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Invisibility Cloaks Now Shield People from Sight

Visible wavelength metamaterials get active
1/31/2015 04:27 PM EST
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RichQ
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Re: bronken link
RichQ   2/3/2015 12:12:41 PM
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Thanks for pointing that out. It should be fixed now.

Denis.Giri
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bronken link
Denis.Giri   2/3/2015 3:52:13 AM
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the link "Next Page: Visible light cloaks now" leads to admin-only section of the website, and is therefore broken, please fix it.

Until then, the link "Page 1 / 2 Next >" works properly.

R_Colin_Johnson
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Re: why fake?
R_Colin_Johnson   2/2/2015 7:45:29 PM
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GSKrasle: Thanks for your informative comment, I'll bet the researchers are trying just those techniques for their next iteration. Thanks again for your expertise.

GSKrasle
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Re: why fake?
GSKrasle   2/2/2015 6:10:29 PM
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You can fake the center if you use direction-changers in the optical path: mirrors or coherent fibre-bundle..., lika a laparoscope.

But why not just a camera and screen? Unless viewing-angle/direction or depth-of-field is important, then something like this is fine:

http://en.videobuzzy.com/Invisible-car-by-Mercedes-385.news

.

R_Colin_Johnson
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Re: That is cool
R_Colin_Johnson   2/2/2015 5:42:49 PM
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philm: Thanks for the tip on the Edmund Scientific tip (who happens to be in my neighborhood in Portand, Ore.) And of you skeptics out there should try the kit, although I have not tried it myself I would like to hear about your experiences again. Thanks again, philm, for the ES tip.

R_Colin_Johnson
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Re: Why fake? Not fake.
R_Colin_Johnson   2/2/2015 5:39:11 PM
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traneus: Thanks for the support--the photo is not fakes, nor is it misleading because both the text and the video clearly state and show that you cannot obscure the middle of the lens or the effect will not work. The researchers are working toward more complicated set-ups that will allow the objects in the center to be cloaked too, which sound impossible to me, but they may have a trick or two up their sleeves to make it work. Thanks again for you thoughful comment and the easy-to-check rifle scope reference.

R_Colin_Johnson
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Re: why fake?
R_Colin_Johnson   2/2/2015 5:35:05 PM
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philm: Excellent observation--it looks fake--but believe me it is very real. Cloaking using lenses is a very simple procedure--but you cannot cloak the very middle of he lens where all the photons are concentrated, which is very clearly stated in the article. Thanks again for you thoughful comment.

traneus
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Why fake? Not fake.
traneus   2/2/2015 5:17:52 PM
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I think the image is not fake. I read the Rochester group's paper a few weeks ago. The image is from their paper.

The whole point of the optical cloak, is that the image seen in the lens is identical to the image that would be seen if the lens assembly was removed. Thus, the lens showing the same grid as the background, is real and is what is wanted.

The man cannot move his head further to the left (his right), as the side of his eye is already resting against the middle barrel of the optical assembly.

The photo is misleading as it leads viewers to conclude that the man could move his head further to the left (his right), but he can't as the barrel is in the way.

Look up riflescopes to see the shape of the optical assembly. This is a 1X riflescope. The middle barrel is smaller in diameter than the end lenses: This smaller barrel diameter is the claimed cloaking effect.

philm
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Re: why fake?
philm   2/2/2015 4:24:29 PM
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It looks fake because he did an excellent job of placing his head to where the lens holder looks like a monocle and is very creepy. The light reflected from his missing eye is not being refracted by the lens into the imaging sensor. Only the light from the focal point slightly to left of his head which is the light from the back grid. If his face is moved in farther to the left, you would see it.

Goddds
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why fake?
Goddds   2/2/2015 2:05:30 PM
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The U. Rochester picture looks a fake. why is the invisible portion of the face the same as the lens and why is the background wall paper still visible? Remind me the UW cold fusion ... 

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