Superlens imaging theory for anisotropic nanostructured metamaterials with broadband all-angle negative refraction

TL;DR

This paper develops a theoretical framework for superlens imaging using anisotropic nanostructured metamaterials with broadband all-angle negative refraction, based on aligned metallic nanowires exhibiting surface plasmon resonances.

Contribution

It introduces a new imaging theory for anisotropic nanowire metamaterials enabling broadband negative refraction and superlens imaging across a wide frequency range.

Findings

Metamaterials with aligned metallic nanowires exhibit two surface plasmon resonances.

Achieves broadband all-angle negative refraction for wavelengths beyond the longitudinal SPR.

Designs high-performance superlens systems from infrared to ultraviolet frequencies.

Abstract

We show that a metamaterial consisting of aligned metallic nanowires in a dielectric matrix has strongly anisotropic optical properties. For filling ratio f<1/2, the composite medium shows two surface plasmon resonances (SPRs): the transverse and longitudinal SPR with wavelengths lambda_t<lambda_l. For lambda>lambda_l, the longitudinal SPR, the material exhibits Re epsilon_l<0, Re epsilon_t>0, relative to the nanowires axis, enabling the achievement of broadband all-angle negative refraction and superlens imaging. An imaging theory of superlens made of these media is established. High performance systems made with Au, Ag or Al nanowires in nanoporous templates are designed and predicted to work from the infrared up to ultraviolet frequencies.