Canalization of subwavelength images by electromagnetic crystals

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Dynamic Mass Density and Acoustic Metamaterials (2007, background): “Highly dispersive materials can attain almost flat equi-frequency contours within a certain regime, thereby “canalizes” the propagation of wave [44, 45], achieving imaging effect.”
Applications of Hyperbolic Metamaterial Substrates (2012, methodology): “Both these approaches achieve the desired extremely anisotropic response according to Maxwell-Garnett effective medium theory [16, 37–40].”
A holey-structured metamaterial for acoustic deep-subwavelength imaging (2011, methodology): “The physics behind the behaviour of the holey-structured metamaterial is similar to the so-called canalization phenomeno”
Quantum nanophotonics using hyperbolic metamaterials (2012, background): “Near the plasmon resonance of the multilayer structure xx → 0 and zz → −∞, however, this is not the optimum functional wavelength due to losses and the large impedance mismatch with surrounding media [51, 52].”