Invisibility cloak

This area is for the discussion of what's new, what's on your mind, and general photographic topics. A place to meet, make comments on this site, and get the latest community news.

Moderators: ChrisR, Chris S., Pau, rjlittlefield

elf
Posts: 1398
Joined: Sun Nov 18, 2007 12:10 pm

Invisibility cloak

Post by elf »

Interesting effect, but I'm not sure how we can use it in photomicrography:
http://www.rochester.edu/newscenter/wat ... les-70592/

rjlittlefield
Site Admin
Posts: 20984
Joined: Tue Aug 01, 2006 8:34 am
Location: Richland, Washington State, USA
Contact:

Post by rjlittlefield »

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

ChrisR
Site Admin
Posts: 8557
Joined: Sat Mar 14, 2009 3:58 am
Location: Near London, UK

Post by ChrisR »

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.

GemBro
Posts: 261
Joined: Wed Aug 20, 2014 5:20 pm
Location: Surrey [UK]

Post by GemBro »

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

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

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

Gem
Canon 550D(T2i) ML (Nightly Builds) | Canon 5D MKII | Raynox 250 | Palinar 35mm f2.8 (reversed) | EL-Nikkor 50mm f2.8 N | EL-Nikkor 50mm f4 N | EL-Nikkor 50mm f4 | Bellows | Objectives: LOMO 3.7x 0.11 : 8x 0.20 : 40x 0.65
RiG II - 'Bamboo': Olympus CH Focus Block with Inverted Arca/Swiss | Canon 430 EX (x2) | Olympus T20 flash (x2) | Youngnuo YN-622C Wireless triggers (x3) | Ikea Jansjo 3W LED Lighting (x3)
Stepper Motor Focusing System (Helicon Remote)

Post Reply Previous topicNext topic