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Visible-light cloaking of large objects
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By Hamish Johnston
If you type the word “invisible” into the search engine on arXiv.org you get a very curious result. Two papers with nearly identical titles, uploaded three days apart.
A quick scan of both papers, which are by separate groups, reveals that they are both about roughly the same thing – the first invisibility cloak that works on large objects illuminated with visible light.
This promises to be a major breakthrough in the world of cloaking and I understand that one paper is destined for a prestigious journal; I’m not sure about the other.
We have a crack reporter looking into it. More later…
In the meantime you can read the papers here and here.
TrackBack
1.
Macroscopic Invisibility Cloaking of Visible Light
(Submitted on 13 Dec 2010)
Abstract: Invisibility cloaks of light, which used to be confined to the imagination, have now been turned into a scientific reality, thanks to the enabling theoretical tools of transformation optics and conformal mapping. Inspired by those theoretical works, the experimental realisation of electromagnetic invisibility cloaks has been reported at various electromagnetic frequencies. All the invisibility cloaks demonstrated thus far, however, have relied on nano- or micro-fabricated artificial composite materials with spatially varying electromagnetic properties, which limit the size of the cloaked region to a few wavelengths. Here we report realisation of a macroscopic volumetric invisibility cloak constructed from natural birefringent crystals. The cloak operates at visible frequencies and is capable of hiding three-dimensional objects of the scale of centimetres and millimetres. Our work opens avenues for future applications with macroscopic cloaking devices.
From: Shuang Zhang [view email]
[v1] Mon, 13 Dec 2010 16:03:53 GMT (1496kb)
[v1] Mon, 13 Dec 2010 16:03:53 GMT (1496kb)
2.
Macroscopic Invisible Cloak for Visible Light
[v1] Fri, 10 Dec 2010 11:42:02 GMT (471kb)
[v2] Tue, 21 Dec 2010 11:24:31 GMT (559kb)
(Submitted on 10 Dec 2010 (v1), last revised 21 Dec 2010 (this version, v2))
Abstract: Invisibility cloaks, a subject that usually occurs in science fiction and myths, have attracted wide interest recently because of their possible realization. The biggest challenge to true invisibility is known to be the cloaking of a macroscopic object in the broad range of wavelengths visible to the human eye. Here we experimentally solve this problem by incorporating the principle of transformation optics into a conventional optical lens fabrication with low-cost materials and simple manufacturing techniques. A transparent cloak made of two pieces of calcite is created. This cloak is able to conceal a macroscopic object with a maximum height of 2 mm, larger than 3500 free-space-wavelength, inside a transparent liquid environment. Its working bandwidth encompassing red, green and blue light is also demonstrated.
Submission history
From: Baile Zhang [view email][v1] Fri, 10 Dec 2010 11:42:02 GMT (471kb)
[v2] Tue, 21 Dec 2010 11:24:31 GMT (559kb)
https://m.sciencenet.cn/blog-506324-396061.html
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