By means of the angular spectrum representation of wave fields, a discussion is given on the propagation and restoration of the wave-front structure in a slab of a left-handed medium (or negative-index medium) whose surface impedance matches that of vacuum, namely, one whose effective optical parameters are n = ε = μ = −1. This restoration was previously discussed [Phys. Rev. Lett. 85, 3866 (2000)] in regard to whether it may yield superresolved images. The divergence of the wave field in the slab, and its equivalence with that of the inverse diffraction propagator in free space, is addressed. Further, the existence of absorption, its regularization of this divergence, and the trade-off of a resulting limited superresolution are analyzed in detail in terms of its effect on the evanescent components of the wave field and hence on the transfer function width.
© 2004 Optical Society of America
(070.2580) Fourier optics and signal processing : Paraxial wave optics
(100.3020) Image processing : Image reconstruction-restoration
(110.2990) Imaging systems : Image formation theory
(220.3630) Optical design and fabrication : Lenses
(350.4010) Other areas of optics : Microwaves
Manuel Nieto-Vesperinas, "Problem of image superresolution with a negative-refractive-index slab," J. Opt. Soc. Am. A 21, 491-498 (2004)