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4096-Emitter Phased Array Lets Chips Steer Light

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CAMBRIDGE, Mass., Jan. 10, 2013 — An array of 4096 optical antennas built on a single silicon chip can steer light in arbitrary directions, holding promise for applications such as holographic televisions and medical imaging devices that can be threaded through tiny blood vessels, among others. Although the concept of such “phased arrays” of antennas goes back more than a century for radio transmitters, scientists recently have been applying this model to optics. Optical wavelengths are much smaller than radio wavelengths, so the antennas have to be fabricated with high accuracy at the nanometer scale. No...Read full article

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    Published: January 2013
    Glossary
    nano
    An SI prefix meaning one billionth (10-9). Nano can also be used to indicate the study of atoms, molecules and other structures and particles on the nanometer scale. Nano-optics (also referred to as nanophotonics), for example, is the study of how light and light-matter interactions behave on the nanometer scale. See nanophotonics.
    Americasbeam steeringBiophotonicsCornell UniversityJie SunMichael WattsMichal LipsonMITnanooptical antennasOpticsphased array antennasResearch & TechnologyResearch Laboratory of ElectronicsRLEsilicon chipwaveguides

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