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dleske
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re: Glass invisibility cloak shields infrared
dleske   7/28/2010 10:40:56 AM
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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
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re: Glass invisibility cloak shields infrared
Tunrayo   7/25/2010 11:12:43 AM
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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
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re: Glass invisibility cloak shields infrared
pixies   7/24/2010 7:43:16 PM
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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
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re: Glass invisibility cloak shields infrared
unknown multiplier   7/24/2010 3:27:14 AM
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Invisibility to outside coexists with blindness just like regular cloak, right?

R_Colin_Johnson
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re: Glass invisibility cloak shields infrared
R_Colin_Johnson   7/23/2010 8:21:49 PM
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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?



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