Non-Reciprocal Hyperbolic Propagation over Moving Metasurfaces

TL;DR

This paper demonstrates that moving homogeneous metasurfaces can support one-way hyperbolic wave propagation, introducing non-reciprocity in nanophotonics without the drawbacks of nonlocal effects or material modulation.

Contribution

It reveals that motion of homogeneous metasurfaces induces non-reciprocal hyperbolic propagation, a novel approach differing from traditional conductivity modulation methods.

Findings

Moving metasurfaces support one-way hyperbolic propagation.

Non-reciprocity is achieved without material inhomogeneity.

No nonlocal effects from discretization or granularity.

Abstract

Hyperbolic propagation offers exciting opportunities in nanophotonics, from sub-diffraction imaging to enhanced local density of states. This transport regime is typically induced by strong modulation of conductivity, i.e., with alternating metallic and dielectric material properties. Here, we analyze a moving impedance surface, showing that suitably tailored homogeneous metasurfaces can support one-way hyperbolic propagation when in motion, adding non-reciprocity to hyperbolic propagation phenomena, and without suffering from nonlocal effects stemming from discretization or finite granularity of the surface.