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JILA Upgrades Terahertz Source

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GAITHERSBURG, Md., Jan. 24, 2011 — JILA researchers have developed a laser-based source of terahertz radiation that is unusually efficient and less prone to damage than similar systems. The technology might be useful in applications such as detecting trace gases or imaging weapons in security screening. JILA is a joint institute of the National Institute of Standards and Technology (NIST) and the University of Colorado at Boulder. Close-up of the electron source. (Images: Zhang/JILA) Terahertz radiation — which falls between the radio and optical bands of the electromagnetic spectrum — penetrates...Read full article

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    Published: January 2011
    Glossary
    doping
    The addition of impurities to another substance, usually solid, in a controlled manner that produces desired properties. Silicon doping with small amounts of other semimetallic elements increases the number of electrical carriers.
    field
    1. In raster scan television, one of the two scans that are interlaced to make up a frame. 2. See field of view.
    microscope
    An instrument consisting essentially of a tube 160 mm long, with an objective lens at the distant end and an eyepiece at the near end. The objective forms a real aerial image of the object in the focal plane of the eyepiece where it is observed by the eye. The overall magnifying power is equal to the linear magnification of the objective multiplied by the magnifying power of the eyepiece. The eyepiece can be replaced by a film to photograph the primary image, or a positive or negative relay...
    near-infrared
    The shortest wavelengths of the infrared region, nominally 0.75 to 3 µm.
    optical
    Pertaining to optics and the phenomena of light.
    radiation
    The emission and/or propagation of energy through space or through a medium in the form of either waves or corpuscular emission.
    spectrum
    See optical spectrum; visible spectrum.
    surface
    1. In optics, one of the exterior faces of an optical element. 2. The process of grinding or generating the face of an optical element.
    terahertz
    Terahertz (THz) refers to a unit of frequency in the electromagnetic spectrum, denoting waves with frequencies between 0.1 and 10 terahertz. One terahertz is equivalent to one trillion hertz, or cycles per second. The terahertz frequency range falls between the microwave and infrared regions of the electromagnetic spectrum. Key points about terahertz include: Frequency range: The terahertz range spans from approximately 0.1 terahertz (100 gigahertz) to 10 terahertz. This corresponds to...
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