After solving the time-domain Maxwell equations using finite difference calculus, the reflection and transmission of optical narrow-extent pulses (NEPs) by an axially excited cholesteric liquid crystal (CLC) layer was examined. A Lorentzian model was adopted for the permittivity kernel of the CLC. The well-known circular Bragg phenomenon, displayed by CLCs for incident monochromatic plane waves, is shown to correspond in the time domain to a very prominent increase in the primary reflected pulse duration when the spectrum of the NEP covers the Bragg regime of the CLC and the circular polarization state of the carrier wave matches the handedness of the CLC structure.
|Original language||English (US)|
|Number of pages||11|
|State||Published - Dec 1 2000|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Electrical and Electronic Engineering