Electrically Controlled Bragg Resonances of an Ambichiral Electro–optic Structure: Oblique Incidence

The Pockels effect can increase the effective birefringence of ambichiral, electro–optic rejection filters made of materials with a 4̄2m point group symmetry, when a dc electric field is applied parallel to the axis of nonhomogeneity. The reflectances and the transmittances of such an ambichiral structure for obliquely incident plane waves is solvable through a boundary–value problem that is formulated using the frequency– domain Maxwell equations, the constitutive equations that contain the Pockels effect, and standard algebraic techniques for handling 4×4 matrix ordinary differential equations. The Bragg resonance peaks, for different circular–polarized–incidence conditions, blueshift as the angle of incidence increases. These blueshifts are unaffected by the sign of the dc electric field. c © Anita Publications. All rights reserved.