Although it may seem like something worthy of science fiction, the truth is that today there are many research and development centers, financed with both public and private funds, that work in get the perfect camouflage, that is, that protective layer that, applied to any object, whatever its size, would be capable of make it invisible to the human eye.
As you are probably thinking, this technique is above all interesting, especially to be applied in a military environment, hence this is the market sector that is investing more funds today in this type of project. At this point I would like us to focus on talking about the new one, discovering that they have just published a team of researchers from the Montreal National Institute for Scientific Research since, despite the fact that their methodology, at the moment, is not infallible, they assure that their work represents a great advance in the search for invisibility.
Cloak of spectral invisibility is the name with which this interesting project has been baptized
Going into a little more detail and, after analyzing the paper which has been officially published by the team of researchers, we do not find that their devices, officially baptized with the name of spectral invisibility cloak, is the first of its kind to manage to manipulate the color, or rather the frequency, of the light waves with which a specific object interacts, making it invisible to the human eye.
Without going into too much detail, especially because a server is far from an expert in optics, tell you that the work of this group of researchers has focused on something as simple as exploiting the small range of frequencies that our eye is capable of. perceive from spectrum electromagnetic.
This invisibility cloak is capable of modifying the electromagnetic spectrum to make an object invisible to the eye.
In a very simple way, tell you that within visible light there is a complete range of colors that we are capable of perceiving, colors that go from violet to red, these being the two extremes visible by the human eye. Within this field there is the concept of broadband, this is nothing more than the fact that light sources contain more than one specific frequency.
Literally when 'see'something, what really happens is that we are contemplating the interaction of these light frequencies with the object. An example would be that when sunlight shines against a blue car, the car reflects the blue light frequency while other color frequencies simply pass through the object. This is precisely what the cloaking device that has been developed by the Montreal National Institute for Scientific Research takes advantage of.
To make the object look like 'invisible'the researchers have designed a special filter that is able to temporarily change the green frequencies in the broadband spectrum that shines on an object in question. Subsequently, another second filter is used to change these frequencies back to green on the other side of the object.
We are already working on an evolution capable of making any object, of any size and shape, completely invisible
Thanks simply to the use of these two filters, any object has been made invisible to the human eye. Unfortunately today this project has its limitations since, as those responsible for the project assure, at the moment it only works in one direction and the viewer's gaze must follow the path of the light looking directly at the object through the first filter.
Today the group of researchers is working on making an object invisible from all directions. Despite this limitation, today, the device could be interesting in helping us to protect our telecommunications since companies could make certain frequencies along their fiber optic networks 'invisible' thus getting third parties to use broadband light to spy on them.