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      A positive future for double-negative metamaterials

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          Composite Medium with Simultaneously Negative Permeability and Permittivity

          We demonstrate a composite medium, based on a periodic array of interspaced conducting nonmagnetic split ring resonators and continuous wires, that exhibits a frequency region in the microwave regime with simultaneously negative values of effective permeability &mgr;(eff)(omega) and permittivity varepsilon(eff)(omega). This structure forms a "left-handed" medium, for which it has been predicted that such phenomena as the Doppler effect, Cherenkov radiation, and even Snell's law are inverted. It is now possible through microwave experiments to test for these effects using this new metamaterial.
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            Negative refraction makes a perfect lens

            With a conventional lens sharpness of the image is always limited by the wavelength of light. An unconventional alternative to a lens, a slab of negative refractive index material, has the power to focus all Fourier components of a 2D image, even those that do not propagate in a radiative manner. Such "superlenses" can be realized in the microwave band with current technology. Our simulations show that a version of the lens operating at the frequency of visible light can be realized in the form of a thin slab of silver. This optical version resolves objects only a few nanometers across.
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              High-impedance electromagnetic surfaces with a forbidden frequency band

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                Author and article information

                Journal
                IEEE Transactions on Microwave Theory and Techniques
                IEEE Trans. Microwave Theory Techn.
                Institute of Electrical and Electronics Engineers (IEEE)
                0018-9480
                April 2005
                April 2005
                : 53
                : 4
                : 1535-1556
                Article
                10.1109/TMTT.2005.845188
                a6360ca4-afbb-4e9b-b07e-ce4ad6140b13
                © 2005
                History

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