Design Con 2015
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?

December 2014 Cartoon Caption Contest: White Smoke Is Rising!
December 2014 Cartoon Caption Contest: White Smoke Is Rising!
"Remember when someone promised us change a few years ago? That's all we have left!"
2 comments
Flash Poll
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
Top Comments of the Week