Xiang Ni

TL;DR: It is demonstrated theoretically and experimentally that 3D-printed two-dimensional acoustic meta-structures can possess nontrivial bulk topological polarization and host one-dimensional edge and Wannier-type second-order zero-dimensional corner states with unique acoustic properties, and offer possibilities for advanced control of the propagation and manipulation of sound, including within the radiative continuum.

TL;DR: Robust propagation along reconfigurable pathways defined by synthetic gauge fields within a topological photonic metacrystal domains is demonstrated and provides a framework for freely steering electromagnetic radiation within photonic structures.

TL;DR: In this article, a photonic higher-order topological insulator (HOTI) with kagome lattice exhibits topological bulk polarization, leading to the emergence of one-dimensional edge states, as well as higherorder zero-dimensional states confined to the corners of the structure.

TL;DR: In this article, a 3D photonic topological metacrystal based on an all-dielectric metamaterial platform shows robust propagation of surface states along 2D domain walls, making it a promising solution for photonics applications.

TL;DR: The results demonstrate how the topological states of open non-Hermitian systems can be explored via far-field measurements, thus paving a way to the design of metasurfaces with unique scattering characteristics controlled via topological effects.