Published On: Wed, Jul 8th, 2015

A new cloaking device developed for hiding objects



Engineers at the University of california, San Diego designed a new cloaking device for activity objects that overcomes a number of the restrictions of existing ‘invisibility cloaks’. The technology behind this cloak can have additional applications than invisibility, like concentrating solar energy and increasing signal speed in optical communications.

“Full invisibility still looks beyond reach today, but it would become a reality within the close to future because of recent progress in cloaking devices, ” said Boubacar Kante, senior author of the study.

As their name implies, cloaks are devices that cover objects to form them seem invisible. the concept behind cloaking is to vary the scattering of electromagnetic waves – like lightweight and radar – off an object to form it less detectable to those wave frequencies. One among the drawbacks of cloaking devices is that they’re generally large.

“Previous cloaking studies required several layers of materials to cover an object, the cloak all over up being abundant thicker than the scale of the item being lined, ” said Li-Yi Hsu, the first author of the study. “We show that we will use a skinny single-layer sheet for cloaking, ” said Li-Yi Hsu.

The researchers said that their cloak additionally overcomes another basic drawback of existing cloaking devices: being “lossy.” Cloaks that are lossy replicate light at a lower intensity than what hits their surface.

“What we’ve got achieved during this study may be a ‘lossless’ cloak. It will not lose any intensity of the light that it reflects, ” mentioned Boubacar Kante.

Many cloaks are lossy as a result of they’re created with metal particles, that absorb light. The researchers report that one among the keys to their cloak’s style is that the use of non-conductive materials referred to as dielectrics, that not like metals don’t absorb light.

The cloak includes 2 dielectrics, a proprietary ceramic and Teflon, that are structurally tailored on an awfully fine scale to vary the method light waves replicate off of the cloak. In their experiments, the researchers specifically designed a “carpet” cloak, that works by cloaking an object sitting on prime of a flat surface. The cloak makes the entire system – object and surface – seem flat by mimicking the reflection of light off the flat surface.

Any object reflects light otherwise from a flat surface, however once the item is covered by the cloak, lightweight from completely different points is reflected out of synchronise, effectively cancelling the distortion of sunshine caused by the object’s shape.

“This cloaking gadget fools the observer into thinking that there is a flat surface, ” said Kante.

The study was revealed within the journal Progress In electromagnetic research.

Subrat Sahu 1Subrat Kumar is a writer with expertise in content writing for websites and blogs, press releases, whitepapers and case-studies. He loves web development management and currently freelances from Bangalore. He’s the founder of Cross Zone, undertaking the bulk of articles on technology and gadgets.

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