Europhys. Lett, 48 (2), pp. 177-181 (1999)
Point of ultra-sensitivity to perturbations for axial propagation in helicoidal bianisotropic structures
KLA-Tencor Corporation-4 Science Avenue, P.O.Box143, MigdalHaemek23100,Israel
(received 26 May 1999; accepted 26 August 1999)
PACS. 61.30 - Liquid crystals.
PACS. 42.70 - Optical materials.
PACS. 78.20Ci - Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity).
It is shown that under a certain condition the optical properties of helicoidal bianisotropic structures for propagation along the helix exhibit drastic 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.
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