Overcoming the diffraction limit with a planar left-handed transmission-line lens.

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Realization of optical superlens imaging below the diffraction limit (2005, background): “Unprecedented electromagnetic properties of artificial metamaterials in the microwave and terahertz (THz) regime have been demonstrated [5]–[ 14 ].”
Higher order asymptotic homogenization and wave propagation in periodic composite materials (2008, methodology): “In particular, they are used in the construction of superlenses providing resolution several times better than the diffraction limit (Pendry 2000; Grbic & Eleftheriades 2004).”
Metamaterials in the Terahertz Regime (2009, background): “As an example, superlenses, which are able to amplify evanescent waves via exploitation of negative refractive index, have become a flagship application of metamaterials that attracts much interest in the radio [112], microwave [ 113 ]–[115], and optical [20], [116], [117] regimes.”
A Printed, Broadband Luneburg Lens Antenna (2010, result): “To verify that the fabricated Luneburg lens was working as expected, the vertical electric field directly above the lens was probed in a similar manner to [15].”