Bloch oscillations and subwavelength focusing in stacked fishnet metamaterials

TL;DR

This paper introduces stacked fishnet metamaterials capable of steering light and achieving subwavelength focusing in the microwave region, demonstrated through numerical simulations and experimental magnetic field scanning.

Contribution

It presents a novel stacked fishnet design enabling controllable light steering and subwavelength focusing, with tunable geometrical parameters for effective media manipulation.

Findings

Achieved optical Bloch oscillations in the microwave region.

Demonstrated subwavelength focusing down to one sixth of a wavelength.

Verified focusing effect through direct magnetic field scanning.

Abstract

In this letter, we introduce stacked fishnet metamaterial for steering light in microwave region. We numerically demonstrate that optical Bloch oscillations and a focus of as small as one sixth of a wavelength can be achieved. The flexibility of varying geometrical parameters of the fishnet slabs provides an efficient way for tuning its local effective media parameters and opens the possibility for controlling light arbitrarily. The experiment verifies subwavelength-sized light focusing effect by scanning magnetic field at the surface of the sample directly.