Synopsis: More illusory than invisible

Bent light can do more than render objects invisible—it can make them appear as something else.
Synopsis figure
Illustration: adapted from Y. Lai et al., Phys. Rev. Lett. (2009)

Optical cloaking, a phenomenon that once only had connotations of Hollywood and science fiction, recently moved from fantasy to reality. In 2006, researchers effectively rendered an object invisible by sheathing it in an “invisibility cloak” made of a metamaterial [1], which is a class of artificial composite materials with electromagnetic properties that are more varied than those of their constituents.

Recently, Yun Lai and coauthors at the Hong Kong University of Science and Technology proposed the concept of “cloaking at a distance” with a specially designed metamaterial [2]. Now, in a paper appearing in Physical Review Letters, they go a step further. Using the techniques of transformation optics, which allows Maxwell’s equations and topology to bend the space through which light passes, they describe how a particular object could be optically transformed into another: a spoon may appear to be a cup, or one may see a peephole where there is really a solid wall. Rendering an object invisible then becomes one case out of many possible illusions. We await the experimental realization. – Sami Mitra

[1] D. Schurig et al., Science 314, 977 (2006).

[2] Y. Lai et al., Phys. Rev. Lett. 102, 093901 (2009); T. Philbin, Physics 2, 17 (2009).


Features

More Features »

Announcements

More Announcements »

Subject Areas

OpticsMetamaterials

Previous Synopsis

Biological Physics

Protein diffusion

Read More »

Next Synopsis

Related Articles

Synopsis: Atoms Feel New Force
Atomic and Molecular Physics

Synopsis: Atoms Feel New Force

Laser light can stretch and squeeze a whole cloud of atoms with a collective force. Read More »

Focus: Modeling Imperfections Boosts Microscope Precision
Optics

Focus: Modeling Imperfections Boosts Microscope Precision

A theoretical model of light spreading and scattering improves precision of position and size measurements made with an optical microscope by as much as 100 times. Read More »

Synopsis: Attosecond X-Ray Flashes
Optics

Synopsis: Attosecond X-Ray Flashes

X-ray free-electron lasers have been used to generate single spikes of hard x rays that are only 200 attoseconds long. Read More »

More Articles