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Invisibility cloak

 
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elf



Joined: 18 Nov 2007
Posts: 1284

PostPosted: Tue Nov 04, 2014 11:37 am    Post subject: Invisibility cloak Reply with quote

Interesting effect, but I'm not sure how we can use it in photomicrography:
http://www.rochester.edu/newscenter/watch-rochester-cloak-uses-ordinary-lenses-to-hide-objects-across-continuous-range-of-angles-70592/
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rjlittlefield
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Joined: 01 Aug 2006
Posts: 17417
Location: Richland, Washington State, USA

PostPosted: Tue Nov 04, 2014 12:09 pm    Post subject: Reply with quote

A clever technique, well presented.

The illustrations lead me to think "Wow! This thing must be magic".

But as the text explains, "This cloak bends light and sends it through the center of the device, so the on-axis region cannot be blocked or cloaked,” said Choi. This means that the cloaked region is shaped like a doughnut.

A close examination of the illustrations shows that, indeed, the cloaked object would not cover the center of the lenses. But that's not at all obvious in the photos, particularly the hand-with-a-hole where the light ended up passing through the V between two fingers. This definitely is magic, in the senses of both theater and Arthur C. Clarke ("Any sufficiently advanced technology is indistinguishable from magic").

The full paper is pretty readable: http://arxiv.org/pdf/1409.4705v1.pdf. Figure 4 shows a good summary of how the thing works.

--Rik
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ChrisR
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Joined: 14 Mar 2009
Posts: 6625
Location: Near London, UK

PostPosted: Tue Nov 04, 2014 2:52 pm    Post subject: Reply with quote

See Surplus Shed's "Featured Item" L14575 - a kit of parts to make one of the above, they say. I saw "Thorlabs" on the actual demo lenses.
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GemBro



Joined: 20 Aug 2014
Posts: 261
Location: Surrey [UK]

PostPosted: Wed Nov 05, 2014 6:42 pm    Post subject: Reply with quote

Clever ... now all they have to do is cloak the Lens Holders ... and so on and so on ... Very Happy ...

Being a Techy ... this is my kind of cloaking ...

http://www.youtube.com/watch?v=uHWfFFi1k9Y

Gem
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