Time To Go Invisible
Scientists have revealed a way to go invisible just by adjusting the lens. This new discovery will pave the way for building the most anticipated cloth—the invisibility cloak
At long last, a device has been discovered through which one can go invisible. The researchers at the University of Rochester, are reporting that they’ve built the first invisibility cloak, that works in three dimensions, viewed from a range of angles, across the full spectral range of visible light. Though it is not some futuristic belt or a wizard cape, but, it is a clever configuration of standard lenses that bend light around an object, hiding that object in plain sight.
The Rochester’s invisibility cloak can do three-dimensional, continuously multidirectional cloaking, which works for transmitting rays in the visible spectrum. Which means it can make anything invisible as long as the lenses can cover it. The cloak works with use of four lenses. When the lenses are arranged correctly (as dictated by their focal lengths), they create a region of invisibility. The caveat, of course, is that the observer needs to be looking through the lenses (up to an angle of 15 degrees off-centre)—but, you can make the lenses as large as you like, so you can still do a pretty good job of making things disappear. Because these are just your standard lenses—like you might find in your spectacles or DSLR—they work across the entire visible light spectrum, and also a few other frequencies as well. The grid lines behind the object show that the very little distortion is introduced by the lenses, meaning the quality of invisibility is quite high.
Although the fundamental principles of cloaking are always the same–namely, to bend light around an object–many approaches depend on complicated gadgetry or other exotic materials to make something disappear. Even then, the cloaking device only works when you’re looking at it head on: move your head just an inch to the left, and the ‘cloaked’ object pops back into view.
By Rohan Pal