Newsletters
News & Information for Technology Purchasers NewsFactor Sites:       NewsFactor.com     Enterprise Security Today     CRM Daily     Business Report     Sci-Tech Today  
   
This ad will display for the next 20 seconds. Click for more information, or
Home Enterprise I.T. Cloud Computing Applications Hardware More Topics...
Neustar, Inc.
Protect your website & network
using real-time information & analysis

www.neustar.biz
After Hours
24/7/365 Network Uptime
Average Rating:
Rate this article:  
Researchers Perfect a Kind of
Researchers Perfect a Kind of 'Invisibility Cloak' for Microwaves

By Barry Levine
November 12, 2012 1:48PM

    Bookmark and Share
Duke researchers, including grad student Nathan Landy, have indicated that this kind of invisibility would be difficult to achieve with visible light, but they've not ruled out that possibility. In addition to military uses, the microwave-targeted incarnation could find application in fiber optics, in order to bend light around physical corners in fiber cables.
 



Move over, Harry Potter. Scientists at Duke University say they have created a perfect "invisibility cloak."

Of course, this advance comes with a few catches. The cloaking is currently invisible only from one direction of viewing, and it is designed to work with microwaves, for possible uses in telecommunications or radar.

The cloak causes microwaves to flow around the object. To a perceiver, such as radar, space where the object resides appears to be empty, filled by the scene behind the object. The cloaking has worked on a cylinder that is 7.5 centimeters in diameter and 1 centimeter tall.

'Transformation Optics'

Invisibility research kicked into higher gear in 2006, following the publication of a paper by Duke researchers and Sir John Pendry of Imperial College London that presented the theory of "transformation optics." A cloak was demonstrated in 2006, but the Duke researchers described that incarnation as "very poor," largely because of reflections.

The researchers use a cloak created from artificial metamaterials that are constructed in a series of concentric circles and that interact with electromagnetic waves in ways different from natural materials. Theoretically, the metamaterials could hide an object of any size or material, at least from microwaves, but their first incarnation caused reflections that hindered the illusion.

Researchers Professor David Smith and graduate student Nathan Landy told news media that the reflections occurred at the boundaries of the cloak, not unlike reflections seen on clear glass -- a viewer can see through the glass, but is also aware of the presence of the glass because of reflections from the surface. In the first experiments six years ago, the purpose was primarily to demonstrate a proof of concept, so the reflections issue was left unresolved.

To solve this problem, they eventually tried to rework how the edges of the microwave cloak lined up, so that there would be no reflection to give away the object's position.

'Perfect Invisibility'

That original cloak was composed of parallel and intersecting strips of fiberglass etched with copper. The current cloak uses a similar row-by-row design, but copper strips have been added to create better performance and fewer reflections.

Professor Smith told BBC News that "this, to our knowledg, is the first cloak that really addresses getting the transformation exactly right to get you that perfect invisibility."

He also compared the current limitation of the technology -- being invisible only if it is seen from one direction -- to "the card people in Alice in Wonderland." The card people, Smith noted, can be nearly invisible if they turn their sides toward you, "but they're obviously visible if you look from the other direction."

The researchers have indicated that this kind of invisibility would be difficult to achieve with visible light, but, so far, they've not ruled out that possibility. In addition to potential military uses, the current microwave-targeted incarnation could also find application in fiber optics, in order to bend light efficiently around physical corners in fiber cables.

The new research has been published by Duke researchers in the Nov. 11 online issue of Nature magazine.
 

Tell Us What You Think
Comment:

Name:

Satewie:

Posted: 2012-11-12 @ 8:18pm PT
Sounds like they already have it for visible light. Why would a government with this technology for "microwaves only" release that information to the public, especially with the possibilities this type of technology brings.



You have the experience and skills, let an ISACA® certification demonstrate your value. Our certifications announce that you have the expertise and insight to speak with authority. ISACA certification is more than a credential; it's a platform that can elevate your career. Register for an Exam Today.


 After Hours
1.   MIT Finger Device Reads to the Blind
2.   Robot Writes Torah at Jewish Museum
3.   Review: Unlimited E-Book Services
4.   Alien Cast Members Reunite for Game
5.   Escort Charged in Google Exec Death


advertisement
MIT Finger Device Reads to the Blind
Like reading with the tip of your finger
Average Rating:
Review: Unlimited E-Book Services
Aiming to become the Netflix of e-books.
Average Rating:
Alien Cast Members Reunite for Game
Famous film starred Sigourney Weaver.
Average Rating:


advertisement
Product Information and Resources for Technology You Can Use To Boost Your Business

Network Security Spotlight
Report: Chinese Hackers Hit U.S. Personnel Networks
Hackers from China broke into the computer networks of the U.S. Office of Personnel Management earlier this year with the intention of accessing the files of tens of thousands of federal employees.
 
Charges: Russian Stole Data from U.S. Restaurants, Zoo
A Russian man arrested on bank fraud and other charges hacked into computers at restaurants in Washington, hundreds of other retail businesses, and even the Phoenix Zoo, authorities say.
 
Another Month, Another IE-Focused Patch Tuesday
Microsoft rolled out 59 vulnerabilities for Internet Explorer in June. But the IE-patching party is not over yet. Redmond published six new security bulletins on Tuesday; two, critical; three, important.
 

Navigation
NewsFactor Network
Home/Top News | Enterprise I.T. | Cloud Computing | Applications | Hardware | Mobile Tech | Big Data | Communications
World Wide Web | Network Security | Data Storage | Small Business | Microsoft/Windows | Apple/Mac | Linux/Open Source | Personal Tech
Press Releases
NewsFactor Network Enterprise I.T. Sites
NewsFactor Technology News | Enterprise Security Today | CRM Daily

NewsFactor Business and Innovation Sites
Sci-Tech Today | NewsFactor Business Report

NewsFactor Services
FreeNewsFeed | Free Newsletters | XML/RSS Feed

About NewsFactor Network | How To Contact Us | Article Reprints | Careers @ NewsFactor | Services for PR Pros | Top Tech Wire | How To Advertise

Privacy Policy | Terms of Service
© Copyright 2000-2014 NewsFactor Network. All rights reserved. Article rating technology by Blogowogo. Member of Accuserve Ad Network.