Blue laser race turns red-hot

Article Abstract:

Researchers at Nichia Chemical Industries report development of the first electrically powered laser from a gallium nitride (GaN) alloy. The GaN laser is more durable than the rival zinc-selenide (ZnSe) technology and has the advantage of already being used in light-emitting diodes.

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Mixing nanotube structures to make a tiny switch

Article Abstract:

Two research teams have developed models of nanotube switches. A hollow cylinder of carbon atoms acts like a semiconductor at one end, while the other end behaves like a metal. A heterojunction - a gatelike junction that controls electron flow - separates the ends.

Molecular electronics, Semiconductor switches

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Small clusters hit the big time

Article Abstract:

New techniques for making clusters of atoms pave the way for many hi-tech applications, including semiconductor lasers and polycrystalline thin films. The development of the quantum dot laser is described.

Cover Story, Semiconductors

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