Premium
Swamping of circular Bragg phenomenon and shaping of videopulses
Author(s) -
Geddes Joseph B.,
Lakhtakia Akhlesh
Publication year - 2007
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.22290
Subject(s) - wavelength , nonlinear system , microwave , optics , polarization (electrochemistry) , permittivity , circular polarization , bandwidth (computing) , materials science , physics , optoelectronics , dielectric , telecommunications , chemistry , engineering , quantum mechanics , microstrip
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 nonlinear case. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 776–779, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22290