Time-domain simulation of the circular Bragg phenomenon exhibited by axially excited chiral sculptured thin films

We present simulations of the transmission and reflection of narrow-extent pulses incident upon a chiral sculptured thin film (STF) along its axis of spirality, when the circular Bragg phenomenon is excited. Even though the f requency-domain reflection and transmission spectrums of a sufficiently thi ck chiral STF slab acquire final shapes within the Bragg regime, the shape and the duration of the transmitted pulse change with slab thickness over t he entire range of our simulations. The emergence of a multiple-hump struct ure in the transmitted pulse is relevant to the use of chiral STFs in digit al optics communication.