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 journalOptics 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 cloaking devices 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.
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 visible spectrum of light, rather than only for specific frequencies.
The Latest on: Cloaking device
via Google News
The Latest on: Cloaking device
- World War II Almost Saw The Allies Employ 'Cloaking Devices' On Navy Shipson December 31, 2019 at 1:12 am
Cloaking devices are a staple of science fiction. But while a Klingon Bird-of-Prey materializing out of thin air makes for fun special effects, real-world stealth technology has mostly focused on ...
- Jumbo Phage Deploys Cloaking Device against CRISPR Defenseson December 11, 2019 at 12:00 am
Scientists at the University of Otago in New Zealand say they have discovered how viruses that specifically kill bacteria can outwit bacteria by hiding from their defenses. These findings are ...
- Your History Book Somehow Missed This: World War II's Failed Cloaking Deviceon December 9, 2019 at 9:55 am
Key Point: Some things are better left as science fiction. Cloaking devices are a staple of science fiction. But while a Klingon Bird-of-Prey materializing out of thin air makes for fun special ...
- An Invisibility Cloak designed by a Canadian companyon October 29, 2019 at 11:25 am
It was fascinating to see Alien spaceships using the cloaking device in the SciFi series Star Trek to mask their signature in space. Seems like we have taken the first step in that direction. A ...
- How to build a cheaper cloaking deviceon September 28, 2019 at 5:00 pm
A new cloaking device uses inexpensive, readily available materials to hide objects from view. “There’ve been many high tech approaches to cloaking and the basic idea behind these is to take light and ...
- Researchers Create “Romulan Cloaking Device”on September 26, 2019 at 5:36 am
On Star Trek, Captains Kirk and Picard often had to contend with their Romulan adversaries who possessed a “cloaking device” that rendered their ships invisible. On Star Trek, Captains Kirk and Picard ...
- Acoustic Cloaking Device Lets Sound Travel Uninterrupted Around Objectson August 16, 2019 at 5:00 pm
A new type of acoustic cloak would allow sound waves to travel around an object unimpeded, and could be used to build better concert halls, quiet spaces and noise-shielding head gear, researchers say.
- New cloaking devices could hide objects from water waves and currentson August 15, 2019 at 5:21 am
In addition to hiding objects from light waves under certain conditions (SN: 7/15/06, p. 42), researchers have made cloaking devices that can mask objects’ effects on other types of waves, including ...
- US warships get new cloaking deviceon July 12, 2019 at 5:00 pm
The Navy will use the wires to help change the magnetic profiles of their two ships, potentially cloaking them from metal-seeking mines. The company is hoping the ship-protection technology will lead ...
- No Cloaking Device Here: F-22 Stealth Fighters Can Be Trackedon May 20, 2019 at 4:51 pm
Moreover, the aircraft is often fitted with a Luneburg lens device on its ventral side during peacetime operations that enhances its cross section on radar. That being said, even combat-configured ...
via Bing News