Truncation of Angular Spread of Bragg Zones by Total Reflection, and Goos-Hanchen Shifts Exhibited by Chiral Sculptured Thin Films

摘要

The total-reflection phenomenon is shown to restrict the angular spread of the Bragg phenomenon, when a plane wave is incident on a chiral sculptured thin film (STF) from an optically denser medium. Unlike the Bragg phenomenon, the total-reflection phenomenon is insensitive to the structural handedness of the chiral STF. Mechanically tunable Goos-Hanchen shifts that are appreciable fractions of the wavelength are experienced by beams of finite transverse extent, in the total-reflection regime.