title: Metal-dielectric composites for beam splitting and far-field deep sub-wavelength resolution for visible wavelengths.
abstract: We report beam splitting in a metamaterial composed of a silver-alumina composite covered by a layer of chromium containing one slit. By simulating distributions of energy flow in the metamaterial for H-polarized waves, we find that the beam splitting occurs when the width of the slit is shorter than the wavelength, which is conducive to making a beam splitter in sub-wavelength photonic devices. We also find that the metamaterial possesses deep sub-wavelength resolution capabilities in the far field when there are two slits and the central silver layer is at least 36 nm in thickness, which has potential applications in superresolution imaging.
authors.affiliation: School of Electrical and Electronic Engineering, Nanyang Technological University, 639798, Singapore.
authors.forename: Changchun
authors.initials: C
authors.lastname: Yan
authors.forename: Dao Hua
authors.initials: DH
authors.lastname: Zhang
authors.forename: Yuan
authors.initials: Y
authors.lastname: Zhang
authors.forename: Dongdong
authors.initials: D
authors.lastname: Li
authors.forename: M A
authors.initials: MA
authors.lastname: Fiddy