitian effects have become a key aspect of modern optics, and an entire field of research strives to harness the sophisticated interplay of losses and amplification for advanced functionalities.
In fact, induced transparency is just one of the fascinating possibilities that arise from these findings. If an object is truly to be made to vanish, the prevention of scattering is not enough. Instead, light waves must emerge behind it completely undisturbed. Yet, even in the vacuum of space, diffraction alone ensures that any signal will inevitably change its shape. "Our research provides the recipe for structuring a material in such way that light beams pass as if neither the material, nor the very region of space it occupies, existed. Not even the fictitious cloaking devices of the Romulans can do that," says co-author Dr. Matthias Heinrich, circling back to the final frontier of Star Trek.
(Excerpt) Read more at phys.org ...
Whoopi needs a A-Frame.
I’ve seen formerly hot girls turn invisible when they hit 40.
Yep. You can see right through them.
“If this is available in a fabric, maybe we can design a new line of clothing for the View and it’s followers.”
What is your motive? Are you an eye-bleach salesman?
OMG, I just realized that the clothes themselves would be invisible!!!!.... Strike that, I’m having designed new Dallas Cowboy Cheerleader costumes with this material.
My understanding of matter and light (electromagnetic spectrum) make transparency for matter of specific properties possible. It’s basically understanding the photoelectric effect, as long as the wavelengths are below a threshold the wave will pass through the matter without any loses, transparency.
The problem is being able to construct matter with the correct electron shell structure and physical properties that gives you what you want.
I am available for employment if you want to investigate these properties and ready to create transparent materials.
I fully support that idea!
Hi.
Banks are going to have a problem with robberies.
Tiffany’s too.
Hell, soon the gas pump. Or sneaking into the Soros compound in NY...or
5.56mm
“Can we use it to make Biden disappear?” [Orosius, post 7]
The optical phenomena being researched wouldn’t help. If they work, these techniques would simply allow light beams to pass through him undisturbed.
He’d be invisible, but still there.
“If a LASER can take the light, direct it in a certain direction, why not create a panel which takes the light and “directs” it in the same direction it came from,... This would obviously require a huge amount of computing capability...” [wbarmy, post 9]
Sorry, won’t work for two reasons.
Laser light and natural light are not the same.
1. Emissions from a laser are so coherent and of such a narrow bandwidth (which means a only tiny difference in wavelength across their spectrum of emitted light) that they are affected pretty much the same by any material they pass through or are reflected by. So they all bounce the same way or bend the same amount.
Natural light - from stars, or light bulbs, or candle flames etc is not coherent and contain much larger bandwidths (many different wavelengths, aka colors). Natural beams reflect or refract in different ways and amounts according to their color. Much more difficult to predict or imitate. But it’s why “white” light splits into many colors on passing through a prism.
2. Light is not strictly photons. It also has wave properties; if it reflects from and object or is refracted passing through it, the wave phase can change and so can the polarization. True of all light: laser beams, or candle flames alike.
In fact, these properties apply to all forms electromagnetic radiation, from miles-long radio waves, through VHF and UHF radio and higher frequencies, microwaves, IR, ultraviolet, X-rays, even cosmic rays (highest frequency commonly known).
Visible light is only a tiny part of the electromagnetic spectrum, between IR and ultraviolet in frequency.
I’m neither a physicist nor an astronomer, but it sounded as if some of the article’s text seemed to refer to processing of imagery & signals from telescopic observations of stars and galaxies. The techniques being researched here could prove useful in creating more accurate pictures and better overall understanding of the objects being observed.
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