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optoelectronic world

we can induce nonlinear behavior,” he said. “ e use of these large-scale diode arrays gives us the exibility we need to test and further develop our models, yet on a scale easily constructed by humans. e microwaves are of longer wavelength and the lattice is bigger, but the physics and mathematics are exactly the same as for visible light,” he said.

One of the possible applications of tunable metamaterials is in “secret” communications—the coil absorbs the frequencies used in a communications system, said Shadrivov, making it impossible for outsiders to listen in.

e head of the Nonlinear Physics Center, Prof Yuri Kivshar, who initiated the rst studies of metamaterials in Australia several years ago and put forward the novel concept of nonlinear tunable metamaterials, outlined some of the novel properties of le - handed metamaterials his group has revealed. In particular, a few years ago the group predicted theoretically that a one-dimensional periodic structure containing layers made of a le -hand- ed metamaterial can trap light in three dimensions due to the existence of a complete photonic bandgap. ³ “ is is in sharp contrast with the fundamental concepts of the conventional physics of photonic crystals where complex structures with two- or three-dimensional periodicity are required,” Kivshar said.

Kivshar believes those ndings point to future applications of metamaterials for microwaves, terahertz frequencies, and visible light as fabrication technologies become available. In particular, using the properties of nonlinear metamaterials the team aims to demonstrate experimentally the tunable cloaking effect that would allow at-will control of an object’s visibility.

Paul Grad

REFERENCES

1. I.V. Shadrivov, Appl. Phys. Lett. 90, 201919

(2007). 2. D.A. Powell, I.V. Shadrivov, Yu S Kivshar, M

V Gorkunov, Appl. Phys. Lett. 91, 144107

(2007). 3. I.V. Shadrivov, A. A. Sukhorukov, and Yu.S.

Kivshar, Phys. Rev. Lett. 95, 193903 (2005).

Paul Grad is a freelance writer based in Sydney, Australia; e-mail: gradpaul@hotmail.com.