Developing the cloak of invisibility would be wonderful, but sometimes simply making an object appear to be something else will do the trick, according to Penn State electrical engineers.
“Previous attempts at cloaking using a single metasurface layer were restricted to very small-sized objects,” said Zhi Hao Jiang, postdoctoral fellow in electrical engineering, Penn State. “Also, the act of cloaking would prevent an enclosed antenna or sensor from communicating with the outside world.”
Jiang and Douglas H. Werner, John L. and Genevieve H. McCain Chair Professor of Electrical Engineering, developed a metamaterial coating with a negligible thickness that allows coated objects to function normally while appearing as something other than what they really are, or even completely disappearing. They report their research in Advanced Functional Materials.
The researchers employ what they call “illusion coatings,” coatings made up of a thin flexible substrate with copper patterns designed to create the desired result. They can take a practical size metal antenna or sensor, coat it with the patterned film and when the device is probed by a radio frequency source, the scattering signature of the enclosed object will appear to be that of a prescribed dielectric material like silicon or Teflon. Conversely, with the proper pattern, they can coat a dielectric and it will scatter electromagnetic waves the same as if it were a metal object.
“The demonstrated illusion/cloaking coating is a lightweight two-dimensional metasurface, not a bulky three-dimensional metamaterial,” said Werner.
The researchers take the object they want cloaked and surround it with a spacer, either air or foam. They then apply the ultrathin layer of dielectric with copper patterning designed for the wavelengths they wish to cloak. In this way, antennae and sensors could be made invisible or deceptive to remote inspection.
Another application of this material would be to protect objects from other emitting objects nearby while still allowing electromagnetic communication between them. This was not possible with the conventional transformation optics-based cloaking method because the cloaking mechanism electromagnetically blocked the cloaked object from the outside, but this new coating allows the object surrounded to continue working while being protected. In an array of antennae, for example, interference from the nearby antennas can be suppressed.
The Latest on: Illusion coatings
via Google News
The Latest on: Illusion coatings
- Mathematical arton April 6, 2020 at 8:16 am
The exhibition features a large collection of works which give a good sense of how Escher’s art developed. His early woodcuts of scenes from the Bible already have a distinctive style with echoes of ...
- People Can Experience Psychedelic Effects From Taking a Placebo, Study Showson April 5, 2020 at 8:16 am
The placebo effect is weird. When it takes place, people who haven't taken anything stronger than a sugar pill appear to respond as if they'd actually taken a real drug. This strange phenomenon has ...
- Gaia and Shekhina Speakon April 1, 2020 at 10:20 am
But having the illusion of safety erased, that’s uncertainty of another magnitude ... I knew there would be a stark contrast in each painting between the aging face and the wild energy of the element ...
- Incredibly Realistic Paintings Look Like They’re Wrapped in Plastic Filmon March 27, 2020 at 9:29 am
Artist Robin Eley is a master of painting illusions. His diverse body of work has received wide acclaim for ... to show that the incredibly realistic plastic film is, in fact, an oil-rendered illusion ...
- Optical Illusion Created by Butterflies’ Wing Scales Is Secret to Ultra-Black, Lightweight Materialson March 22, 2020 at 1:28 pm
It’s an optical illusion created by the 3-D structure of the butterflies ... Ultimately, the findings could help engineers design thinner ultra-black coatings that reduce stray light without weighing ...
- Group exhibition ‘Bangladesh’ marking birth centenary of Bangabandhuon March 22, 2020 at 11:13 am
A peaceful shade of blue, together with the illusion of wash technique and precise white space, enhances the mystique quality of the painting. Puthiar Rajbari by Masud Ahmed offers a beautiful ...
- Paint the townon March 19, 2020 at 3:48 am
The fliers pull people in with their illusion of legitimacy ... Dale has noticed that “the buff has gotten more aggressive. The scraping, and painting, and the silver spray paint on the backs of signs ...
- 3D illusion museum offers otherwordly experienceon March 18, 2020 at 9:23 am
SARASOTA — Slowly and gingerly, Sharyn Chan added pigment to the left arm of her latest creation, a fairy mermaid she is painting on an inside wall at the Chalk Festival 3D Illusion Museum ...
- Augmented Reality: Meet the artists creating the future of storytellingon March 17, 2020 at 7:21 am
The illusion of proximity makes the work really ... Andrew draws inspiration from traditional lettering techniques like sign painting, graffiti, and fileteado, an Argentinian painting style.
- Black butterfly wing structure inspires ultra-dark, lightweight materialson March 11, 2020 at 10:10 am
The secret to this dark coating is due to an optical illusion created by the 3D structure of the butterflies’ wing scales. Using a high-resolution scanning electron microscopy and computer simulations ...
via Bing News