Complete asymmetric polarization conversion at zero-eigenvalue exceptional points of non-Hermitian metasurfaces.

ABSTRACT: Non-Hermitian systems can be tuned to exhibit exceptional points, where both eigenvalues and eigenstates coalesce concurrently. The inherent adaptability of photonic non-Hermitian systems in configuring gain and loss has allowed us to observe a plethora of counterintuitive phenomena, largely as a consequence of the eigenspace reduction at these exceptional points. In this work, we propose a non-Hermitian metasurface that, through the incorporation of gain, enables complete asymmetric polarization conversion at an exceptional point with a zero eigenvalue. Specifically, we provide numerical evidence for this concept by designing a non-Hermitian metasurface that facilitates polarization conversion from right to left circular polarization, while preventing conversion in the reverse direction a

SUBMITTER: Oh D 

PROVIDER: S-EPMC11636506 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature