Swamping of circular BRAGG phenomenon and shaping of videopulses

Joseph B. Geddes, Akhlesh Lakhtakia

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


We studied the durations and average speeds of videopulses transmitted through chiral sculptured thin films using a finite-difference algorithm. The chiral STF was either linear or possessed an intensity-dependent permittivity. Videopulse durations tended to decrease with increasing carrier wavelength and to increase, for given carrier wavelength and polarization state, when the chiral STF was nonlinear with intensity-dependent permittivity. The rate of decrease in durations with wavelength was less than that for longer-duration pulses. The effect of the circular Bragg phenomenon was swamped by the wide bandwidth possessed by videopulses. Two measures of videopulse average speed did not change much with carrier wavelength, and decreased slightly for a given carrier wavelength and polarization state in the nonlinear case. The other measure of average speed tended to increase with increasing carrier wavelength, and decrease for a given carrier wavelength and polarization state in the nonlin ear case.

Original languageEnglish (US)
Pages (from-to)776-779
Number of pages4
JournalMicrowave and Optical Technology Letters
Issue number4
StatePublished - Apr 2007

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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