The antennas in the cloak manipulate the light as it hits the object in a way that makes it look like it’s bouncing off a flat surface instead – making it impossible to see the geometry of the object. The cloak hides objects by wrapping them in layer of gold nanoantennas - only 80 nanometers thick. While we are still some way away from doing this, we are getting closer. While this could be useful to hide things from for specific devices, such as radar, it would have to be improved to scatter lights from all wavelengths on the visible spectrum to be able to hide from the human eye. The downside? It only works for light at 730-nanometer wavelength, which is visible light near the infrared part of the spectrum. And perhaps the most important feature is that the technology could be scaled up to hide bigger objects. It is ultra thin and able to conceal a small three-dimensional object measuring 36 by 36 micrometers by completely reflecting a wavelength of visible light, which has not been done before. The new cloak is more sophisticated than past devices. Image: c/o Xiang Zhang group, Berkeley Lab/UC Berkeley.
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#INVISIBLE CLOAK HOW TO#
But while physicists have figured out the concept for how to make invisibility cloaks, they are yet to build a practical device that can hide human-sized objects in the way that Harry Potter’s cloak, say, can. Invisibility has long been one of the marvels in science fiction and fantasy – and more recently in physics.
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