Analytical solution of the almost-perfect-lens problem

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On the cloaking effects associated with anomalous localized resonance (2006, background): “Contrary to the conventional picture, the field also has enormous oscillations in front of the lens as shown by Podolskiy et al. (2005) and these fields are the ones responsible for cloaking (see also Rao & Ong (2003), Shvets (2003), Merlin (2004) and Guenneau et al.”
Photonic Metamaterials: Magnetism at Optical Frequencies (2006, background): “Accounting for the “granularity” of the metamaterials and deviations from the strict case of n = −1 due to the real [30] and/or the imaginary [31] part of n, however, limits the performance of the “perfect lens.”
A proof of superlensing in the quasistatic regime, and limitations of superlenses in this regime due to anomalous localized resonance (2005, methodology): “This was anticipated from the work of Merlin (2004) who takes msZK1 and 3sZK1Cs, with s being real and l0/d being arbitrary and finds surface waves on both sides of the slab with the amplitude of the waves near each surface growing as jsjK1/2.”
Recent advances in planar optics: from plasmonic to dielectric metasurfaces (2017, background): “However, the former method has strong limitations because any, even minimal, optical losses or/and very small imbalances between positive and negative optical space bring the lens back to the diffraction limit [114,115].”