Abstract
Optical transfer function (OTF) and image spectrums of the layered metal (M)–dielectric (D) superlenses (MD) n (where n is the number of cycles) are analyzed via transfer matrix method and effective-medium model. It is shown that the magnitude of OTF (MTF) with a high cutoff wave vector does not guarantee high resolution; the fluctuation of phase of OTF (PTF) is also a prime factor causing superlens imaging distortion. When the layered metal–dielectric superlenses have a small number of cycles, we find that the different types of superlenses (such as (MD) nM, (MD) n, and (DM) nD) with the same effective permittivity have totally different performances; the superlens with (DM) nD arrangement has the best performance; this will be valuable for designing layered metal–dielectric superlenses with less cycles.
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