Comments on: The cloaking craze: A look at the original papers

By: skullsinthestars

skullsinthestars — Wed, 21 Mar 2012 16:14:59 +0000

Interesting thought! LCDs do have anisotropy, though I have a feeling that they can’t produce the dramatic variations in refractive index needed in order to make a working cloak. Something to think about though…

And you’re welcome!

By: Michelle

Michelle — Sun, 18 Mar 2012 07:59:15 +0000

I was wondering if LCD’s would be a viable material. They are organic and can be manipulated by man, and have multiple refractive index capabilities. (http://en.wikipedia.org/wiki/Liquid_crystal)

I am an artist, not a scientist, and I found this article to be very helpful in my developing study of light waves. I am hoping to eventually find an understanding of relationships between vibrations of color and light with each other. thank you for your assistance!
Michelle

By: Jose

Jose — Mon, 01 Aug 2011 22:03:36 +0000

thanks! and nice job

By: skullsinthestars

skullsinthestars — Thu, 21 Jul 2011 16:09:38 +0000

Actually, that’s an image I drew myself! Feel free to use it; you can refer to this blog if you like.

By: Jose

Jose — Thu, 21 Jul 2011 14:19:49 +0000

Could you please tell me the references of the image “http://skullsinthestars.files.wordpress.com/2008/06/refraction.jpg?w=253&h=273″. I would like to use for my thesis. Regards

By: Cloaking from earthquakes : Stochastic Scribbles

Cloaking from earthquakes : Stochastic Scribbles — Tue, 21 Jul 2009 01:52:34 +0000

[...] the possibility of creating invisibility cloaks using metamaterials? While perfect invisibility can theoretically be achieved, one big problem is that light cannot [...]

By: sammedpatil

sammedpatil — Mon, 04 May 2009 16:31:09 +0000

I have just few questions about application of the same concept /method in case of elastic wave , because there appeared many papers concerning this but is it possible for elastic waves which are mechanical waves caused by disturbing the medium as compared to EM waves which have there own fields and in the case of an EM wave, object getting cloaked for external EM waves rather nothing related to the object participation but only interaction with EM waves. If we consider Elastic waves ,this is due to the just the propagating wavy deformation and nothing called actual wave, and both the participant and creator are the same so how can is it possible to cloak for the elastic waves. One way to do is just by modifying mechanically medium properties like (a few) higher damping, creating inclusions to reduce stress concentration etc. which indirectly means cloaking the effect from the material next to the modified one.

By: skullsinthestars

skullsinthestars — Thu, 14 Aug 2008 15:20:05 +0000

David Schurig: Thanks for the comment! I completely agree about the anisotropy point; I’m revising the post slightly to fix the inaccuracy.

By: David Schurig

David Schurig — Thu, 14 Aug 2008 13:42:54 +0000

Great tutorial on cloaking! Your understanding is better than many of my colleagues. One fine point, we are aware of the scattering uniqueness theorems that seem to make cloaking impossible, and it’s really the anisotropy of our materials that provide the loop hole, not the magnetic response.

By: skullsinthestars

skullsinthestars — Wed, 13 Aug 2008 23:09:06 +0000

Derek: Thanks for the comment! There would be a problem with delays, though it would work in a slightly different manner: light has to travel faster than the vacuum speed in the material in order to make a perfect cloak. This can only be done for a small range of frequencies at a time, and at all other frequencies the waves coming out of the cloak wouldn’t match up with the waves passing outside the cloak. The net result would be some sort of distorted image which could be detected.