Breaking News
News & Analysis

Glass invisibility cloak shields infrared

7/23/2010 06:52 PM EDT
5 comments
NO RATINGS
More Related Links
View Comments: Newest First | Oldest First | Threaded View
dleske
User Rank
Rookie
re: Glass invisibility cloak shields infrared
dleske   7/28/2010 10:40:56 AM
NO RATINGS
These "invisibility" materials tend to need a negative refractive index, which is normally difficult to achieve, as these reports on special materials reveal. You can easily experiment with these concepts at visible wavelengths by working under water: then you can get a negative refractive index from any clear material less dense than water - eg: air-filled cavities. Such as the effect within an aquarium that looking along a straight wall you can't see out = total internal reflection (TIR).

Tunrayo
User Rank
Rookie
re: Glass invisibility cloak shields infrared
Tunrayo   7/25/2010 11:12:43 AM
NO RATINGS
Well I guess it is only a matter of time before the Harry Porter cloaks are available. Although, this technology will have a number of positive applications such as safety (e.g. shielding human beings from dangerous microwave) - I am however more worried about the negative applications. For instance, Harry Porter cloaks would be useful sneaking around and robbing banks. Lol.

pixies
User Rank
Rookie
re: Glass invisibility cloak shields infrared
pixies   7/24/2010 7:43:16 PM
NO RATINGS
It will be very difficult to develop a cloak at visible spectrum. Even if the meta-material can be developed, it is only invisible to certain viewing angles. It may be simpler just to attend Hogwarts.

unknown multiplier
User Rank
Rookie
re: Glass invisibility cloak shields infrared
unknown multiplier   7/24/2010 3:27:14 AM
NO RATINGS
Invisibility to outside coexists with blindness just like regular cloak, right?

R_Colin_Johnson
User Rank
Blogger
re: Glass invisibility cloak shields infrared
R_Colin_Johnson   7/23/2010 8:21:49 PM
NO RATINGS
How long do you think it will take to find metamaterials for Harry Potter style invisibility cloaks? Invisibility cloaks are created from metamaterials--arrays of free-space resonators that are spaced at the wavelength of the light to be cloaked. The millimeter wavelengths of microwaves can be cloaked with millimeter sized resonators on a printed circuit board. But when you go to infrared wavelengths--measured in microns--you need resonators measured in microns. These researchers say that chalcogenide glass fits the fill by enabling micron-sizes resonators. Next they are looking for the nanometer-sized resonators needed to cloak visible wavelengths. How long do you think it will take to find metamaterials for Harry Potter style invisibility cloaks?

August Cartoon Caption Winner!
August Cartoon Caption Winner!
"All the King's horses and all the KIng's men gave up on Humpty, so they handed the problem off to Engineering."
5 comments
Top Comments of the Week
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Times on Twitter
EE Times Twitter Feed
Flash Poll
Radio
LATEST ARCHIVED BROADCAST
David Patterson, known for his pioneering research that led to RAID, clusters and more, is part of a team at UC Berkeley that recently made its RISC-V processor architecture an open source hardware offering. We talk with Patterson and one of his colleagues behind the effort about the opportunities they see, what new kinds of designs they hope to enable and what it means for today’s commercial processor giants such as Intel, ARM and Imagination Technologies.