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Meadowlark Optics - Wave Plates 6/24 LB 2024

Crystals Key to Cloaking

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CHAMPAIGN, Ill., June 30, 2008 -- Concentric rings of silicon photonic crystals have, in computer simulations, demonstrated an approximate cloaking effect, bringing scientists a step closer to making optical cloaking -- invisibility -- more practical. "This is much more than a theoretical exercise," said Harley Johnson, a Cannon Faculty Scholar and professor of mechanical science and engineering at the University of Illinois. "An optical cloaking device is almost within reach." Harley Johnson, left, a mechanical science and engineering professor at the University of Illinois, and Dong Xiao, a postdoctoral researcher,...Read full article

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    Published: June 2008
    Glossary
    concentric
    Characterized by having the same center. Concentric circles differ in radius but have a common center point.
    dielectric
    Exhibiting the characteristic of materials that are electrical insulators or in which an electric field can be sustained with a minimum dispersion of power. They exhibit nonlinear properties, such as anisotropy of conductivity or polarization, or saturation phenomena.
    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.
    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...
    wavelength
    Electromagnetic energy is transmitted in the form of a sinusoidal wave. The wavelength is the physical distance covered by one cycle of this wave; it is inversely proportional to frequency.
    Basic SciencecloakconcentricdielectricDong XiaoDuke UniversityHarley JohnsonImperial CollegeinvisibilitylightNews & Featuresoptical cloakingphotonic cystalsphotonicsSensors & DetectorssiliconUniversity of Illinoiswavelength

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