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Phys Rev Lett. 2011 Jan 21;106(3):033901. Epub 2011 Jan 18.

Macroscopic invisibility cloak for visible light.

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1
Singapore-MIT Alliance for Research and Technology Centre, Singapore 117543, Singapore.

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.

PMID:
21405275
DOI:
10.1103/PhysRevLett.106.033901
[Indexed for MEDLINE]
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