On widening the angular existence domain for Dyakonov surface waves   using the Pockels effect
  The propagation of Dyakonov surface waves (DSWs) at the planar interface between an isotropic material and a linear electro-optic birefringent material can be dynamically controlled using the Pockels effect. The range of directions for DSW propagation has been previously found to be rather narrow. By careful choice of various parameters, this range of directions can be increased by more than an order of magnitude. 
S.R. Nelatury, J.A. Polo Jr., and A. Lakhtakia