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Light May Control Future MEMS

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RIVERSIDE, Calif., June 1, 2007 -- A beam of light has been used to change the weak attraction between close objects, making the remote operation of micromachines a possibility. A research team led by Umar Mohideen, a physicist and physics professor at the University of California, Riverside, demonstrated in the laboratory that the Casimir force -- the small attractive force that acts between two close parallel uncharged conducting plates -- can be changed using a beam of light, which could lead to the remote operation of micromachines. The Casimir force results when the properties of “virtual photons” are modified....Read full article

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    Published: June 2007
    Glossary
    casimir force
    The Casimir force is a quantum phenomenon that results in an attractive force between two closely spaced uncharged conductive surfaces. This force arises from the quantum vacuum fluctuations of the electromagnetic field between the surfaces. The Casimir effect was first predicted by Dutch physicist Hendrik Casimir in 1948 and has since been experimentally observed, providing a remarkable confirmation of quantum field theory. Key points about the Casimir force: Quantum vacuum fluctuations:...
    electron
    A charged elementary particle of an atom; the term is most commonly used in reference to the negatively charged particle called a negatron. Its mass at rest is me = 9.109558 x 10-31 kg, its charge is 1.6021917 x 10-19 C, and its spin quantum number is 1/2. Its positive counterpart is called a positron, and possesses the same characteristics, except for the reversal of the charge.
    light
    Electromagnetic radiation detectable by the eye, ranging in wavelength from about 400 to 750 nm. In photonic applications light can be considered to cover the nonvisible portion of the spectrum which includes the ultraviolet and the infrared.
    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.
    photon
    A quantum of electromagnetic energy of a single mode; i.e., a single wavelength, direction and polarization. As a unit of energy, each photon equals hn, h being Planck's constant and n, the frequency of the propagating electromagnetic wave. The momentum of the photon in the direction of propagation is hn/c, c being the speed of light.
    photonics
    The technology of generating and harnessing light and other forms of radiant energy whose quantum unit is the photon. The science includes light emission, transmission, deflection, amplification and detection by optical components and instruments, lasers and other light sources, fiber optics, electro-optical instrumentation, related hardware and electronics, and sophisticated systems. The range of applications of photonics extends from energy generation to detection to communications and...
    Biophotonicscarrier densityCasimir forceelectronfiber opticsforcegold ballLifshitzLifshitz theorylightmicromachinenanoNews & FeaturesphotonphotonicssemiconductorsSensors & Detectorssilicon plateUCRUmar Mohideenvirtual photon

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