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OUT OF MIND » EARTH AWARENESS » SCIENCE & TECHNOLOGY » Scientists Say They've Found a Way to Make an Object Invisible From Every Angle

Scientists Say They've Found a Way to Make an Object Invisible From Every Angle

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PurpleSkyz

PurpleSkyz
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Scientists Say They've Found a Way to Make an Object Invisible From Every Angle  HarryPotterInvisibilityCloak_web_1024

Scientists Say They've Found a Way to Make an Object Invisible From Every Angle
"Our work represents a breakthrough in the quest for invisibility cloaking."
Scientists Say They've Found a Way to Make an Object Invisible From Every Angle  Futurism-logo-50x50
KRISTIN HOUSER, FUTURISM
1 JUL 2018
Researchers from Montreal's National Institute of Scientific Research (INRS) just published a study in Optica  detailing a new approach to invisibility cloaking.
Their device, called a spectral invisibility cloak, is the first to manipulate the color (or frequency) of the light waves that interact with an object, rendering it invisible.
"Our work represents a breakthrough in the quest for invisibility cloaking," study author José Azaña said in [url=https://www.osa.org/en-us/about_osa/newsroom/news_releases/2018/spectral_cloaking_could_make_objects_invisible_(1)/?utm_source=osaHome&utm_medium=slider&utm_term=sliderlink&utm_content=Optica Spectr]a news release[/url].
Let's break this down, starting with light. There's something called the electromagnetic spectrum . It contains all the different frequencies of electromagnetic radiation , a certain kind of energy. X-rays, gamma rays, and radar all fall somewhere on this spectrum.
While you can't see an X-ray, your eyes can see one small range of frequencies on the electromagnetic spectrum. We call this visible light. As mentioned, it's a range separated into what we perceive as colors, with violet at one end and red at the other. Some light sources contain more than one specific frequency. We call these broadband sources, and sunlight is one example.
When we "see" something, what we're really seeing is the interaction of these light frequencies and the object . When sunlight shines on a blue car, the car reflects the blue light frequency while all the other color frequencies simply pass through the object. Our eyes detect the reflected blue light, letting us see the blue car.
The INRS researchers' cloaking device takes advantage of this interaction. They describe an object that reflects only green light.
To make this object seem "invisible" to the human eye, they use a specially designed filter to temporarily shift the green frequencies in the broadband spectrum shining on the object to blue. Then, they use another filter to shift those frequencies back to green on the other side of the object.
The result? The human eye can't see the object.
Currently, the INRS researchers' cloaking device only works from one direction — the viewer's gaze needs to follow the path of the light, looking toward the object through the first filter.
However, Azaña claims the method could theoretically make an object invisible from every direction.
For now, the device could help secure telecommunications, which use broadband waves to transport data. Telecom companies could render certain frequencies along their fiber optic networks "invisible," preventing third-parties from using broadband light to spy on them.
So, while we still have a ways to go before we can all cosplay as the (really) Invisible Man at ComicCon, this complex cloaking contraption could potentially keep our data concealed in the meantime.
This article was originally published by Futurism . Read the original article.


Thanks to: https://www.sciencealert.com



  

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