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Active Cloak Most Broadband to Date

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An active invisibility cloak — that is, one designed to work with an external power source — could significantly broaden the device's operation bandwidth, moving its applications beyond camouflage. A team at the University of Texas at Austin led by Andrea Alù, associate professor at the Cockrell School of Engineering, proposed a design for an active cloak that draws energy from a battery, allowing objects to become undetectable to radio sensors over a greater range of frequencies. That would give the proposed active cloak a number of new applications, such as...Read full article

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    Published: December 2013
    Glossary
    broadband
    Indicating a capability to deal with a relatively wide spectral bandwidth.
    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...
    active cloakAmericasAndrea AlùBiophotonicsbroadbandcloakingCommunicationsFosters theoremHarry PotterImaginginvisibility cloakmetamaterialmetasurfacepassive cloakResearch & TechnologySensors & DetectorsTech Pulse

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