Specialty Optical Fibers Handbook

thermocouple. A right- or left-handed structure is produced depending

on the sense of the twisting motor rotation. This flexible fabrication approach

produces a stable structure that has double-helix symmetry in the case of

twisted concentric birefringent fibers or single-helix symmetry in the case

of twisted nonconcentric fibers.

High-contrast chiral gratings can be implemented in a broad range of glass

materials free of the constraint that these be photosensitive. In double-helix

structures, resonance interactions only occur for co-handed circularly polarized

light with the same handedness as the structure, whereas in single-helix structures

with