  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.
