Wavelength-tunable superresolution imaging with a ferrite superlens

Abstract

We theoretically propose a system capable of wavelength-tunable sub-diffraction-limited imaging by a single planar magnetic superlens, which is made of [Formula: see text]-negative ferrite material (MNM) slab. Our theoretical and numerical simulation results demonstrate that the working wavelength of this planar superlens can be well tuned with the external magnetic field since the permeability of ferrite material LuBiIG is adjusted by the applied magnetic field. The resolution of the magnetic superlens with 300 [Formula: see text]m thickness LuBiIG film is smaller than [Formula: see text]/20, and the resolution is higher with thinner film. It may provide a potential way to design a wavelength-tunable magnetic superlens with the single layer of ferrite thin film material.