Inspired perhaps by Harry Potter’s invisibility cloak, scientists have recently developed several ways to hide objects from view. The latest effort, begun at the University of Rochester, not only overcomes some of the limitations of previous devices, but also uses inexpensive, readily available materials in a novel configuration.
Forgoing specialized components, John Howell, a professor of physics at the University of Rochester, and graduate student Joseph Choi developed a combination of four standard lenses that keeps the object hidden as the viewer moves up to several degrees away from the optimal viewing position.
“This is the first device that we know of that can do three-dimensional, continuously multidirectional cloaking, which works for transmitting rays in the visible spectrum,” said Choi, a PhD student at Rochester’s Institute of Optics.
While their device is not quite like Harry Potter’s invisibility cloak, Howell had some thoughts about potential applications, including using cloaking to effectively let a surgeon “look through his hands to what he is actually operating on." The same principles could be applied to a truck to allow drivers to see through blind spots on their vehicles.
Also: Learn about ELID Grinding of Large Aspheres.