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On-chip lamp scores a bull's-eye

Etching a series of concentric ridges around the lamp-on-a-chip known as a light-emitting diode, or LED, flings forward light that otherwise would be lost to the sides or back of the device. The ridges boost an LED's brightness seven-fold compared with the same LED without the ridges, Mark Y. Su and Richard P. Mirin, both of the National Institute of Standards and Technology in Boulder, Colo., report in the July 17 Applied Physics Letters.

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