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Deposition Sciences Inc. - Difficult Coatings - LB - 8/23

Material Gives Visible Light an Infinite Wavelength

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A new metamaterial made from stacks of silver and silicon nitride nanolayers gives visible light a nearly infinite wavelength, an international team reports. The material could be used to make novel optical components or more efficient LEDs. Light’s phase velocity (how the peaks and valleys of the wave move) and group velocity (the transport of energy) dictate how it propagates in a material. Energy transport is limited to the speed of light, according to Einstein’s laws, but there are no physical limitations on the phase velocity. When it reaches zero, meaning there is no...Read full article

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    Published: October 2013
    Glossary
    group velocity
    For a particular mode, the reciprocal of the rate of change of the phase constant with respect to angular frequency.
    metamaterial
    Metamaterials are artificial materials engineered to have properties not found in naturally occurring substances. These materials are designed to manipulate electromagnetic waves in ways that are not possible with conventional materials. Metamaterials typically consist of structures or elements that are smaller than the wavelength of the waves they interact with. Key characteristics of metamaterials include: Negative refraction index: One of the most notable features of certain...
    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.
    phase velocity
    For a particular mode in a waveguide, the ratio of the angular frequency to constant phase.
    AmericasAMOLFENZepsilon near zeroEuropeFOMgroup velocityLight SourcesMaterials & ChemicalsmetamaterialnanonanolithographynanoscaleNature PhotonicsNetherlandsOpticsPennsylvaniapermittivityphase velocitypropagationResearch & TechnologyTech PulseUniversity of Pennsylvaniavisible lightLEDs

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