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 »

Subject Areas

OpticsMetamaterials

Previous Synopsis

Biological Physics

Protein diffusion

Read More »

Next Synopsis

Related Articles

Synopsis: Making Optical Fibers Immune to Bending
Optics

Synopsis: Making Optical Fibers Immune to Bending

Bending an optical fiber can distort light traveling through it, but such a distortion can be mitigated in fibers with a smoothly varying refractive-index profile.   Read More »

Viewpoint: Electrons Film Phonon Dynamics in Full
Materials Science

Viewpoint: Electrons Film Phonon Dynamics in Full

An electron-scattering technique with femtosecond resolution can probe the real-time dynamics of all phonon modes of a material. Read More »

Synopsis: Metamaterials Could Produce Flying Doughnuts
Optics

Synopsis: Metamaterials Could Produce Flying Doughnuts

A proposed scheme for generating torus-shaped light pulses called flying doughnuts utilizes a metamaterial “sprinkled” with tiny resonators in a concentric ring pattern. Read More »

More Articles