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We show that two-dimensional arrays of thin metallic wires can guidetransverse electromagnetic (TEM) waves and focus them to the spatial dimensionsmuch smaller that the vacuum wavelength. This guiding property is retained forthe tapered wire bundles which can be used as multi-channel TEM endoscopes:they capture a detailed electromagnetic field profile created by deeplysub-wavelength features of the studied sample and magnify it for observation.The resulting imaging method is superior to the conventional scanningmicroscopy because of the parallel nature of the image acquisition by multiplemetal wires. Possible applications include terahertz and mid-infrared endoscopywith nanoscale resolution.Comment: 3 figure

Guiding, Focusing, and Sensing on the Subwavelength Scale Using Metallic Wire Arrays