'Cloaking' device uses ordinary lenses to hide objects across continuous range of angles

'Cloaking' device uses ordinary lenses to hide objects across continuous range of angles
A side view. The laser shows the paths that light rays travel through the system, showing regions that can be used for cloaking an object. Credit: Adam Fenster / University of Rochester

Inspired perhaps by Harry Potter's invisibility cloak, scientists have recently developed several ways—some simple and some involving new technologies—to hide objects from view. The latest effort, developed at the University of Rochester, not only overcomes some of the limitations of previous devices, but it uses inexpensive, readily available materials in a novel configuration.

"There've been many high tech approaches to cloaking and the basic idea behind these is to take light and have it pass around something as if it isn't there, often using high-tech or exotic materials," said John Howell, a professor of physics at the University of Rochester. Forgoing the specialized components, Howell 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 Ph.D. student at Rochester's Institute of Optics.

The details of the device are now published in the journal Optics Express.

Many cloaking designs work fine when you look at an object straight on, but if you move your viewpoint even a little, the object becomes visible, explains Howell. Choi added that previous can also cause the background to shift drastically, making it obvious that the cloaking device is present.

In order to both cloak an object and leave the background undisturbed, the researchers determined the lens type and power needed, as well as the precise distance to separate the four lenses. To test their device, they placed the cloaked object in front of a grid background. As they looked through the lenses and changed their viewing angle by moving from side to side, the grid shifted accordingly as if the cloaking device was not there. There was no discontinuity in the grid lines behind the cloaked object, compared to the background, and the grid sizes (magnification) matched.

'Cloaking' device uses ordinary lenses to hide objects across continuous range of angles
University of Rochester Ph.D. student Joseph Choi is pictured with a multidirectional "perfect paraxial" cloak using four lenses. Credit: Adam Fenster / University of Rochester

The Rochester Cloak can be scaled up as large as the size of the lenses, allowing fairly large objects to be cloaked. And, unlike some other devices, it's broadband so it works for the whole of light, rather than only for specific frequencies.

Their simple configuration improves on other cloaking devices, but it's not perfect. "This cloak bends light and sends it through the center of the device, so the on-axis region cannot be blocked or cloaked," said Choi. This means that the cloaked region is shaped like a doughnut. He added that they have slightly more complicated designs that solve the problem. Also, the has edge effects, but these can be reduced when sufficiently large lenses are used.

In their paper, Howell and Choi provide a mathematical formalism for this type of cloaking that can work for angles up to 15 degrees, or more. They use a technique called ABCD matrices that describes how light bends when going through lenses, mirrors, or other optical elements.

While their device is not quite like Harry Potter's , 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," he said. The same principles could be applied to a truck to allow drivers to see through blind spots on their vehicles.

Howell became interested in creating simple cloaking devices with off-the-shelf materials while working on a holiday project with his children. Together with his 14 year-old son and Choi, he recently published a paper about some of the possibilities, and also demonstrated simple cloaking with mirrors, like magicians would use, in a brief video.

More information: Joseph S. Choi and John C. Howell, "Paraxial ray optics cloaking," Opt. Express 22, 29465-29478 (2014) www.opticsinfobase.org/oe/abst … m?URI=oe-22-24-29465

Journal information: Optics Express

Citation: 'Cloaking' device uses ordinary lenses to hide objects across continuous range of angles (2014, November 19) retrieved 19 April 2024 from https://phys.org/news/2014-11-cloaking-device-ordinary-lenses-range.html
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'Cloaking' device uses ordinary lenses to hide objects across range of angles

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