Plasmonic topological metasurface by encircling an exceptional point

TLDR

Modulated‑phase metasurfaces enable compact optical devices, and as open systems interacting with their environment, they exhibit non‑Hermitian behavior. Song et al. designed a metasurface that exploits non‑Hermitian properties to encircle an exceptional point. Scattering from the exceptional point is polarization‑dependent, offering an extra control knob for wave‑front engineering.

Abstract

Upon reflection, modulate phase Metasurfaces provide a platform to fabricate optical devices in a compact form much thinner than their corresponding bulk optical components. Recognizing that metasurfaces are also open systems interacting with their environment, Song et al . designed a metasurface that exploits those non-Hermitian properties such that they can encircle an exceptional point. Subsequent scattering from such an exceptional point was shown to be polarization dependent, thus providing an additional control knob in designing metasurfaces for wave front engineering. —ISO