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A new type of nanometer-size semiconductor crystal that can amplify light marks an important step toward cheap, tunable lasers.
A nanowire grid could help make large organic LED displays practical.
Solar cells, camera lenses, and LEDs could benefit from new antireflection coatings.
Adding decoy photons to quantum-cryptographic signals should finally make them “unconditionally secure.”
Long-lasting near-infrared LEDs could be used to make cheap, flexible night-vision displays and sensors.