Abstract
A silver film-based superlens, a plasmonic microzone plate, is put forth for the purpose of superfocusing at visible regime. The numerical analysis results reveal that it has unique focusing characteristics of longer focal length and depth of focus with resolving power beyond diffraction limit in comparison to the conventional zone plates. Working at near field, it increases working distance l at near field from l<λ∕10 to l≈λ∼5λ. This feature makes it a promising superlens to be used as a probe for the optical systems with high resolution imaging and detection as well as feedback control system immune for autofocusing.
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