A team of scientists from Technical University of Vienna developed a ‘Beam of Invisibility’ that could make an object invisible to the human eye
The mesmerizing car in James Bond’s Die another Day, which had the ability to disappear in plain sight could be a reality than merely a fictional idea. According to a recent research, cloaking could be achieved with the invention of a specially crafted material that can reflect light. In other words, most cloaking can be achieved by guiding the light waves around an object without necessarily allowing it to reflect it making the object effectively invisible to the human eye. This technique has proved handy in redirecting sound waves as well.
A team of scientists from Technical University of Vienna, have developed a rare technique to make an object invisible, which they called the Beam of Invisibility. According to Stephen Rotter, a theoretical physicist at the University of Vienna opaque objects such as sugar cubes are structured disorderly making the light scatter inside them multiple times. “A light wave can enter and exit the object, but will never pass through the medium on a straight line,” Rotter quoted. “Instead, it is scattered into all possible directions.”
It is possible to allow light pass straight through an object without being scattered inside, with this new technique. The technique consists of a beam or a laser shown on to an object from above to strike it with full of energy. This will tend the object to undergo changes in its properties making other wavelengths pass through it, thus making it invisible. The pattern of projection of the beam should match with the inner irregularities of the object, which commonly scatters the light. In order to make an object invisible it is important to record the inner patterns at a microscopic level.
So far, the experiment has worked with sound waves where it is possible for a loudspeaker to create sound waves that could make a tube transparent to other sounds. Rotter with his colleagues is now carrying out experiments to see if the idea works with light waves as well.