Chiral Fiber Gratings Polarize Liqht

Chiral photonic devices have a screwlike, or helical, microstructure with a period comparable to the optical wavelength, which enables them to control or manipulate light. Chiral fiber gratings are produced by twisting fiber with a noncircular fiber core as it passes through a miniature oven.' These structures occur naturally in rightor left-handed forms, depending on the direction of twist. Because they do not have mirror symmetry, they interact differently with right and left circularly polarized light.