The reflectances and transmittances of light incident normally on a chiral sculptured thin film with a periodically modulated tilt angle are calculated using the piecewise homogeneity approximation method. The necessary concurrent modulation of the local permittivity dyadic are accounted for by using empirically determined parameters. For modulation lengths equal to half the unmodulated structural period of the film, the circular Bragg phenomenon displayed by unmodulated chiral STFs is destroyed. It is demonstrated that the chosen nanomaterial then acts as a conventional dielectric mirror.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Physical and Theoretical Chemistry
- Electrical and Electronic Engineering