Reconfigurable topological states in arrays of bianisotropic particles

TL;DR

This paper demonstrates a reconfigurable topological photonic system using arrays of bianisotropic dielectric particles, enabling flexible control of topological states through particle orientation, with experimental validation of reconfigurability.

Contribution

It introduces a novel design of a topological array with reconfigurable states achieved by particle orientation, advancing flexible topological photonic devices.

Findings

Reconfigurable topological states achieved via particle rotation.

Experimental validation with ceramic horseshoe-shaped disks.

Topological interface states can be tailored in a one-dimensional array.

Abstract

Topological photonics promotes a novel approach to resilient light manipulation by exploiting spatio-temporal symmetries of the system and dual symmetry of electromagnetic field. Various prospective device applications pose the need to flexibly control robust field localization associated with topological modes. Here we design a topological array of resonant dielectric meta-atoms with bianisotropic response induced by a spatial symmetry reduction. Mutual orientation of the designed meta-atoms encodes a staggered bianisotropy pattern capable of trapping topological states in a one-dimensional array containing a small number of particles. We show that the topological interface state can be tailored by the rotation of coaxial bianisotropic particles arranged in an equidistant lattice. Our experimental implementation based on ceramic horseshoe-shaped disks demonstrates remarkable reconfigurability of electromagnetic topological states.