I. Abdulhalim, Point of ultra-sensitivity to perturbations for axial propagation in helicoidal bianisotropic structures, EUROPH LETT, 48(2), 1999, pp. 177-181
It is shown that under a certain condition the optical properties of helico
idal bianisotropic structures for propagation along the helix exhibit drast
ic changes. An inhibition of the Bragg reflection occurs and the structure
behaves optically as an isotropic medium. A very small perturbation to the
structure can then induce a strong optical effect.