Physics Today June 2004

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June 2004: Cover: Microwaves with frequencies near 10 GHz see this three−dimensional array of copper wires and split rings as having an electric permittivity and a magnetic permeability that are both negative. The array, whose lattice constant is 2.68 mm, thus has a negative index of refraction. To learn about the curious behavior of negative−index materials, turn to the article by John Pendry and David Smith on page 37. (Photo courtesy of Minas Tanielian, Boeing Phantom Works.)

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$Picture shows a material designed to create negative refraction$
Reversing Light With Negative Refraction	Scholars Probe Nanotechnology's Promise and Its Potential Problems	Decoding the Science of Synchronization


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Reversing Light With Negative Refraction

Materials engineered to have negative permittivity and permeability demonstrate exotic behavior, from a negative refractive index to subwavelength focusing.

Gravitational Lenses

The bending of light reveals information about dark energy, dark matter, and black holes .

A Conversation About Solid−State Physics

Hans Bethe reminisces about the first applications of quantum mechanics to the theory of solids in the late 1920s and early 1930s

High-Redshift Supernovae Reveal an Epoch When Cosmic Expansion Was Slowing Down

The Hubble Space Telescope has provided a harvest of supernovae that exploded when the universe was less than half its present linear size.

Bending Nature's Rules to Pattern Nanostructures on Sticky Surfaces

Researchers form patterned nanowires by adapting a versatile technique used to self-assemble clusters on surfaces.

Is Sedna's Strange Orbit the Shape of Things to Come?

A newly discovered distant minor planet may provide clues about the Sun's early environment.

Lampreys Rely on a Molecular Switch to Detect UV Light

By applying a combination of biochemical and biophysical techniques, researchers have identified a UV-sensitive photoreceptor in the pineal gland of the Japanese river lamprey.