圆布拉格现象的淹没与视频脉冲的整形
Swamping of circular Bragg phenomenon and shaping of videopulses
摘要：
利用有限差分算法研究了视频脉冲通过手征性雕刻薄膜的持续时间和平均速率。手性STF是线性的或具有强度依赖的介电常数。当手征STF为非线性且介电常数随强度变化时，视频脉冲持续时间随载波波长的增加而减小，而对于给定的载波波长和偏振态，视频脉冲持续时间则随载波波长的增加而增加。持续时间与波长的下降率小于较长持续时间的脉冲。环形布拉格现象的影响被视频脉冲所拥有的宽带宽所淹没。在非线性情况下，对于给定的载波波长和偏振态，两种视频脉冲平均速率的测量值随载波波长变化不大，而略有下降。在非线性情况下，平均速率的另一个测量值随着载波波长的增加而增加，而对于给定的载波波长和偏振态，则减小。
英文摘要：
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.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
